Biology - October 2007

2007-10-02 07:43:15 · 1 answers · asked by Anonymous

Okay, so this is my assignment but I have no idea how to do it. I've been trying to figure it out since last night.

b. write out the substrates, enzymes and products of at least three steps in the following format, with one enzymatic step per line:

Substrates --[enzyme]--> product(s)

c. Indicate the source you used for obtaining this information.

He gave an example:
Pathway: Pyrimidine biosynthesis
1. bicarbonate + glutamine + 2 ATP --[carbamoylphosphate synthetase]--> carbamoylphosphate + glutamate +2 ADP + 2 phosphates
2. carbamoylphosphate + aspartate --[aspartate transcarbamoylase]--> carbamoylaspartate + phosphate
3. carbamoylaspartate --[dihydroorotase]--> dihydroorotate + water
Source: Neuhard, J. & Nygaard, P. (1987). Purines and Pyrimidines. In Escherichia coli and Salmonella typhimurium: Cellular and Molecular Biology.

The pathway I've chosen is Oxidative Phosphorylation.
So could someone help me please?

2007-10-02 05:40:45 · 1 answers · asked by lety 2

2007-10-02 04:49:10 · 5 answers · asked by Anonymous

2007-10-02 04:43:35 · 2 answers · asked by damigurl05 1

People say that DNA testing has proven the Book of Mormon to be false, because it shows that the Native American Indians are not descended from the Jews. But, wouldn't you need the DNA of the people who you are comparing DNA with? For example, to know if today's Native American Indians are descended from the Lamanites, you would need the DNA of the Lamanites from the end of the Book of Mormon. And even then, nothing will be conclusive, since many centuries have passed and DNA gets "diluted" or "evolved" or whatever.

2007-10-02 04:18:24 · 9 answers · asked by mormon_4_jesus 7

is it reticular tissue?

2007-10-02 04:16:28 · 1 answers · asked by Terri L 2

is it stratified cuboidal epithelium?

2007-10-02 04:14:27 · 2 answers · asked by Terri L 2

My molecular biology of the cell book says that genomes have evolved through mistakes and accidents. With DNA polymerase having a high fidelity (I believe one mistake in 20,000 base pairs), how do you explain evolution from a common ancestor (I.e. an ape-like creature)? Is this the best it gets? Accidents and mistakes in DNA replication and DNA repair have created intelligent human beings. How so?

2007-10-02 03:53:53 · 8 answers · asked by Anonymous

2007-10-02 03:23:30 · 1 answers · asked by damigurl05 1

2007-10-02 03:22:31 · 1 answers · asked by damigurl05 1

Describe 2 similarities and 2 differences

2007-10-02 03:16:05 · 7 answers · asked by damigurl05 1

2007-10-02 03:14:19 · 1 answers · asked by damigurl05 1

2007-10-02 02:40:27 · 6 answers · asked by Saved by Grace 3

immersion of red blood cells does not result in haemolysis in: A) isotonic acetone at 20 degrees B) hypertonic salt solution at 20 degrees C) hypotonic salt solution at 20 degrees D) isotonic salt solution at 80 degrees

thanks :)

2007-10-02 02:00:49 · 5 answers · asked by xxx 3

Methane acts as a greenhouse gas in the atmosphere. The main source of methane are the digestive systems of cattle and sheep, bacterial action in rice paddies, burning of biomass (eg. forests fires), bacterial action in swamps and marshes, burning of coal and release of natural gas.

a) Discuss whether methane emissions from these sources will cause a change in the Earth's temperature.

b) Discuss whether release of methane is a natural process or an example of a human impact on the environment.

c) Suggest measures that could be taken to reduce the emission of methane.

2007-10-02 01:44:49 · 1 answers · asked by js142004 2

I need it for a sci. project my research class is working on.

2007-10-02 01:38:28 · 3 answers · asked by lovelyluna 1

why does laughing make sneezing hard

2007-10-02 01:30:38 · 12 answers · asked by Grinning Football plinny younger 7

2007-10-02 01:01:07 · 1 answers · asked by Shiela C 1

I want to know if you were, for example, drinking from a glass and just kept drinking and drinking... is it dangerous for your body? Is it possible to somehow drown from this? (I don't mean by shoving your head in a bucket of water!).

2007-10-01 19:14:27 · 7 answers · asked by Nikita (Australian) 4

Some vegetables wilt as they age. explain this occurence in the terms of osmosis. describe how you can use osmosis to restore the crispness of such vegetables.

2007-10-01 18:09:09 · 7 answers · asked by Jim G 2

2007-10-01 18:02:13 · 2 answers · asked by I_color_outside_the_lines 4

2007-10-01 17:53:04 · 4 answers · asked by ck 1

i don't know the answer to these questions. but i've dont everything else..

3. When viewing a cell under the microscope how can you tell if it has depth or thickness?
9. Why can’t cheek cells and onion cells carry out photosynthesis?
5. Why do we stain cells when sometimes viewing them?
17. What's the cell theory?

2007-10-01 17:42:11 · 2 answers · asked by mnc 1

Why do pancreas cells have more ribosomes then another part of the body... I know that ribosomes synthesize proteins... Why are proteins important for the pancreas ? Is it because of the production of insulin ?

THanks

Ciao ;)

2007-10-01 17:34:33 · 5 answers · asked by Anonymous

How would i go about designing the plasma membrane of a "hypothetical" plasma membrane of a mineral-absorbing
cell, with reference to mineral-permeable channel proteins and mineral-transporting active-transport proteins


I need help BADLY!

2007-10-01 16:59:30 · 3 answers · asked by isaiah`s mommy 2

I read in my text book that ions are found in enormous collections of ions and they have no single bonding partner.

Why though? I mean, take NaCl for example, isn't Na's partner Cl? And why are other ions attracted to this pair? Don't these two complete each other? Why can't this pair be called a molecule? What connection to they have with other atoms, or even other Na's and Cl's? Weren't all the electrons already transfered? So what do these other ions want?

To tell you the truth, I don't really know much about chemistry. So help me out! :) What does it REALLY mean when an atom is charged? I mean, what can it do in this state?

2007-10-01 15:53:41 · 4 answers · asked by Anonymous

blood type that adopts quickest, mutates with the virus quickest, etc.

2007-10-01 15:49:38 · 4 answers · asked by Anonymous

2007-10-01 13:44:18 · 3 answers · asked by Chrispy97 1

2007-10-01 12:58:16 · 4 answers · asked by Ash 1

How does it work? What changes the blood type in a child? Can a child with parents that are O+ have a child with O- or even something like A+?

2007-10-01 12:37:06 · 5 answers · asked by Anonymous