Biology - December 2007

2007-12-15 16:57:37 · 9 answers · asked by Y.S.C B 2

2007-12-15 16:52:02 · 0 answers · asked by Anonymous

1. DNA polymerase adds complementary base pairs to each strand of DNA
2. DNA polymerase "proofreads" the molecule to make sure that each molecule is a perfect copy of the original DNA.
3. DNA is "unzipped" as the hydrogen bonds between base pairs are broken and two molecules of DNA separate.

2007-12-15 16:38:30 · 2 answers · asked by Anonymous

with SOURCE/S to prove your answer :) thanksss

2007-12-15 16:33:29 · 3 answers · asked by ilovepink 2

2007-12-15 16:06:35 · 3 answers · asked by upaliwickramathilaka 2

hdl's and ldl's both have a specific function in the body. when stressed the body sends adrenaline, and ldl's... to be sent to the limbs for fight or flight. and hdl to go and retrieve the cholestrol deposit and carry back to the liver. being we are in situations where we can not fight or flight, ldl deposits cholesterol in the arteries to use up. the hdl's can only carry so much, the rest settle in the arteries. this is how the body was meant to function. so once more, how can it be called, "good and bad" cholesterol?

2007-12-15 15:59:00 · 4 answers · asked by darksmoke 1

for example, crossing four traits in a punnett square, those kind of stuff...

2007-12-15 15:50:25 · 6 answers · asked by franz26 2

can you pleease provide me with an example for each? Thanks!!

2007-12-15 15:38:16 · 3 answers · asked by Anonymous

whats the difference and simularities!!!!!!!!!!!!!

2007-12-15 15:31:44 · 7 answers · asked by DO WORK SON!!!!! 1

thanks.

2007-12-15 15:24:40 · 4 answers · asked by Anonymous

Knowing this, how do you match this type of movment across a cell membrane to its definition:

1._____Diffusion
2._____Osmosis
3._____Facilitated diffusion
4.____Active transport

a. Diffusion of molecules through a protein channel
b. diffusion of water through a membrane
c. movement of molecules to achieve equilibrium
d. movement of molecules against a concentration

2007-12-15 15:22:27 · 9 answers · asked by Anonymous

In my book, it says that one strand of a DNA molecule can serve as a template for missing a new complementary strand. What does this mean? I know that hydrogen bonds hold the nitrogenous bases together, and covalent bonds between sugar and phosphate groups on the outside handrail of the ladder hold the chains together. However, I have no idea what the defintion of template means in this context.

Also, there was a question on my study guide:

The primary function of DNA in cells is to:

a. serve as a storage form for unused nucleotides
b. occupy space in the nucleus to keep the nucleus from collapsing
c. store information that tells the cells which proteins to make
d. serve as a template for making long, spiral carbohydrates.

I chose C, because it is the only one that makes sense, but choice D bothers me even though I don't think they make spiral carbohydrates. The template word is just so ambiguous in my mind.

Help would be much appreciated.

2007-12-15 15:18:22 · 8 answers · asked by Anonymous

2007-12-15 15:06:52 · 11 answers · asked by summi 2

Knowing this, how do you match these functions:

1._____Allows materials in and out of a cell
2.______contains water, nutriets and waste
3.______controls cell activities
4.______synthesizes proteins
5.______packages proteins
6.______synthesizes lipids
7. ______synthesizes sugar from sunlight in autotrophs
8.______ Make energy the cell can use
9. ______contains the organelles
10. ______Transports proteins
11. _______Supports and protects plant cells
12. ________Cellular digestion

a. Nucleus c. Rough ER e. cytoplasm
b. cell membrane d. Ribosome f. lysosome
g. Golgi apparatus h. Chloroplast I. Vacuole
J. Smooth ER k. Mitochondria L. Cell Wall

2007-12-15 15:03:22 · 12 answers · asked by Anonymous

I've been thinking a half-cracked egg, plastic egg.
i also need to poke holes in it for a nuclear pore so it must be strong enough..
any ideas would be helpful!

2007-12-15 14:57:27 · 4 answers · asked by Anonymous

Knowing this, how do you match these macromolecules to their monomers:

1. _____Carbohydrates
2.______ Protein
3.______lipids
4.______nucleic acids

a. amino acids
b. fatty acids and glycerol
c. nucleotides
d. sugar

CSN YOU PLEASE GIVE ME AN EXAMPLE OF EACH SO THAT I CAN UNDERSTAND? THANKS!!

2007-12-15 14:55:27 · 10 answers · asked by Anonymous

I just finished watching a DVD called "Cracking the Code of Life", and in one part, a scientist told the interviewer that only 1.5% of human DNA is genes, and the other 98.5% is useless DNA that have survived since the beginning of life and are just hitchhiking on our bodies. Is that true?

2007-12-15 14:53:23 · 17 answers · asked by Anonymous

You see, I was teaching some kids, and they asked me this question. So is a bean a living thing?

2007-12-15 13:54:58 · 15 answers · asked by oneway1106 1

2007-12-15 13:27:59 · 5 answers · asked by doubleyou93 1

Describe the point at which glucose is completely oxidized during cellular respiration.

Is it the Citric Acid Cycle (Krebs Cycle) or the Electron Transport Chain (ETC), and why?

2007-12-15 13:16:24 · 2 answers · asked by goldigga 2

(2. how does the pressure of blood in the arteries affect the flow of blood from the heart to the tissues?


10points is yours.

2007-12-15 12:57:00 · 2 answers · asked by Anonymous

2007-12-15 12:43:11 · 4 answers · asked by future 1

human embryos. which one would you save if you had time to save one? what is the morally correct decision and why?

2007-12-15 12:42:01 · 5 answers · asked by stephanie 1

2007-12-15 12:13:20 · 2 answers · asked by Anonymous

(Come on people, you don't need details.)

2007-12-15 12:04:45 · 6 answers · asked by snarky_sheep 1

Example: After humans drifted from their closest relatives, chimpanzees, the males began loosing the baculum, and started depending on blood pressure to get an erection.
According to Richard Dawkins, this was due to a "sexual selection" from females because an erection having an hydraulic mechanism in the penis would mean that the individual has good blood pressure, and doesn't have stress or other mental issues. How did early female humans "chose" the me until they lost the baculum, without showing purpose (remember that evolution is not driven by purpose)?

2007-12-15 11:55:43 · 3 answers · asked by Optimus Prime 4

I am by NO means an expert in genitics but this would make a really cool ( deadly too ) creature

2007-12-15 11:09:04 · 7 answers · asked by Anonymous

My crazy relative is trying to prove she is the illegitimate child of my paternal uncle (as well as my maternal half-sister). She talked an equally nutty relative (my uncle's legitimate daughter) into doing DNA test. The result was (according to them) that there is a 17% likelihood of their being related. Everyone involved is of the same ethnicity and national origin.

Am I right in understanding that this result is essentially "random"?

Please -- I am looking for a serious scientific answer. This is not a joke, and the accusation is very hurtful to my uncle's widow, who is over 80.

2007-12-15 11:02:14 · 9 answers · asked by Lisa B 7

2007-12-15 10:50:39 · 7 answers · asked by dude 1

Is the concentration of DNA constant for different body cells of the same species?

2007-12-15 09:55:46 · 3 answers · asked by HBK 2