Biology

In which one of the following situations would you expect hemoglobin to have the lowest binding affinity for oxygen? a. in your thigh muscle after you have been running for a minute b. just below the surface of the skin on a cold day c. in the pulmonary vein d. in the kidney e. in the lung I want to say A but I'm not sure. My reasoning is that the level of DPG is highest during A so the binding affinity for oxygen by hemoglobin is at its lowest. Am I correct?

Outline an experiment that would show that immunoglobulins contain heterodimers? I have this question in my class and I need some help on it. Any examples in detail would be helpful. Thanks a lot.

are hormones liquids or solutions?

I have an in class topic on the D. Melanogaster fly. we're breeding them and doing test corsses etc. I have to answer this lat question on logic. Logic isn't my strong suit. Below are three of Mendel's premises and a conclusion. Does the conclusion follow logically from the three premises stated? Explain your answer. if it does not then provide an alteration to addition to the premises that would lead to that conclusion. The three premises as follows: 1. parents do not transmit traits directly but do so through genes, which code for the traits. 2. Not all copies of genes are identical, and different alleles exist coding for different expressions of eac…

After a heart attack, people often have small amounts of lactate in the blood, which comes from the injured heart muscle. Suggest an explanation for this observation. Well, I know that during anaerobic respiration lactic acid or lactate (for what I presume is the same thing) is produced as a by-product of respiration. However I fail to see the connection here? I don't really want to assume things which I am not sure of. Any help will be appreciated!

Hi people... I had a SAC (student assessed coursework) yesterday and i have a test on it next week, and i was wondering if i could get some advice. Firstly if anyone has done anything similar to this before (below) heads up would be great (although admitedly, cheating... but anyway) The prac was this: We reacted equal amounts of hyddrogen peroxide into mixtures of detergent, and liver, where each of the three test tube used had fresh dice liveer smaples, boiled samples and crushed samples (with sand) respectively. The reesults were that the first andd last eruted in bubbles and the boild sample did nothig. My knowledge so far of this, is that with the fresh live…

I know that proteins are polymers but are peptides considered polymers?

i ruptured my achilles earlier this year. surgery was discouraged. my leg was put in plaster (initially in the equinus position) for 11 weeks. it is now healed. but what actually happened? how did the two ends 'knit' together (if 'knit' is the correct word?)?

Procedure Catalase is an enzyme that works very rapidly. It is found in several organs and tissues, including the liver, where its role is to speed up the decomposition of hydrogen peroxide into oxygen and water. Hydrogen peroxide is a by-product of meabolism and is toxic, so its rapid conversion to water is therefore important. 1) Collect nine small pieces of liver. 2) Place three in a beaker half filled with water and boil strongly for 5 minutes. 3) Place three in a mortar with a little sand and grind with the pestle. 4) Label the test tubes A,B and C and place 5 mL of hydrogen peroxide and 3 drops of detergent into each. 5) Place the fresh liver into tube…

It seems that scientists cannot find any evidence of evolution

senegal bushbabies weigh around 250g and are around 16cm long (excluding the tail) but they can jump around 5m. :confused:does anyone know how they manage this or can provide a site showing the anatomy of their legs and describing how its done because that is pretty amazing. also, if you know of any mammal which is a better jumper please say so:-)

I've been hearing now that it's possible for some instruments to measure some of your emotions. For example, they can tell if you are happy or sad, but how is this accomplished? My guess is through a correlation, they get a particular brainwave and ask the person how they feel and the person knowing how they feel would tell them, and they can use this again, when the brainwave manifests they know how the person is feeling. What about stress though. Is there any machine that can quantify how much you are feeling, say could group it on a 1 to 10 scale, where 1 in the mildest stress possible, and 10 is on the breaking point, on the verge of having a nervous breakdow…

http://www.cosmosmagazine.com/news/2422/injectable-liquid-bone-developed +++++++++++++++++++++ There is one problem Stem cells will not stimulate bone growth or repair.We do not know how tell cells to stimulate bone growth or repair.Well that substance that is soft like toothpaste than gets very hard like bone is amazing. You can use that substance to stimulate bone growth or repair.

According to The Diagnosis of Man by Kenneth Walker anyway, you can have it removed and not die. How come you wouldn't just get all weak and your heart slow down and all that?

I will be doing an experiment on enzymes tomorrow. It will involve catalase and a liver which will be grind. Anyone ever done a similar experiment? Merged post follows: Consecutive posts mergedNevermind...I guess it depends on the organism. Merged post follows: Consecutive posts mergedActually...does anyone know what the optimum temperature of catalase in either cow, pig or sheep? If the liver were to be removed from the animal would the enzyme still work best at a certain and particular temperature, as though the animal were alive? If so, what are these? Does anyone know? And...yes I know it's getting a little technical.Well any ideas will be appreciated!

Does anybody know at what PH it works best at?

if sodium and potassium ions form the cations in our body what forms the anions?

I need some help about use of hydrofluoric acid to make opaque end in a coverslip, to use for 3D nuclei FISH!

For those of you who don't read my blog, I recently confronted Microban International Ltd, over their wide scale use of long lasting antimicrobials in products from pencils to flooring (and more). At any rate, I wrote them an email about it, and got a response (which I share here). They sent me a paper, and I need help trying to falsify it (I've turned it into a Google doc). I'm going to be reading it in detail over the course of the next couple days. The purpose of this thread, is that I don't expect to have enough background in this area to tackle the paper on my own. Anyone who wants to help, please read the paper and we can discuss it here…

Everytime I want to start an experiment somebody has already discovered it or did it. Is there a list of undiscovered things. I am breeding shrimp right now . but nobody really cares about that. Suggestions?

Today we are going to share some opinion on whether fastfood is necessary in this days. The debate is not a formal one ,you can prise or complaint. Merged post follows: Consecutive posts mergedIn my opinion ,fastfood nowadays cause so many problem. It is with fastfood ,a 6 year old girl can gain 9 pounds in just 4 month. It is with fastfood,we are faced so many healthy problems Despite some of their recent healthful offerings, the menus still tend to include foods high in fat, sugar and calories and low in fiber and nutrients,” Merged post follows: Consecutive posts mergedThe current facts are a large majority of people just chose the fastfood resturents as a…

Recently I have been reading a book titled “MIND in LIFE. Biology, Phenomenology, and the Sciences of Mind.” By Evan Thompson. The book explores the so called explanatory gap between biological life and consciousness. Thompson argues that life and mind share common principles of self-organization, and that the self-organizing features of mind are an enriched version of the self-organizing features of life. Thompson states “The idea that all life evolved from a common ancestor and hence that there is an underlying unity to the widespread diversity of life is central to modern biology. We are taught in school that the unity of life is based on three things: (1) all…

I was wondering one day how life might function in other dimensions. I got to thinking about it, and i read online that life couldn't exist in 2 dimensions because it wouldn't be able to eat ( it digestive system would bisect it). I realized though, that it doesn't necessarily need to remain open all the time. In theory it could take in food, close its mouth, digest it, then create a new opening to eject waste material, similar to vacuoles moving in and out of the cell wall to take in and eject food. anyone have any ideas how life could function if other dimensions?

I was wondering if anyone knows what determines weaning age in mammals?

There are a lot of articles highlighting the importance of physics in biology. Advances in physics often leads to an advance in biology. Protein structure is one of the fields that has benefitted enormously from physical techniques such as X-ray diffraction, atomic-force microscopy and more besides. And more recently, there have been advances in gene expression understanding due to semiconductor physics. But is the reverse also true? Has biology ever helped the progress of physics? Have biologists ever turned their attention to a physics problem and solved it?