Biology

What are halophile, thermoacidophile and methanogen archaebacteria?

I understand that an allele is the alternate version of the same gene but do two of the same alleles make up a gene? Do genes contain two alleles each?

how to find out plasmid size

I am struggling with this unit.. i dont no wher to start my revision, i dont have a clue! im also repeating module 1 because i was 3 marks off an A.. and i want to do dentistry so I need top marks!! Can someone please give me notes or something, cause all i have as notes is the revision guide and a huge textbook 🙁 and my exams are in three weeks!!

A researcher is given the task of designing a protein that will bind to a receptor very well. The receptor's binding site has strong positive charges at the edges and negative charges in the center. How would you go about designing the protein to bind to it?

It shows a family tree. The genotypes of the grandparents regarding a recessive genetic mutation (a) that causes a genetic disorder are given. I can't draw it, so I'll describe it. The first grandma is AA and grandpa is Aa. They gave birth to the father. The second grandma is Aa and the grandpa is Aa too. They gave birthe to the mother. The mother and father then gave birth to the child... QUESTION: What percent chance does the child have of inheriting the disorder? Of being a carrier? Of not carrying the mutation at all? Show your work. QUESTION 2: You discover that those with the disorder rarely live beyond 5 years. How does this change the percentages? Show your work. It's one of the homework questions for test revision and I can't do it!

movement in and out in the celll

Which organelle modifies cell products, packages them for distribution, and then may turn into vesicles and bubble off the surface of the cell?

In my up coming exams one question is about CITES. I wa sjust puyting this out there to see if anyone could tell me, (1) whether it is working (pros)? (2) the implications/ how it is failing? (3) people's opinions or any good research articles/journals Thanks in advance

(This is for AS environmental studies) could I have reasons for how these factors are important for life on Earth. Thanks.

-distance from sun -tilted axis -mass of the planet -magnetic field -day length

A-level bio Q. How does ions cross the phospholipid bilayer? can very small ions just diffuse across?

Define photosynthesis

Describe the path that water takes as it enters and exits a maple tree?

describe the path that water takes as it enters and exits a maple tree

does the distribution of invertabrates in a habitat depnd on the light intensity?

I conducted a study and am comparing the results of two sites where I put pitfall traps. One was a sheltered, upturned soil area (here more species were found - a wide range) and one was an open grassy area with not much shelter. Can someone explain different factors that may affect this other than light intensity? ANY HELP APRECIATED!!

Does anyone know what diverticulitis is?

How does DNA control the synthesis of proteins?

do a leaflet about 1 group of vertebrates

I'm doing past exam questions and quite a lot of old exam questions ask about the effect of cyanide on respiration - is this on the new AQA specification??

do you agree with animal testing? why?

how are we supposed to study for the biology paper unit 3, report questions

1. Key Points and Differences with egg and sperm donation.
2. Research egg and sperm donation for use in IVF.

Thanks!

Explain how pH ,temperature ,enzyme concentration and substrate concentration affect the rate of enzyme action.

Explain the effect of competive and non competitive inhibitors on the rate of enzyme controlled reaction . make reference to reversiable and non reversiable inhibitors.

i want to know about enzymes ,every thing about enzymes ,washing powder.

Animal cells, including those of humans, are eukaryotic cells. Explain the link between mitochondria in muscle cells and rough endoplasmic reticulum in enzyme secreting cells from salivary glands. The cells in tadpole tails are specialised and contain many more lysosomes compared to its other cells. Describe he production of lysosomes and suggest how this adaptation allows a tadople's tail to be absorbed as it changes into a frog. Animals tend to be multicellular organisms. Give the levels of organisation responsible for creating organisms.

I am studying animal/wildlife conservation. I have to come up with a title or idea for a project where I can do some of my own research in the UK and compare with similar research. Could anyone help me out and point me in a certain direction, I have absolutely no idea what area to focus on or what project to do! Any help will be appreciated!!!

explain the mode of inheritance of feather colour in a brown layer

Explain why the mode of inheritance of feather colour means that a farmer will

how do you create a food chain?

Plssss anyone hellllppp

I would like some help with the revision

What is a gene..?

can you tell me a bit about how a heart works

help with human biology

I seriously need some help with my science homework! You have to fill in the gaps with the words below. You do not need to use all of the words:

When whole animals and grow they get bigger. This happens because their cells divide by cell . One cell can to make two new ___cells.

Cells of the same kind can make a . Different types of tissues make . Organs can work together in an organ . The heart is an organ made from and nerve . It is part of the ____system.

The lungs are part of the system. The brain is part of the system. Food is broken down in the _________ system.

The words are:

DAUGHTER DIVIDE DIVISION PLANTS REPRODUCE SON BLOOD BREATHING CIRCULATORY DIGESTIVE MUSCLE NERVE NERVOUS ORGANS SYSTEM TISSUE TISSUES.

Thank you so much!!! Cerys

How do plants use anaerobic and aerobic respiration to survive?

How do you find out the true value of a set of results in Biolgy

How does homeostasis work?

what would the gradient show?

Really need help asap

I need some arguments for and against how the theory of evolution relates to nutrition. If you could help me think of some points that would be great, thanks! 🙂

I need help on this for my ISA..so please any accurate information will be beneficial and can I have the website or books for where you received your knowledge from. Including authors and links. Thank You .:)

I’m supposed to do a PowerPoint presentation on Plastic Waste for my Environmental Science course. Besides that, I have already done a research on the same topic. Do you guys know what materials should I memorize? Like should I just memorize the research only?

how to separate water from flour

how to zoos intend to use science as well as natural methods to breed pandas

How would rinsing your mouth with salt reduce the swelling of gums?

Question: Describe how you would investigate the effect of an enviromental factor on growth of plants that all share the same genetype. Give full practical details that ensur eyou have designed a valid investigation.

I need to do a poster on Sickle Cell Anaemia. What can I do to make it interestin nd lively? Any ideas?

Any tips for IGCSE Biology that may help me?

In chickens, males have two Z sex chromosomes (ZZ) and females have one Z and one W sex chromosome (

Explain the characteristics of enzymes and (using named examples), the lock and key theory of enzyme action. Include in your answer, an explanation of the role of enzymes in both catabolic and anabolic reactions.

discuss the leaf modifications of poison ivy and squash plants that are designed to prevent organisms from touching or eating their leaves

Why do phospholipids form bi-layers and triglycerides form droplets??

1. The genes for ruby eyes (rb), tan body (t) and cut wings (ct) are all found on the X-chromosome of Drosophila melanogaster. All of these are recessive traits. They map in the order rb, ct, t with 12.5 map units between rb and ct and 7.5 map units between ct and t. Suppose you cross a cut wing male with a homozygous female that is both tan and has ruby eyes.
2. What will the F1 females look like?
3. Draw map of the section of the X chromosomes that has these 3 genes for the F1 females
4. Assume you testcross your F1 females.
5. What progeny classes would you expect? ii. Give approximate numbers for each class based on a total of 2000 progeny.
6. Assuming the i=1 and there are no double crossovers.
7. Assuming the i=0 and there are the expected number of double crossovers.

Could I have info about how endangered the Mexican Walking Fish is please 🙂

What is the main limitation of light microscope compared with electron microscope?

why do muscles have to work in pairs?

Name the amino acid carrier in a cell?

Need , tips, practical help in improving my grade ... any tutors willing to help please..

What is the definition of osmosis

What are the raw materials for photosynthesis?

Phytoplankton are microscopic autotrophs that are the foundation of many aquatic food chains. The amount of photosynthesis carried out annually by ocean phytoplankton alone is of a similar magnitude to that of all terrestrial plants combined, making them an important subject for ecological research. Ocean phytoplankton photosynthesis can be studied using a wide range of techniques, from satellite imaging to measure whole oceans to collecting small samples and analysing their behaviour in the laboratory.

(a)In recent years phytoplankton have been investigated as a potential source of energy for humans. Researchers have therefore been interested in whether these organisms could be ‘farmed’ to provide food or fuel. In terms of biomass, Gross Primary Production (GPP) in phytoplankton living in a layer just below the surface of a typical ocean area is 4102 g m−2 yr−1 If you . assume the energy value of phytoplankton is 6 kJ g−1, calculate the GPP in terms of kJ m−2 yr−1 .Show your working clearly .

(b) If a human needs to eat about 10 000 kJ per day, estimate (to the nearest gram) the mass of phytoplankton that would be required to meet their daily energy requirements. Based on this value, approximately what proportion of her own body weight in phytoplankton would a 60 kg woman need to eat over the course of a year, if this were her only source of energy? Show your working clearly.

(c) Farming phytoplankton to harness solar energy for human food or fuel would presumably require cultivating large numbers of these organisms in a carefully designed artificial environment. Suggest two features that could be incorporated into the design of a phytoplankton ‘farm’ to optimise the Net Primary Production (NPP). Briefly describe why each design feature would be useful. (One sentence for each)

what makes a plant green?

What are some issues people can face of they have too much protein in their diet?

Do humans have the enzyme reverse transcriptase or do only retroviruses have it?

At which point in the process does the scientist determine the variable to be tested?

It comprises of phosolipids right? The phosphorus is hydrophilic, and the fatty acids hydrophobic. I asked my teacher how the water diffused in and out of the membrane then, and she said. "The water molecules are small enough that they just go through"

Now. I know I'm the student, but that doesn't fit with me? Then I learnt about the transport protiens. And that made more sense.

But, is that the defenite way, and if so, what really happens in the process of water going in and out of the membrane?

Explain why the carbon cycle cannot effectively help reduce atmospheric CO2 levels.

the distribution of invertebrates in a habitat depends on the light intensity

This homework is due tomorrow!!!!!! Please help me!!!! I need to explain how antibiotic resistance has evolved in bacteria.

i need facts about tb

What's the difference between cell mediated response and humoral response? are they both a type of specific immune response?

I would also like loads and loads of exam style questions, but not sure where to get them.

What are the endoskeleton and evoskeleton?

what can be seen on inflammation of appendix under 40 magnification icroscope

What happens in the Calvin cycle?

What is an allele?

Simple Form Please?! need info+ things about Darwin+ Darwinism!?

a) Contamination by laboratory workers handling the specimens b) That the ancient DNA might infect the archeologists. c) The degradation of the DNA by chemical damage over time d) The introduction of modern DNA onto the sample by archeologists in the field site.

What is respiration?

During meiosis 🙂

when the 2nd tRNA is formed between 2 amino acids what bond is this called?

I am studying Biology Unit 2: The Components of life with the Edexcel board using the new specification. As it is a new specification (2011) there is no past papers available so I am in search of some revision notes that could help me.

which type of blood vesels in the arm possesses vales

which type of blood vessel in the circulatory system has a pulse?

Why are most rodents eyes completely black?

why is asceptic technique important in microbiology

why is respiration an important process in the cells of germinating seeds

Is it ok to write the answer in bullet point form or does it have to be in a proper essay format?

Why do muscle cells have a high amount of mitochondria?

I approach this by thinking of a cell as my entire body. If I lie in bed and do nothing all day I am like a fat cell. I only need a little energy which I get from a small amount of food in the way that fat cells only a little energy which they get from a small number of mitochondria. On active days I am like a muscle cell. I need lots of food in the way that fat cells need a lot of mitochondria to give them energy. Mitochondria are the energy factories for all cells. ATP synthesis occurs in them by ADP and Pyruvate synthesizing to create ATP, which is energy. Muscle cells work hard to move and contract and this is why they require a lot of energy thus they contain more mitochondria to produce a high level of ATP

Why do heart cells have a high amount of mitochondria?

Mitochondria are the organelles in the cell that produce energy in the form of ATP. When cells complete the process of cellular respiration they produce oxygen, glucose (C6H12O6), and this form of energy. The heart muscle is truly amazing in that it is constantly contracting and relaxing, and never tires. Mitochondria are the means of providing energy for this constant activity, and a lot are needed for this. As the heart is constantly pumping blood around the body, it needs a rich supply of oxygen and glucose. There are more mitochondria found in heart cells because this means we are able to produce enough energy to keep it functioning efficiently. This is a trait we humans have evolved in order to increase our chances of survival.