science, biology

40,352 results, page 57

Biology

Why do eukaryotic cells develop, or how do eukaryotic develop?

Art Question

When children draw cross-sections of plants, they are: 1. intergrating science and art (Or) 2. intergrating mathematics and science Lordy. Surely you have some thinking on this, this question hardly stimulates the cerebral cortex. Did you mean integrating? Intergrating is ...

Biology

4)You count your cells and have 8x10ᶺ5 viable cells/ml you want to see (dilute the cells) to end up with 2x10ᶺ5 viable cells/ml. What volume of cells will you put into 20 ml?

Lang, Arts

1.Which of the following would always require a citation in a research paper? A.Thesis statement B.an anecdotal experience C.a quotation D.a humorous statement I think it is C...? 2. Which of the following shows the correct parenthetical citation for information from page 57 ...

Science

I need help with my science class. My teacher wants us to come up with property tests for many different substances to indentify them. I need three property tests for: Coal, Rope, Cloth, Plastic, Paper, Bean, Copper Granuals, Sand, Flower Petal and Rubber. Can you help me find...

Science - Please Help!

How can you tell the similarity between displacement and average velocity? It is for a part of a science problem. The lesson did not tell me how to do this. I have been stuck on that problem for a while. I also had my sister help me, and I looked things up for the problem. I ...

Science 8

IN science we are talking about chemical prefixes and compound names. For homework there are some questions where I have to "Name the Ionic Compounds" He talked about it but I am still confused, here is one of the questions. ht tp*:/ / img101.imageshack.us/my. php?image=...

biology

Why might it be worse to get an infection from someone in the hospital than from someone on a bus? is it because how bad the infection is, usually people that are in the hospital are in bad condition

Biology

In what situations would sampling work best for estimating population size, in what situations would mark and recapture work best and why?

Biology

(purple smooth = 75, white smooth = 28, purple wrinkled = 24, white wrinkled = 8) Account for the difference between the expected and experimental values.

biology

(purple smooth = 75, white smooth = 28, purple wrinkled = 24, white wrinkled = 8) Account for the difference between the expected and experimental values.

Biology

A genotype represented by the letters TT is considered to be which of the following? A. Heterozygous dominant B. Homozygous recessive C. Homozygous dominant D. Heterozygous recessive A? Not sure

biology

Give the phenotype and genotype for the F2 generation of a person with Type a heterozygous blood and a type O blood type. Remember to use all possible parents. Using Punnett squares I got 50% type a blood and 50% type o blood is this right??

Biology question pH

pH levels are each a 10-fold change so a change by 2 is actually a change by 1000. pH determines certain characteristics in organisms that allow them to live in certain areas so an alteration in pH changes their adaption skills. why is a change by 2 = 1000? what would a change...

Science

To solve the problem of a polluted stream a scientist traced where the pollution came from. She determined that the pollution was coming from many small sources. She worked on a plan to help reduce the pollution to the stream. This is an example of ____________________ ...

Biology

What is the effect of carbon monoxide in the blood? I think its because carbon monoxide combines with the blood to form carbooxyhaemoglobin which reduces the amount of oxygen combining with haemogloblin.Hence a person suffers from lack of oxygen and consequently may die from ...

Biology Lab

Can you please show me how to answer this question using C1V1=C2V2 A scientist receives a vial containing a protein at at concentration of 35mg/ml and is asked to add 0.25ml of it to 6.75mls of Biuret solution. What is the concentration of protein in the Biuret solution in mg/ml?

Biology

Synthesis means the process by which simple compounds are united to form more complex materials. Dehydration means loss of water. Explain why chemists refer to the joining of monosaccharide molecules to form disacchardies as dehydration synthesis reaction

Biology

Which of the following is true of an exergonic chemical reaction? A.Reactants lose mass as products are reformed B.Bonds are broken in reactants and new bonds are formed in products C.No activation energy is required to initiate it D.The energy released is captured by a catalyst

career help

one year ago This degree program is designed to prepare students to enter a career upon completing the degree with no further study required. Some are transferable to a state university program to continue education. Associate in Arts (AA) Associate in Science (AS) Associate ...

biology

Identify the plant like protest phylum or phyla that these phrases describe a.lack a cell wall b.mainly multicellular members c.photosynthetic d.cell wall composed of silica e.nuclear envelope f.ancestors of higher plants I am not sure which belongs to which. I don't ...

biology

All of the following important concepts of population genetics are due to random events or chance except mutation natural selection the bottleneck effect the founder effect sexual recombination I am pretty sure that the answer would be "natural selection", but I wanted a ...

biology

The primary reaction catalyzed by catalase is the decomposition of hydrogen peroxide to form water and oxygen, which occurs spontaneously, but not at a very rapid rate. Write a balanced equation for this reaction. (Remember that catalase is not a reactant or a product and can ...

College biology

In testing synaptic transmission, you found that there were 300 failures in 1000 trails of stimulating a presynaptic neuron. The average EPSP size was .7 mV +/- .2mV (mean +/- SD), and the average 'mini' EPSP size was .6mV +/- .1mV. Does the synapse obey Poisson statistics? ...

College biology

In testing synaptic transmission, you found that there were 300 failures in 1000 trails of stimulating a presynaptic neuron. The average EPSP size was .7 mV +/- .2mV (mean +/- SD), and the average 'mini' EPSP size was .6mV +/- .1mV. Does the synapse obey Poisson statistics? ...

biology

JANUARY 2009. This graph represents hormons and events in the 1.process of fetal growth and development. 2.process of meiotic cell divission during sperm dev elopment. 3.reproductive cycle of males. 4.reproductive cycle of females. i have to choose one of them what is the ...

math

on monday 86 science fiction books were sold at a book sale this is 8 more than twice the amount sold on thursday how many science fiction books were sold on thursday

Science 7R - Homework Check (Q3)

What's the function of a dichotomous key? My Answer: Dichotomous Key use by scientists are arranged in steps with two descriptive statements at each step. Is my answer to this question is correct??? BTW: I got this answer from my textbook in that section that my science ...

biology

What must the systolic blood pressure be valued at for adequate mean arterial pressure if the diastolic pressure is 75? (Assume resting conditions) A. at least 90 B. at least 95 C. at least 100 D. at least 105 E. at least 110 F. at least 115 G. at least 120

biology

The plasma membrane: Tick the box next to the ONE answer you believe is TRUE. A. can generate action potentials in excitable cells B. may burst in hypertonic extracellular solution C. can contain carbohydrates which confer ion permeability. D. is made up of a lipid core ...

Biology

I need help making a concept map. I have to put the following words into one and i don't know where to start. Gene DNA Chromosome Mutations Protiens Central Dogma Signal Transduction Nucleus mRNA tRNA rRNA Ribosomes Autosomes Sex Chromosomes Recessive Translation Transcription...

Biology

Which of the following is a NOT function of a vacuole? packing of materials transport of materials storage of materials breakdown of materials I'm confused. I know that vacuoles store materials, in other words, C is not correct since it's true. But the rest are wrong as well! ...

Biology

Which of the following properties of water would be most important in protecting a fish in a shallow pond on a hot summer day? A. the low density of water in the solid phase B. water's strong forces of adhesion C. the high specific heat of water D. water's solvent properties ...

math/science

Since the SI unit for temperature is Kelvin, why is the Celsius scale most often used in the science labs? I don't know that it IS the most often used. For example, almost all of the calculations require changing from C to K (gas law problems, and almost all others EXCEPT ...

Biology

name three ways somatic cells are different from gamete cells. 1. Gametes are sex cells and are always haploid 2. Somatic cells are non sex cells 3. ?

science and technology engineering mathematics

Do you have sites that can help me understand science and technology engineering mathematics?

BIOLOGY

You plan to generate many copies of this gene by PCR. You will then insert the PCR product into the plasmid. d) Which two primers from the list below will allow you to use PCR to amplify this gene? Check the two that apply. 5'-GTGCA-3' 5'-CACGT-3' 5'-TATGG-3' 5'-CCATA-3' 5'-...

Biology

Record any two of the following temperatures in your lab environment. In each case, allow the end bulb of the Celsius thermometer to remain in or on the sample for one minute. Cold tap water in a 50 ml beaker = ___ Celsius Hot water in a 50ml beaker= _____ Celsius

biology

Which of the following is the key factor driving cellular differentiation in the body? a. chemical gradients in the cellular environment b. expression of genetic coding c. rate of transcription d. cellular nutritional status c? confused cuz transcription is the first step in ...

biology

Which of the following is the key factor driving cellular differentiation in the body? a. chemical gradients in the cellular environment b. expression of genetic coding c. rate of transcription d. cellular nutritional status c? confused cuz transcription is the first step in ...

Biology (muscle response)

Suppose you are asleep and the doorbell rings. You stumble to your feet and move toward the door, open it and speek with your visitor. Think of the many changes occurring in your body as you awaken and respond. How does the three types of muscle tissue help? I'm having ...

biology

1. Cystic Fibrosis is due to abnormal mucus-secreting tissue. Abnormal pancreatic secretions and respiratory problems will occur. This is an autosomal recessive disease. The mother and father are carriers for the disease. A. What is their genotype? B. What is their phenotype? ...

year 7 science

My science homework is to collect 10 food labels which i have done and write down the food energy per 100g from each food in kilogrammes but the food labels i have have only got the energy in kj. i`m cofussed because i don`t understand the question and i can`t ask my teacher ...

biology

Hi, I am doing a summary assignment on the Temperate Deciduous Forest Biome and i need help finding "Highlights of abiotic and biotic factors", Climate graph showing temperature and percipitaion, a food web and a map showing Canadian location of The temperate deciduous forest.

BIOLOGY GR.12

What are the differnt conditions for yest fermentation. i have to make a hypothesis and experment based on yeast fermentation. I WANT TO KNOW WHAT EFFECTS THE FERMENTATION. for example using a higher temp to put my yeast in will make the fermentation faster. WHAT OTHER FACTORS...

Biology of Environment

Im having hard time differentiating b/w inductive and deductive reasoning. In inductive you find patterns, then you reach conclusion, in deductive you reach conclusion based on previous known facts, but i still not quite understand. I also not get the top-down, bottom-up.

Biology quick help

What is the method of nitrogenous waste removal for the following & choose between ammonia, urea or uric acid Tunicates Fishes Amphibians Reptiles Birds Mammals I think tunicates are urea and fishes are ammonia? But please help because I'm not sure and I don't know the rest

biology

it is not known if a tall pea plant is homozygous or heterozygous (a hybrid). you decide to do a test cross to find out. if there are 40 offspring and 7 out of them are short, what is the genotype of the unknown pea plant? draw a punnett square that represents this cross. ...

Math,english,further math,government,CRS,lit in english,yoruba,civic,agric,biology

The fourth and sixth term of an arithmetic progession are -4 and -10 respectively. Find A.the common difference B.the first term C.sum of the first twelve terms

Biology

I'm doing a research paper on Plectaster decanus, the Mosaic Sea Star and I'm looking for certain information on its diet. There is little information on the internet about this species so I was wondering what is the general diet of a southern Australian sea star? Also, does ...

Biology

How does diving bradycardia reflex help explain why we can survive after falling into cold water and being submerged for long periods of time? Give a physiological reason that explains the relationship between lung size and body size. From a physiological perspective, why is ...

Biology

A researcher collects high-resolution photographs of the Earth taken from outer space at annual intervals for the last decade. This data would be most useful to analyze which of the following? A. Human movement during crises B. Migration patterns of large whales C. ...

Biology

In a mycorrhizal relationship, what benefit does the plant get from the fungus? a. an energy source b. aid in seed dispersal c. products of photosynthesis d. aid in the absorption of water and minerals<-- (My Answer) Please help me, i'm having trouble with this one and i ...

Physical Science in Action

I need help with the scientific method for physical Science in Action and all I have so far is: Scientific methods in a circle and connecting circles with Scientific models , Experiments , observation and calculations and I have one circle left!! Please help ASAP

computer science

write a program to select the classes that you are taking(Ex. Computer Science) .When the button is clicked, the program should print the names of the computer language studied. If no, check boxes have been selected, the sentence "No language studied should be printed

Science

I have some homework questions that i am having problems finding. Please help! 1. What is the value of math to science? 2. What is the value of using graphs to represent data? 3. How do units give numbers meaning and help verify correct formulas? 4. Why are derived units more ...

Biology

I am lost in this Genetics Maze. Here is my assignment: Write out a cross using genotypes as parents Determine Possible Gametes that may be formed Use a Punett Square to establish the genotypes of all possible progeny. Determine the Genotype Ratio of the progeny. Count the ...

biology

When genetically engineering an organism, a plasmid a. is the main chromosome of the bacteria that is cloned. b. is cut with a restriction enzyme to accept the gene of interest. c. helps screen for cells that did not take up the gene of interest. d. combines with the gene of ...

biology

Which of the following are three common characteristics of echinoderms? a. tube feet, circulatory system, body symmetry b. marine-dwellers, endoskeletons, water-vascular system c. bilateral symmetry, ossicles, respiratory system d. mouths, protosomes, body symmetry B?

Biology

How do changes in DNA affect changes in adaptations? (I am of the assumption that changes in DNA spur the adaptations that take place--at least those through genetic mutation--and thus the adaptations that are most beneficial prevail. May I please have some clarification? ...

PSSA

when is the science PSSA test. also if you taken the science PSSA test, what would be on it?

Science

In our 7th grade Commprehensive science class we are learning about heat. So our project is about how animals adaptions for thermoregulation. And we choose the hooded Seal. We have found three adaptions sso far but the requirements are five. So far we have Blubber,Half whines...

PLEASE HELP

whats a complimentery line? Thank you for using the Jiskha Homework Help Forum. If you are studying Geometry: http://astronomyonline.org/Science/Geometry.asp

Biology

Why is milk vitamin fortified? What disease might this prevent? Pasteurizing milk destroys many vitamins. The have to be re added. One of the added vitamins, Vitamin D, prevents Rickets. What happens when the pH of milk is adjusted to 4.7?

biology

a) Describe the niche of the sea lamprey. b) Find out how sea lampreys may have entered the Great Lakes ecosystem. c) Identify the interspecific interactions of the sea lamprey and its effects on the Great Lakes.

biology

The brain stem is responsible for a. directing information in the brain and secreting hormones. b. regulating vital functions and memory. c. motor processing and regulating homeostatic functions. d. sensory processing and regulating balance. B?

Biology

Will iodine react with sucrose or glucose? I would say no, because it reacts with starch, a polysaccharide, and glucose is a monosaccaride and sucrose is a combination of fructose and glucose, two monosaccharides. Am I right? Why or why not? How does iodine cause a reaction to...

Biology

Will iodine react with sucrose or glucose? I would say no, because it reacts with starch, a polysaccharide, and glucose is a monosaccaride and sucrose is a combination of fructose and glucose, two monosaccharides. Am I right? Why or why not? How does iodine cause a reaction to...

biology

Problem 5: Functional Groups On the structure of MTX below, identify the functional groups that are present by dragging the functional group name listed below onto the appropriate target boxes on the structure.

Biology

A consumer can also be considered a a. herbivore b. autotroph c. heterotroph d. primary producer I think the answer is either a or c, because a consumer could also be a herbivore, but I don't know if the question is asking for a different name for a consumer which would be a ...

Biology

A group of natural populations that are reproductively isolated from other such groups and which interbreed or could interbreed with each other is called a... a. biological genus. b. natural family. c. biological species d. biological phylum.

Biology

Consider this pathway: signaling ligand ¨ G protein-coupled receptor ¨ G protein ¨ adenylyl cyclase ¨ cAMP. Identify the second messenger. Answer: A)G protein B)GTP C)adenylyl cyclase D)cAMP

biology

In a population that is in Hardy–Weinberg equilibrium for two alleles, C and c, 16% of the population shows a recessive trait. Assuming C is dominant to c, state the percent of the population shows the dominant trait? Show your work. Thank you!

biology

In a cross between a white-eyed female fruit fly and red-eyed male, what percent of the female offspring will have white eyes? (White eyes are X-linked, recessive)

Biology

1. Some people get repeated fungal infections because they cannot destroy these dangerous microbes after their white blood cells phagocytize them. This most likely means that these people have __________ that do not work properly. A. ribosomes B. lysosomes C. mitochondria D. ...

Biology

Produce a nucleotide sequence with a single base-pair substitution mutation that still produces the same amino acid sequence. Indicate the site of the mutation and explain why the amino acid sequence is not affected.

Biology-Ecology

Multiple choice What is the ultimate source of energy for most ecosystems, and in what form does the energy leave the ecosystem? 1. plants; animals 2. light; heat 3. plants; heat 4. producers; consumers 5. heat; light

Biology of the environment term

Teacher explained to us what limiting factor was but I'm not able to understand she said that a limiting factor causes increase in population but I not get how and why is called limiting factor than ? She also said how Phodphorus and nitrogen were limiting nutrients ?

Needs Urgent Biology Help!

This all about plasmids: I am totally lost, and my notes/textbook/internet doesn't give me the answer to this. Thanks for the help! Q: How is the number of fragments produced associated with the number of cut-sites available to a restriction enzymes? Q: Why do all the fragment...

Needs Urgent Biology Help!

This all about plasmids: I am totally lost, and my notes/textbook/internet doesn't give me the answer to this. Thanks for the help! Q: How is the number of fragments produced associated with the number of cut-sites available to a restriction enzymes? Q: Why do all the fragment...

Needs Urgent Biology Help!

This all about plasmids: I am totally lost, and my notes/textbook/internet doesn't give me the answer to this. Thanks for the help! Q: How is the number of fragments produced associated with the number of cut-sites available to a restriction enzymes? Q: Why do all the fragment...

Human Biology-Birth Defects

Hey I'm doing a report on clubfoot and I just researched this about it: "Complex segregation analyses suggest that the most likely inheritance pattern is a single gene of major effect, operating against a polygenic background." what does it mean by "operating against a ...

biology

Zola has a splinter in her finger. which of the following actions should she take before she uses a sewing needle to remove the splinter?Give reasons for your answer. a- wipe the needle with a clean cloth. b- wash the needle in hot soapy water. c- pass the needle through a ...

biology

In two to three well-developed paragraphs, explain how the graph below helps support the concern that burning fossil fuels has changed the atmosphere. Describe, in your own words, the change shown in the graph and how this change is occurring in the atmosphere. i cant post a ...

biology

You need a 5 microgram glucose/ml aqueous solution, but the lab balance is accurate to only 0.01g (ie., it displays 2 digits to the right of the decimal point) Describe 2 methods by which you could accurately prepare this solution using the lab balance. I don't know what to do...

Biology

The water cycle is best described by which of the following statements? Water in the atmosphere must be converted to another chemical before animals can use it. The water on earth changes forms as it moves from one reservoir to another.>----- My answer As water moves ...

Advanced Biology

A recessive lethal gene in chickens causes circulatory failure and death of the embryo at 70 hours.A commercial hatchery finds that a hatching failure due to this gene of greater than 4% is unacceptable.What is the upper limit for the frequency of this allele in the breeding ...

Biology

If .03 M of sucrose and .02 M of glucose rest inside a cell and .01 M of sucrose, glucose, and fructose rest outside in the environment, which solutes will exhibit next diffusion into the cell and out of the cell?

biology

which of the following statements are true there are 2 polar covalent bonds in water there are 3 ionic bonds in water there is 1 ionic and 1 covalent bond in water electrons are less attracted to oxygen than hydrogen

Biology

Dr. Paul is blood type O. His father was blood type A and his mother was blood type B. What were the genotypes of his parents and what are the possible blood types and ratios expected for crosses involving these parental genotypes?

biology

Given the part of the molecule shown below, can the underlined atom participate in a hydrogen bond with an approriate bonding partner? −O−−−H −C−H−− −N−−−H −O−H−− −C−&#...

Gr 11 Biology

if you were a snoker, what lung volumes (tidal volume, expiratory reserve volume or vital capacity) would be most affected? i think the answer would be the expiratory reserve volume

biology

if a person exercise in a warm environment and if he exercise in a cool environment, will there be any difference between the amount of calorie he will lose?and if,in which environment he will lose more calorie? please explain the reason.

Science

So I'm in 7 grade and doing a science project. I have a question: What does it mean when it says: RESEARCH? I am required to have this on my board. Does it mean what I looked up to help me on this project? Also, what does it mean when it says: DATA? Do I just summarize what ...

Science

In the experiment water clock : what changes (independent variable) , how does it responds to the changes made(dependent variable), and what is being controlled (controlled variable). Pleas I really need this by today. And also my question for science fair is what part does ...

Science

I urgently need to talk to one of your science teachers. In particular, I need help to define the objectives for our two-year Comenius project concerning biodiversity in water. This comparative study will be carried out in English. 1) As you know, it will involve 17-year-old ...

Math

John has 4 math books, 6 biology books,, and 8 statistics books to arrange on a shelf. In how many ways can he arrange the books so that books on the same subject are grouped together?

Biology

Which of the following properties of water would be most important in protecting a fish in a shallow pond on a hot summer day? the low density of water in the solid phase water’s strong forces of adhesion water’s high specific heat water’s solvent properties Help? I can'...

Biology

Are these correct? Cohesion=Water molecules stick to the side of a straw because of this attractive force. Adhesion=Liquid mercury forms drops because of this attractive force Polarity=This property of water enables salt to dissolve in water Base=This is a substance that ...

bio

I am doing the biology ap bacteria DNA transformation lab and I came up with a transformation efficiency of 150,000. I read somewhere that they should be between 2,000-8,000. is my answer way off? My group counted an average of 1529 colonies to begin with so i don't see how ...

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