Biology - February 2007

1.) concerning amino groups which is a false statement?
they r basic in pH, found in amino acids, contain nitrogen, they r nonpolar, components of urea = i think it is the last one but not sure
2.) an example of a hydrogen bond is the bond between?
the H of one water molecule and the O of another molecule, Mg+ and Cl- in MgCl2, Na+ and Cl- in salt, two hydogen atoms in a molecule of hydrogen gas H2, C and H in methane CH4
3.) which of the following is possible due to high surface tension of water?
lakes dont freeze solid in winterdespite low temperatures, organisms resist temperature change although they give off heat due to chemical reactions, the pH of water remains exactly neutral, water can act as a solvent, a water strider can walk across the surface of a small pond
4.)what statement is completely correct?
H2CO3 is a weak acid and NaOH is a weak base, H2CO3 is a strong acid and NaOH is a strong base, NH3 weak base & HCI strong acid, NH3 weak base & H2CO3 strong acid

2007-02-07 07:59:24 · 5 answers · asked by MANA 1

My friends girlfriend is going under the knife to have them removed.

2007-02-07 07:56:08 · 6 answers · asked by bobo 1

And why does Homer Simpson often act in ways that are disturbingly simian? He he he.

2007-02-07 07:51:35 · 8 answers · asked by Anonymous

2007-02-07 07:27:31 · 4 answers · asked by mildew 3

I have got to write up about Protein Digestion and the problems associated and how the problems are overcome.

Please help if you can!!!

Thanks

2007-02-07 07:09:37 · 6 answers · asked by Paul C 6

What is the only amine hormone that acts like a steroid? Thanks.

2007-02-07 06:55:26 · 2 answers · asked by Toothie 2

2007-02-07 06:50:29 · 4 answers · asked by Anonymous

this is for biology class when i say sample i mean whatever ist is that you want to look at

2007-02-07 06:46:34 · 7 answers · asked by aayanna24 2

does time controls us or we control the time?
#does going queqly in time make us realizing better?

2007-02-07 06:40:28 · 3 answers · asked by lora a 1

and what does that difference tell you of the activity of food production in the onion cell?

2007-02-07 06:33:02 · 4 answers · asked by maureen k 1

2007-02-07 06:31:48 · 2 answers · asked by maureen k 1

I heard some geneticists on the radio talking about dramatic life extention therapy and it sounded interestin, complex, but interesting...

2007-02-07 06:06:36 · 2 answers · asked by Juan 1

2007-02-07 05:48:08 · 4 answers · asked by Jennifer B 2

Let's say you have a father who is black-haired and a mother who is blonde. The couple has four children...would it be possible (or probable) for three children to turn out blonde and only one to turn out black-haired?

2007-02-07 05:46:36 · 6 answers · asked by ♥ 3

Thanks for the help!

2007-02-07 05:46:14 · 8 answers · asked by Nerds Rule! 6

2007-02-07 05:42:11 · 6 answers · asked by Roland 4

A.RNA polymerase is transcribing the genes since lactose is present.

B.Since lactose is present, the repressor protein will begin transcription.

C.Since lactose is absent, the repressor protein is blocking the genes and stopping transcription.

D.The cell continually produces the enzymes needed to break down lactose.

2007-02-07 05:18:51 · 2 answers · asked by live~laugh~love 1

Descibe how the lac operon functions, and explain how it permits E. coli to produce the enzymes needed to break down lactose when it is present in the bacterium.

2007-02-07 05:09:37 · 3 answers · asked by live~laugh~love 1

A.The repressor protein falls off the DNA molecule, and RNA polymerase binds to the promoter. B.The repressor protein binds to the DNA molecule, and RNA polymerase falls off. C.Lactose is removed from the system. D.The repressor protein binds to the promoter sequence.

2007-02-07 05:03:45 · 2 answers · asked by live~laugh~love 1

i dont know if a person race can be identified just looking at some genetic sample . however i would like to know if heaven forbid one day it would be possible for someone to use some sort of genetic weapon that would only harm one race. is that remotley possible now or in the near future. if not when if ever could this idea become the real thing

2007-02-07 04:48:01 · 3 answers · asked by Anonymous

do you ever think that humans will evolve to where we never need sleep again. i know more and more people are getting less and less sleep now adays. also there are people now that can only sleep for a few hours with days on end (the coach for the tampa bay bucs is a great example). i know people need sleep to repair their bodies, but if we are getting less sleep now, is it possible for us to evolve to the point to where we wont need sleep at all?

2007-02-07 04:39:09 · 10 answers · asked by Anonymous

2007-02-07 04:33:06 · 2 answers · asked by chaunceyd06 1

2007-02-07 04:32:19 · 9 answers · asked by Anonymous

1.Which of the following statements is correct?

A. Your eyes look different than your liver because the cells that make up these organs have different genes.
B. As cells and tissues differentiate, they lose the genes they do not need.
C. All cells have the same genes, but different genes are active in different cells.
D. All cells have the same genes, and all of a cell's genes are active at the same time.

2.Which of the following clues would tell you if the lac operon is on?

A. Lactose is absent.
B. The repressor protein has fallen off the molecule.
C. RNA polymerase is blocked by the repressor.
D. The cell membrane changes.

2007-02-07 04:30:21 · 4 answers · asked by Anonymous

science believe that every part in our body has some reason for it to being here then if science does not believe in horoscopes [ jyotishi vigyan ] or something like that ..... then i want answer in a scientific way that y lines [rekhayein ] r there in hands in every human body ?

2007-02-07 04:29:35 · 9 answers · asked by Amy 2

Is it because they don't believe in God?

2007-02-07 04:21:59 · 18 answers · asked by Anonymous

2007-02-07 04:08:57 · 4 answers · asked by Anonymous

I had a lab in Bio the other day and we were unable to complete the lab, I can't find this answer anywhere. Explain why a 0.87% sakube was used with human epithelial cells instead of tap water. Whats the possible answer to that?

2007-02-07 04:07:30 · 5 answers · asked by Anonymous

2007-02-07 03:51:07 · 1 answers · asked by wheelyqueen 1

Assuming we have 1000 DNA residues at random, after time deltaT the sequences dffer from the original in 33% of the sites. Assuming that the sequence evolves under Jukes-Cantor, what is the expected number of substitutions per site? When deltaT becomes very large (infinity), how many sites will on average have the same nucleotide?

2007-02-07 03:34:33 · 1 answers · asked by motobecane 2