Friday

May 29, 2015

May 29, 2015

Number of results: 734

**Algebra**

In a lab experiement, there is a culture that contains 25 bacteria at 2:00. At 2:15 there are 50 bacteria, At 3:15 there are 800 bacteria. What is the conjecture about the rate at which the bacteria increase?
*October 3, 2012 by Carol*

**tofu**

does tofu have any naturally occuring bacteria in it? When I incubated the tofu juice, a white bacteria grew, but I can't find any information stating what it might be. It should not have an "natural" bacteria in it. Bacteria are not used in the production process. Tofu is an ...
*December 1, 2006 by Christine*

**genetics/biology**

Bacteria Y has a mutation within it’s genome, at gene R, that provides resistance to neomycin. Bacteria Z is sensitive to neomycin, however, when Bacteria Y is placed in a mixture with Bacteria Z, Bacteria Z also gains neomycin resistance. One cell of Bacterium Y undergoes ...
*November 7, 2008 by bebe*

**genetics/biology**

Bacteria Y has a mutation within it’s genome, at gene R, that provides resistance to neomycin. Bacteria Z is sensitive to neomycin, however, when Bacteria Y is placed in a mixture with Bacteria Z, Bacteria Z also gains neomycin resistance. One cell of Bacterium Y undergoes ...
*November 7, 2008 by bebe*

**College Algebra **

The number of bacteria in a certain culture increased from 500 to 1000 between 7:00 A.M. and 9:00 A.M. Assuming growth is exponential, the number f(t) of bacteria t hours after 7:00 A.M. is given by f(t) = 500(2)^t/2. (a) Estimate the number of bacteria in the culture at 8:00 ...
*December 10, 2014 by Kyle *

**Algebra**

At 8Am population of bacteria is 100,at 10Am population of bacteria is 200,At 12PM population of bacteria is 400,At 2PM population of bacteria is 800.If the pattern continues what will the bacteria population be at 6.00 pm
*August 7, 2014 by Firdous *

**Math**

Bacteria can multiply at an alarming rate when each bacteria splits into two new cells, thus doubling. If we start with only bacteria which can double every hour, how many bacteria will we have by the end of the day?
*April 16, 2015 by M*

**Pre-Calc/Trig...**

is this the correct formula for me to solve this? A bacteria culture has 2,000 bacteria. The number of bacteria increases by 5% each hour. How many bacteria are there after 12 hours? 2,000*0.05^(12-1)
*December 3, 2014 by Anonymous*

**Math**

In a lab experiment, the count of a bacteria doubles every hour. a)at 1pm, there was 23000 bacteria. How many bacteria will be present at midnight? I can't seem to get the correct answer. The answer is 47 104 000 bacteria. Thanks very much in advance!
*January 23, 2013 by A Canadian*

**math**

Bladder infections are often caused when the bacteria E. coli reach the human bladder. Suppose that 3000 of the bacteria are present at time t = 0. Then t minutes later, the number of bacteria present will be a) How many bacteria will be present after 10 minutes? 30 minutes? ...
*March 24, 2014 by Emmanuel*

**precalculus**

A bacteria culture initially contains 1500 bacteria and doubles every half hour. a) Find an expression for the number of bacteria after t hours. Q(t)= b) The number of bacteria after 20 minutes is (the answer must be an integer) c) The number of bacteria after 9 hours is
*March 2, 2011 by josh*

**Chem**

suppose that you place exactly 100 bacteria into a flask containing nutrients for the bacteria and that you find the following data at 37 °C: t (min):0 15.0 30.0 45.0 60.0 Number of bacteria: 100 200 400 800 1600 What is the order of the rate of production of the bacteria? How...
*March 12, 2014 by Bri*

**Calculus**

A colony of bacteria is grown under ideal conditions in a laboratory so that the population increases exponentially with time. At the end of 2 hours, there are 4,800 bacteria. At the end of 4 hours, there are 19,00 bacteria. How many bacteria were present initially?
*January 3, 2013 by Oj*

**Science**

Which of the following is NOT true of bacteria? a. Bacteria change the sugar in milk to lactic acid. b. Bacteria change nitrogen into a form plants can use. c. Bacteria change harmful chemicals into harmless ones. d. Bacteria change oxygen into nitrogen.
*February 1, 2013 by T.J And the Vibe*

**MATH :)**

3. In Biology, it is found that the bacteria in a certain culture double every half-hour. If the initial number of bacteria in culture is 1000, A. Find the defining equation for the number N of bacteria in culture after T hours, assuming that no bacteria die. B. How many ...
*May 4, 2011 by NEED ANSWER URGENT. ANON.*

**Math**

A culture of bacteria in a petri dish is doubling every hour. If there are 100 bacteria at time t=0, how many bacteria will there be in 12 hours?
*November 7, 2010 by Anonymous*

**math**

A type of bacteria reproduces by splitting in two every thirty minutes. How many bacteria will there be after 4 hours if there are 2 bacteria to begin with?
*November 3, 2010 by Kam*

**math**

A type of bacteria reproduces by splitting in two every thirty minutes. How many bacteria will there be after 4 hours if there are 2 bacteria to begin with?
*January 10, 2013 by Nicholas*

** math**

A type of bacteria doubles in number every 12 hours. After 2 days, there are 48 bacteria. How many bacteria were there at the beginning of the first day.
*November 13, 2013 by Taylor*

**Algebra**

(I skipped the lengthy work problem background as it is irrelevant) The number of bacteria needed to break down an oil spill is 1000000 per millitre of oil. The bacteria double in number every two days.The starting concentration of bacteria is 1000 bacteria per millimetre.The ...
*December 31, 2014 by Lucina*

**Calculus**

Suppose bacteria is growing on a pizza that has been taken out of the refrigerator at a rate that is proportional to the number of bacteria. Suppose there were 50 bacteria when the pizza was removed from the refrigerator and one hour later there were 200 bacteria. How many ...
*January 19, 2015 by Ben Klotz*

**Science**

A vaccine can protect you against a disease because it (1)destroys toxic substances from bacteria before they can make you sick\ (2) stimulates your immune system against the pathogens (3) kills any pathogenic bacteria in your body (4) changes pathogenic bacteria into harmless...
*May 2, 2012 by George wang*

**math modeling**

At 3a.m., there is a colony of 736 bacteria, and it is growing at a continuous hourly rate of 10.77%. How many bacteria are there at 7p.m.? Round your answer to the nearest whole number of bacteria.
*October 25, 2011 by math *

**Math**

A certain bacterium divides into 2 bacteria every 20 minutes. If there are four bacteria in the culture now, how many will there be in 4 hours, assuming that no bacteria die?
*March 26, 2012 by Garz*

**Math**

The doubling period of a bacteria culture is 35 minutes and it starts with 1400 bacteria. How many bacteria will there be after 3 hours? Round your answer to the nearest tenth.
*June 10, 2014 by Han*

**math**

Marcus is doing a science experiment in which he measures the rate at which bacteria multiply. Every 15 seconds the bacteria double in number. If there are 10 bacteria now, how many will there be in 2 minutes?
*March 10, 2015 by kyle*

**Health (Ms. Sue)**

Describe how bacteria develop antibiotic diseases. A: Bacteria develop antibiotic resistance when a person stops taking antibiotics before the prescription is finished. By doing this, most of the bacteria die, but some more resistant bacteria survive and multiplies, which can ...
*November 20, 2013 by Anonymous*

**chemistry**

Suppose that you place exactly 100 bacteria into a flask containing nutrients for the bacteria and that you find the following data at 37 °C: TIme (s) number of bacteria 0 100 19 200 38 400 57 800 76 1600 what is the rate order? What is rate constant? how many bacteria will be...
*March 25, 2012 by HELP PLEASE*

**calculus**

2. The rate of change in the number of bacteria in a culture is proportional to the number present. In a certain laboratory experiment, a culture has 10,000 bacterial initially, 20,000 bacteria at time t1 minutes, and 100,000 bacteria at (t1 + 10) minutes. a. In terms of t ...
*March 30, 2012 by naseba*

**precal**

A petri dish contains only two bacteria. The bacteria divide every half hour. How many bacteria will exist after 3 hours? I thought it'd be 12, but apparently not.
*September 2, 2010 by Anonymous*

**pre calculus**

if there are initial 2500 bacteria in a culture, and the number of bacteria double each hour, the number of bacteria after t hours cab n be found using the formula=N=2500(2^t).how long will it take the culture to grow to 75,000 bacteria.
*December 17, 2010 by john*

**Calculus**

Suppose that a population of bacteria triples every hour and starts with 700 bacteria. (a) Find an expression for the number n of bacteria after t hours. n(t) = ? (b) Estimate the rate of growth of the bacteria population after 1.5 hours. (Round your answer to the nearest ...
*November 3, 2009 by Alex*

**biology**

There is a bacteria called botulism which will grow in anaerobic conditions. This bacteria can be found in improperly canned food, as a result a toxin is produced which can be deadly to humans. What does this bacteria have to do with BOTOX?
*August 11, 2010 by peter*

**Physics**

On earth, a certain type of bacteria doubles in number every 24 hours. Two cultures of these bacteria are prepared, each consisting initially of one bacterium. One culture is left on earth and the other is put on a rocket travelling at .866c relative to the earth. By the time ...
*May 25, 2011 by Joe Schmo*

**math**

Katrina is studying the effect of foreign substances on bacteria populations. If she introduces a beneficial substance, such as food, the bacteria population grows. If she introduces a harmful substance, such as a poison, the bacteria population decreases. The function f(x) = ...
*October 30, 2014 by Eric*

**Pre-Calc (exponential growth)**

A COLONY OF BACTERIA IS GROWN UNDER IDEAL CONDITIONS IN A LAB SO THAT THE POPULATION INCREASES EXPONENTIALLY WITH TIME. At the end of the three hours, there are 10,000 bacteria. At the end of the 5 hours, there are 40,000 bacteria. How many bacteria were present initially? I ...
*March 28, 2010 by Phillip*

**Algebra**

A medical researcher wanted to determine the effect of pH (a measure of alkalinity or acidity, with pure water having a pH of 7) on the growth of a bacteria culture. The table below gives the measurements of different cultures, in thousands of bacteria, after 8 hours. pH ...
*December 1, 2014 by Patty*

**Algebra 2**

If there are initially 1500 bacteria in a culture, and the number of bacteria double each hour, the number of bacteria after t hours can be found using the formula N=1500(2^t). How many bacteria will present after 7 hours? I think the answer is N=192,000. Is this correct?
*March 1, 2012 by Emily*

**Algebra**

The number of bacteria in a stagment pond doubles every hour. A farmer sprays it every two hours and kils 3/4 of bacteria immediately. If there are 10,000 live bacteria left after the farmer sprays at noon, how many live bacteria are there at 11 p.m. that night?
*December 12, 2012 by Jenny*

**math**

The number of bacteria in a culture is modeled by: n(t) = 1330e^(0.42t) (a) The initial number of bacteria is: (b) The relative rate of growth of this bacterium population is: (c) The number of bacteria after 3 hours is: (d) After how many hours will the number of bacteria ...
*November 19, 2012 by NotGonnaSay*

**Stats - Please help me**

A Bacteria has a doubling period of 8 days. If there are 2250 bacteria present now, how many will there be in 33 days? find the growth rate (Round this to 4 decimal places). Growth Rate___________. There will be _________ Bacteria. I came up with:.0668 for the growth rate (I ...
*March 13, 2015 by Bobbie*

**calculus**

A bacteria culture starts with 900 bacteria and the population doubles every 4 hours. Find an expression for the number of bacteria after t hours.
*November 5, 2010 by Anonymous*

**math**

A type of bacteria doubles in number every 12 hours. After 2 days, there are 48 bacteria. How many bacteria were there at the beginning of the first day. I know the answer is 3, but want to know how it arrived at the number "3"
*November 13, 2013 by Taylor*

**math**

It takes 28 minutes for a certain bacteria population to double. If there are 4,241,763 bacteria in this population at 1:00 p.m., which of the following is closest to the number of bacteria in millions at 4:30 pm on the same day?
*September 9, 2010 by Ross*

**Calc**

The number of bacteria in a culture is increasing according to the law of exponential growth. There are 125 bacteria in the culture after 2 hours and 350 bacteria after 4 hours. a) Find the initial population. b) Write an exponential growth model for the bacteria population. ...
*January 6, 2011 by Erica*

**math**

The number of bacteria in a culture is modeled by n(t)=1710e071t (a) The initial number of bacteria is (b) The relative rate of growth of this bacterium population is (c) The number of bacteria after 3 hours is (d) After how many hours will the number of bacteria reach 10,000...
*May 12, 2012 by someone*

**Math**

he number of bacteria in a culture is modeled by n(t)=1710e071t (a) The initial number of bacteria is (b) The relative rate of growth of this bacterium population is (c) The number of bacteria after 3 hours is (d) After how many hours will the number of bacteria reach 10,000? ...
*May 12, 2012 by someone*

**algebra**

A medical researcher wanted to determine the effect of pH (a measure of alkalinity or acidity, with pure water having a pH of 7) on the growth of a bacteria culture. The table below gives the measurements of different cultures, in thousands of bacteria, after 8 hours. pH ...
*December 6, 2014 by Barb*

**math**

A medical researcher wanted to determine the effect of pH (a measure of alkalinity or acidity, with pure water having a pH of 7) on the growth of a bacteria culture. The table below gives the measurements of different cultures, in thousands of bacteria, after 8 hours. pH ...
*December 6, 2014 by quintyn*

**math**

A medical researcher wanted to determine the effect of pH (a measure of alkalinity or acidity, with pure water having a pH of 7) on the growth of a bacteria culture. The table below gives the measurements of different cultures, in thousands of bacteria, after 8 hours. pH ...
*December 6, 2014 by Barbara*

**math**

A medical researcher wanted to determine the effect of pH (a measure of alkalinity or acidity, with pure water having a pH of 7) on the growth of a bacteria culture. The table below gives the measurements of different cultures, in thousands of bacteria, after 8 hours. pH ...
*December 7, 2014 by Quintyn*

**math**

I am submitting agian, I am not sure the answer someone gave sounds correct. We are learning about exponents. A type of bacteria reproduces by splitting in two every thirty minutes. How many bacteria will there be after 4 hours if there are 2 bacteria to begin with?
*November 3, 2010 by Kam*

**algebraic connections **

At the start of an experiment, there are 100 bacteria. If the bacteria follow an exponential growth pattern with a growth rate of 12%, what will be the population after 10 hours (round to the nearest bacteria)? Spell check
*February 24, 2015 by dustin chambless*

**Geometry**

Suppose you are studying bacteria in biology class the table shows the number of bacteria after n doubling periods n(periods)[0 1 2 3 4 5] billions of bacteria [3 6 12 24 48 96] your teacher asks you to predict the number of bacteria after 8 doubling periods. what would your ...
*March 8, 2010 by Anonymous*

**Bacteria**

What structural features of bacteria do you think help them to survive? Name four characteristics of bacteria that aid them in producting disease. http://en.wikipedia.org/wiki/Bacteria please read the link and then think about these statements: fast reproductive rate tough ...
*February 23, 2007 by Sabrina*

**MATH HW HELP!!**

The rate of bacteria growth in a laboratory experiment was at 16% per hour. If this experiment is repeated and begins with 5 grams of bacteria, how much bacteria should be expected after 12 hours? Round to the nearest tenth of a gram.
*May 20, 2014 by gia*

**Math**

The amount of bacteria after n min if the initial amount of bacteria is q and the amount of bacteria doubles every minute. (Hint: The answer should contain q as well as n.)
*June 9, 2010 by Mike*

**math**

The amount of bacteria after n min if the initial amount of bacteria is q and the amount of bacteria triples every 30 sec. (Hint: The answer should contain q as well as n.)
*August 18, 2012 by mary*

**SCIENTIFIC NOTATION**

A lab has two bacteria cultures. Culture A contains 8*10^4 bacteria and culture B contains 4*10^6 bacteria. How do the two cultures compare in size? A. Culture A contains twice as many bacteria as Culture B B. Culture A contains 1/2 as many bacteria as Culture B C. Culture A ...
*April 14, 2015 by Anonymous*

**math**

A colony of bacteria is growing in a petri dish which has a maximum capacity of 100mg. The mass of bacteria is increasing at a rate given by the logistic equation. Initially there is 2mg of bacteria and the rate of increase is 1mg per day.
*February 21, 2014 by Sam*

**Math**

I need some help. A biologist finds that the population of a certian type of bacteria double seach half-hour. An initial culture has 60 bacteria. 1. What is the population after 3 hours? 2. How long will it take for the number of bacteria to reach 983,040?
*April 9, 2013 by Kris*

**Math**

Bacteria A has an initial population of 500 and doubles everyday. Bacteria B has an initial population of 50 and triples everyday. How long will it take the population of bacteria B to overtake the population of bacteria A
*October 27, 2013 by Paul*

**Algebra 2**

A culture started with 2,000 bacteria. After 6 hours, it grew to 2,200 bacteria. Predict how many bacteria will be present after 12 hours. Round to the nearest whole number.
*May 7, 2013 by Kevin*

**Algebra**

It takes 30 days to fill a laboratory dish with bacteria. If the size of the bacteria doubles each day. How long did it take for the bacteria to fill one half of dish?
*January 1, 2012 by Anonymous*

**algebra**

It takes 30 days to fill a laboratory dish with bacteria. If the size of the bacteria doubles each day. How long did it take for the bacteria to fill one half of dish?
*January 2, 2012 by Anonymous*

**Stat**

A Bacteria has a doubling period of 8 days. If there are 2250 bacteria present now, how many will there be in 33 days? find the growth rate (Round this to 4 decimal places). Growth Rate___________. There will be _________ Bacteria.
*March 13, 2015 by Bobbie*

**Precalculus **

NEED HELP ASAP PLEASE!! A bacteria culture starts with 2000 bacteria and the population doubles every 3 hours. a) A function that models the number of bacteria after t hours is p(t)=____________? b) The number of bacteria present after 5 hours will be about _____ ? c) The ...
*March 4, 2010 by jh*

**Pre Cal**

A certain strain of bacteria divides every four hours. If a colony is started with 10 bacteria, then the time t (in hours) required for the colony to grow to N bacteria is given by t = 4(log(N/10)/log2 Find the time required for the colony to grow to one million bacteria. (...
*February 13, 2012 by Melek*

**Living Environment(please check answers)**

1-true 2-false 3-not enough info Transplanting genetic material into bacteria is a simple task- 2 Under certain conditions, bacteria reproduce at a rapid rate-3 The continued use of insulin from animals many cause harmful side effects in some people- 1 The bacteria used in ...
*March 12, 2012 by Anna*

**Bacteria**

I was growing some bacteria in Petri dishes that I got from wiping my hand with a q-tip. Condensation appeared directly above the bacteria when they got somewhat large. Was this H20 or something else? And why did it form? Humm The products of ellular respiration are water and ...
*January 14, 2007 by Sara*

**Calculus :)**

The number of bacteria in a culture is modeled by n(t)=1550e^(0.24t) (a) The initial number of bacteria is _____ (b) The relative rate of growth of this bacterium population is _____ (c) The number of bacteria after 3 hours is _____ (d) After how many hours will the number of ...
*August 22, 2011 by Brit*

**Math**

I have this hard question in math. can someone help me find out the riddle? I start with 1 bacteria. Every hour it doubles. How many hours until there are 1,000,000 bacteria? Can you make a function that describes this situation? What if I double it? I start with 2 glasses ...
*May 16, 2014 by Anonymous*

**Health (Ms. Sue)**

Describe how bacteria develop antibiotic resistance. A: Bacteria develop antibiotic resistance when it changes in a manner in which reduces or eliminates the effectiveness of drugs, chemicals, or other agents designed to cure or prevent infections. Also, if a person stops ...
*November 20, 2013 by Anonymous*

**math**

A bacteria culture starts with 260 bacteria and grows at a rate proportional to its size. After 4 hours there will be 1040 bacteria. (a) Express the population after t hours as a function of t. this is what i put as my answer but i guess its not right do i replace the four ...
*November 8, 2009 by aman*

**math**

The bacteria in a certain culture double every 7.5 hours. The culture has 6,500 bacteria at the start. How many bacteria will the culture contain after 3 hours? Select one:
*October 25, 2013 by Anonymous*

**math 12**

The bacterium Escherichia coli, or E-coli, has a doubling period of 0.32 h. If a culture starts with 100 bacteria: (a) Determine the equation for the number of bacteria, y, in x hours. b) How many hours will pass before there are 450 bacteria in the culture?
*May 6, 2012 by saya*

**algebra**

Two Questions: 1) A certain radioactive isotope has leaked into a small stream. 100 days later after the leak 10% of the original amount of the substance. Determine the half-life of this radioactive isotope. 2) During a research experiment, it was found that the number of ...
*August 28, 2014 by kenni*

**Math**

I'm not sure how to do this question 7. The growth of bacteria in culture can be described by the equation N1 = N0e' where N is the number of bactena at any time t, No is the initial number of bacteria, and k is a constant. The time taken for growth to double the number of ...
*December 15, 2009 by amelia*

**Problem Solving math**

The amount of bacteria after n min if the initial amount of bacteria is q and the amount of bacteria doubles every minute. I suggest you make a table.Start with 0 time and 1 bug. time #bugs 0 &sbsp 1 1 &sbsp 2 2...
*September 3, 2006 by Krisy*

**Algebra**

Which of the following is an example of exponential growth or decay? A. a colony of bacteria staying constant in quantity each week B. a colony of bacteria doubling in quantity each week C. a colony of bacteria increasing by 100 in quantity each week D. a colony of bacteria ...
*June 27, 2014 by Emma*

**math 12**

the population of a bacteria coleny, p, is doubling every day,d, according to the equation p=2^d. five days later, the population of another bacteria colny, q, is quadrupling everyday,d, according to the equation q=4^d-5. when will the populations of the two bacteria be equal...
*December 18, 2012 by miechelle*

**math problem-**

Bacteria grow in a nutrient solution at a rate proportional to the amount present. Initially, there are 250 strands of the bacteria in the solution which grows to 800 strands after seven hours. Find the time needed for the bacteria to grow to 1600 strands.
*May 12, 2012 by gwapa*

**medical **

If one bacteria will double every 20 minutes, how many bacteria will there be I'm 24 hours
*October 27, 2011 by dest*

**Maths **

A population of 3.5 million bacteria increases by 48800 How many bacteria are there now?
*March 23, 2014 by Sarah*

**Math**

Salmonella bacteria grows rapidly in a nice warm place. If just a few hundred were left on a cutting board when a chicken was cut up, and they get into the potato salad, the population begins compounding. Suppose the number present in the potato salad after x hours is given by...
*February 13, 2014 by Andy*

**Grade 12 Math-Urgent!**

Bacteria have a doubling time of roughly 10 hours. A normal bacteria starting population would be approximately 10,000 bacteria per ml of fluid...I am not sure if I have done these questions correctly and would like some confirmation before I hand this in to be marked! a.) ...
*January 9, 2008 by Math genius! Urgent!*

**biology**

assuming that there are 5 bacteria found in a glass of water. what is the population. of bacteria if it will not be controlled for 6 hours?
*July 11, 2011 by Anonymous*

**Science! URGENT**

Bacteria can reproduce through asexual or sexual reproduction. Environmental conditions for a particular bacteria species are good and the bacteria are thriving. Which form of reproduction will the bacteria most likely use? A. The bacteria will most likely reproduce through ...
*September 25, 2014 by Gwen*

**Algebra**

A lab is growing bacteria in a culture dish. The amount of bacteria in the dish doubles every 3 hours. Initially, there are 500 bacteria in the dish. How many are in the dish after 9 hours? My answer: 4000 -(5)^-1 My answer: -1/5
*February 6, 2014 by Anonymous*

**math**

A lab is growing bacteria in a culture dish. The amount of bacteria in the dish doubles every 3 hours. Initially, there are 500 bacteria in the dish. How many are in the dish after 9 hours? My answer: 4000 -(5)^-1 My answer: -1/5
*February 6, 2014 by Anonymous*

**Biology**

List two ways bacteria and blue-green bacteria differ. Any help would be appreciated. :)
*March 27, 2012 by Kai :)*

**Biology-Bacteria**

What are the two basic ways that bacteria cause disease? Thanks
*April 14, 2008 by Sue*

**Biology **

You have a flask with 100ml of fresh media. You place 200 bacteria int he flask. Assume that the bacterai were previously growing in the same kind of media and so the lag is 0. If you knew that this species of bacteria has a doubling time of 45 min in these particular conditon...
*September 23, 2012 by Anonymous*

**science**

If I had bacteria that were asexual and bacteria that were sexual in a pond- which would be most likely to survive disease and why?
*August 21, 2010 by Anonymous*

**pre algebra**

there is 100 bacteria in a petri dish. every 30 minutes the bacteria doubles. how muchbacteria will there be in 3 hours.
*October 19, 2014 by christopher*

**Ms. Sue PLZ HELP!!!(science)**

Humans developed antibiotics to fight bacterial infections. However, some antibiotics are no longer effective in killing the bacteria they once killed. How does the theory of evolution explain this? a. The antibiotic mutated the bacteria, which allowed resistance to develop. b...
*May 12, 2015 by Anonymous*

**Science**

which organisms are most important for a healthy lawn? a-birds, b-moss, c-bacteria, d-leaf hoppers, e-bees C=Bacteria
*September 11, 2013 by Lukas*

**microbio**

how large are bacteria? what are the requirements for autoclaving bacteria
*October 27, 2009 by lyne*

**precalculas**

the amount of bacteria in a petri dish increased by a percent change of 12% each hour over a period of 15 hours. a. find the growth factor for 1 hour? b. by what total percent did the bacteria change during this 15- hour time period.? c. how long will it take for the bacteria ...
*March 1, 2011 by katrina*

**Jake1214**

Let's say penicillin can kill the bacteria. After using it for 10 years, the bacteria developed resistance to penicillin, so no one is using penicillin anymore because it has no effect. After 15 years, reports have found that most of the bacteria loss the penicillin resistant ...
*December 19, 2007 by Antibotics - Resistance Evolution*