# My science fair project is growing bacteria from food that is left out and seeing how much the bacteria increases over time. How would I write my hypothesis?

109,078 results
1. ## Science

My science fair project is growing bacteria from food that is left out and seeing how much the bacteria increases over time. How would I write my hypothesis?
2. ## Math

A certain type of bacteria is growing at an exponential rate that can be modeled by the equation y=ae^kt, where t represents the number of hours. There are 300 bacteria initially, and 1500 bacteria 5 hours later. Find the rate of growth, k, of the
3. ## Math

A certain type of bacteria is growing at an exponential rate that can be modeled by the equation y=ae^kt, where t represents the number of hours. There are 300 bacteria initially, and 1500 bacteria 5 hours later. How many bacteria will be present at time
4. ## AP Environmental Science

I have a word problem about exponential growth. The problem is... "At 6am a few bacteria fall into a can of syrup in a broken garbage bag. The conditions of warmth, moisture, and food are perfect for growth and the population doubles every 20 minutes. By
5. ## Math Word Problem

At 6am a few bacteria fall into a can of syrup in a broken garbage bag. The conditions of warmth, moisture, and food are perfect for growth and the population doubles every 20 minutes. By 6pm the bacteria are overcrowded and dry and their food is gone.At
6. ## 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
7. ## 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.
8. ## 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)
9. ## 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
10. ## 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
11. ## 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.

Hi can you help me find the solution for this one? I have the answers at the end but I want to study how did it end with that. Thanks :) The number N of bacteria in a refrigerated food is given by N(T) = 10T^2 - 20T + 600, 1 ≤ T ≤ 20 where T is
13. ## Math

The generation time G for a particular bacterium is the time it takes for the population to double. The bacteria increase in population is shown by the formula G = t over 3.3log a p, where t is the time period of the population increase, a is the number of
14. ## 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
15. ## 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

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
17. ## Science

A deactivated deadly strain of bacteria was first treated with protease enzyme. It was then mixed with a harmless strain of live bacteria. The live bacteria became deadly. Which of the following statements is a valid conclusion from the experiment above?
18. ## Science

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?
19. ## 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
20. ## 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?
21. ## 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.
22. ## 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.
23. ## 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
24. ## 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
25. ## 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
26. ## 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
27. ## 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
28. ## Math1

Bacteria can multiply at alarming rate when each bacteria splits into two new cells , thus doubling. If we start with only one bacteria which can double every hour , how many bacteria will have by the end of one day?
29. ## Math1

Bacteria can multiply at alarming rate when each bacteria splits into two new cells , thus doubling. If we start with only one bacteria which can double every hour , how many bacteria will have by the end of one day?
30. ## 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?
31. ## 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
32. ## 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?
33. ## 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?
34. ## 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
35. ## 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.
36. ## 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?
37. ## 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
38. ## Science

What would be the origin of endosporeforming bacteria in pepper and other dried foods such as oregano? and.. How would a high number of endosporeforming bacteria in pepper affect the quality and other prepared and vacuum-packaged ready-to-eat foods? I know
39. ## 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
40. ## 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
41. ## Honors Algebra

A biologist is researching a newly discovered species of bacteria. At time t=0 hours, she puts on hundred bacteria into a Petri dish. Six hours later, she measures 450 bacteria. Assuming exponential growth, what is the growth rate "k" for the bacteria?
42. ## Algebra

f) Suppose you started with 100 bacteria, but they still grew by the same growth factor. Explain how your exponential equation in (b) would change. y=1*3x**** b) is Bacteria name: Staphylococcus aureus Generation Time: 30 minutes *Note: The generation time
43. ## 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
44. ## science

Are the following observations, predictions or hypothesis. I think: Birds eat worms when bugs are not available. Observation Infection is caused by bacteria. Hypothesis Honey is the food store for a bee hive. Observation
45. ## 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
46. ## Science

Can someone tell me if I have these three correct? Are the following observations, predictions or hypothesis. I think: Birds eat worms when bugs are not available. Observation Infection is caused by bacteria. Hypothesis Honey is the food store for a bee
47. ## Math

Suppose that the number of bacteria in a certain population increases according to an exponential growth model. A sample of 2600 bacteria selected from this population reached the size of 2873 bacteria in two and a half hours. Find the continuous growth
48. ## Algebra

Suppose that the number of bacteria in a certain population increases according to a continuous exponential growth model. A sample of 1800 bacteria selected from this population reached the size of 2272 bacteria in five hours. Find the hourly growth
49. ## 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
50. ## 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
51. ## math

Bacteria is growing in a petri dish. Initially, there were 15,000 bacteria in the dish. It triples every 8 hours. Write the equation to represents this growth after t hours.
52. ## Science

Can someone tell me if I am right? My choices are observation, prediction, or hypothesis Male Red-winged Blackbirds display red wing patches to signal superiority to other males. Hypothesis Bees make honey. Observation Male Red-winged Blackbirds compete
53. ## 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
54. ## Calculus

I just need help with one question. A bacteria population starts with 500 bacteria and grows at a rate of r(t) = 548e^(6.5t) bacteria per hour. Determine the number of bacteria after 1 hour. Thank you!
55. ## Math - Derivative of a polynomial function

The population, p in thousands of bacteria colony can be modelled by the function p(t)=200+20t-t^2, where t is the time, in hours, t is greater than or equal to zero. a) Determine the growth rate of the bacteria population at each of the following times.
56. ## 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!
57. ## 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
58. ## 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
59. ## math

Five bacteria are placed in a dish and then counted each hour. The first three bacteria counts were 12, 26, 54. If the pattern continues, how many hours after the bacteria were placed in the dish will there be 222 bacteria?
60. ## 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
61. ## 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
62. ## Maths

A population of 3.5 million bacteria increases by 48800 How many bacteria are there now?
63. ## Childhood ed

Pasteurization of food. A. means keeping food refrigerated. B. destroys all bacteria,viruses and mold. C. destroys most disease-producing bacteria. D. keeps it looking and tasting good.
64. ## Science Fair

My friend told me this science fair at Rockland, Rockland Sit Fair and I'm doing my science fair project on about the human body like junk food vs healthy food. What title I should use it for???? Plus can you give me the right information about this.
65. ## math

Bacteria are growing in a circular colony one bacterium thick. the bacteria are growing at a constant rate, making the area of the colony increase at a rate of 12mm^2 per hour. How fast is the radius changing when the radius is 3mm?
66. ## english

i just need some checking on my sentences if there is something wrong. thank you Ranchers and farmers are competitively trying to reduce their cost in many ways. This strategy reduces the quality of the product which brings problem to the food. Each year,
67. ## 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
68. ## 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
69. ## chem

radiated food can be safely stored for a longer time because radiation 1. prevents air oxidation 2. prevents air reduction 3. kills bacteria 4. causes bacteria to mutate is it 3 ?
70. ## Algebra

At noon, Professor Simon has a petri dish with 10,000 cells of Bacteria A. In another petri dish, he has 33,000 cells of Bacteria B. Every hour, Bacteria A grows by 8%. Every hour Bacteria B cells die off, decreasing the number of cells by 6%. After how
71. ## 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
72. ## 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
73. ## 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

At noon, Professor Simon has a petri dish with 10,000 cells of Bacteria A. In another petri dish, he has 33,000 cells of Bacteria B. Every hour, Bacteria A grows by 8%. Every hour Bacteria B cells die off, decreasing the number of cells by 6%. After how
75. ## Math NEED HELP URGENT

At noon, Professor Simon has a petri dish with 10,000 cells of Bacteria A. In another petri dish, he has 33,000 cells of Bacteria B. Every hour, Bacteria A grows by 8%. Every hour Bacteria B cells die off, decreasing the number of cells by 6%. After how
76. ## 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?
77. ## 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?
78. ## 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?
79. ## 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.
80. ## 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.
81. ## Math- Alg 2

A colony of bacteria is growing exponentially according to the function below, where T is in hours. How many bacteria are there after 7 hours? B(T)= 4*e^(0.8)T
82. ## 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,
83. ## Biology

According to my hypothesis, bacteria that lived millions of years ago communicated by their body language. The main problem with my hypothesis is that? 1 - it fails to explain the phrase body language 2 - it can't be disproved c - it may be false d - if
84. ## Biology

Can someone tell me if I am right? My choices are observation, prediction, or hypothesis Male Red-winged Blackbirds display red wing patches to signal superiority to other males. Hypothesis Bees make honey. Observation Male Red-winged Blackbirds compete
85. ## 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.
86. ## Anatomy and Physiology - HELP!

Hello! ____ Thanks for helping me. Currently, this is the only question that I'm confused, and that's preventing me from submitting my assessment. 6. Bacteria in ingested food is killed in the (1 point) a) antrum. - I'm not sure if I should call the
87. ## science

The doubling time of a type of bacteria is 35 minutes. If every bacterium reproduces, then after 35 minutes a population of 64 bacteria will have grown approximately to what size?
88. ## Algebra

Suppose that the number of bacteria in a certain population increases according to a continuous exponential growth model. A sample of 1000 bacteria selected from this population reached the size of 1274 bacteria in five hours. Find the hourly growth rate
89. ## 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
90. ## Algebra 1

I am having trouble with a few questions....Wondering if you could help...My answers have the *** by them..... 1. 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
91. ## 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
92. ## Calculus

The population of a colony of bacteria is modeled by the function p(x)=50(e^-x - e^-x^2)+10 ,for 0 ≤ x, where population P is in thousands, x is in hours, and x = 0 corresponds to the moment of introduction of a certain chemical into the colony's
93. ## 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
94. ## Calculus

I need some help with this Calculus problem. A bacteria population starts with 500 bacteria and grows at a rate of r(t) = 548e^6.5t bacteria per hour. A. Determine the function P(t) which gives the population at time t. C. How long does it take the initial
95. ## 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
96. ## 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.
97. ## 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.
98. ## pre calc

The number N of bacteria in a culture at time t (in hours) grows exponentially according to the function N(t) = 1000e^0.01t. 1.What is the population after 4 hours? 2.When will the number of bacteria reach 1700? 3. When will the number of bacteria double?
99. ## Calculus I

Suppose that the number of bacteria in a plate of food is given by N(T)= 10T^2 - 40T + 200, -1<=T<=20 where T is the temperature of the food in degrees Celsius. Suppose that the temperature of the food when it is left out on a picnic table is given
100. ## 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