Biology - November 2007

2007-11-01 16:02:41 · 3 answers · asked by ashgirl 1

Ribosomes are cellular structures that assemble large protein molecules from smaller amino acid molecules.

2007-11-01 15:56:39 · 6 answers · asked by Sarah T 1

I really need this question answered. Im completly stumped and cannot find the answer in my reading material provided by my teacher. thanks a bunch

2007-11-01 15:54:44 · 4 answers · asked by Brit brit_crombie 1

so hypotonic is when there is a greater concentrarion outside the cell and hypertonic is when there is a greater concentration in the cell. we recently did a lab that show the shrinking and swelling of celery cells in the 2 solutions. i have to explain why the mass of one increased and the other decreased. i know it has to do with osmosis but i just can't seem to understand how to word it.

2007-11-01 15:49:58 · 3 answers · asked by antioxidant 2

ok i have 2 questions from my bio assignment...
a) what factors limit the size of a cell?
b) How can cells change to overcome this size limitation?
help would be greatly appreciated!!! thanx!!!

2007-11-01 15:39:55 · 4 answers · asked by Anonymous

Which of the following organelles is found in plant cells but not in animal cells?

nucleus
mitochondorion
chloroplast
golgi appartatus

the end products of photosynthesis include
carbon dioxide and water
sugars
carbon dioxide and oxygen
oxygen and water


A cell that contains a cell wall, chloroplasts, and a central vacuole is a
plant cell
animal cell
prokaryotic cell
bacterial cell


a central vacuole forms from
chloroplasts
fusion of amyloplasts
the fusion of smaller vacuoles
products of photosynthesis


Where are thylakoids located?

2007-11-01 15:39:04 · 3 answers · asked by Cross 2

2007-11-01 15:31:25 · 4 answers · asked by Anonymous

is it the excretory or circulatory?

2007-11-01 15:30:12 · 3 answers · asked by antioxidant 2

how do limiting factors affect populations?

2007-11-01 14:47:19 · 2 answers · asked by A girl 2

I've heard alot of noise about there being no (or very few) transitional fossils & about different species of hominids co-existing and therefore not being ancestors of one another and I am confused. I understand that micro-evolution(changes within in a given range in a particular species) is observable and repeatable, but macro-evolution (radical changes from one species to another) is not. We can't see it happen in the lab so we can't repeat it, it is a matter of history and therefore only proveable by the fossil record right?

So does the fossil record support it? I'm not trying to sound ignorant, I am not a Biologist, I work in Computer Science so this is not my strong point. I am hoping for intelligent answers.

2007-11-01 14:41:57 · 7 answers · asked by Anonymous

what is the purpose of a nucleus. any help is great!! thanks

2007-11-01 14:18:23 · 13 answers · asked by jessica p 1

what happens when light is present and absent when cells reproduce ATP from nutrients in the environment
(i have a couple of ideas, but anything else will help... thanks)

2007-11-01 13:58:00 · 1 answers · asked by krisden 2

2007-11-01 13:44:52 · 1 answers · asked by Anonymous

2007-11-01 13:02:22 · 1 answers · asked by Terri L 2

Should divers be allowed near coral reefs? Why?

Please explain in article form.

Most detailed answer gets best answer.

2007-11-01 12:56:48 · 4 answers · asked by JB 1

When giving blood, usually 1 pint.....how does your body know it's gone? Then how much to remake? When you fill a balloon with water and tie it off, if you take a pint from it there is no way to refill it. Nor does it know. So how does our heart know to produce blood or not? and How much?

2007-11-01 12:08:22 · 2 answers · asked by WAIGHT 4

explain ur reasons

2007-11-01 11:56:18 · 4 answers · asked by Anonymous

2007-11-01 11:47:36 · 1 answers · asked by Alexander 6

PlZ

2007-11-01 11:44:04 · 1 answers · asked by Anonymous

please help me

2007-11-01 11:39:52 · 2 answers · asked by Carly S 1

2007-11-01 11:27:24 · 2 answers · asked by Anonymous

My friend and I were wondering if someone with albinism can dye their hair, will the color hold?

2007-11-01 10:10:56 · 9 answers · asked by Eri 2

First I'm a Creationist because as a believer in a Divine Creator I accept that the Old Testament (Written and Oral Torah) are completely true and the word of G-d in both its deeper hidden meanings (yet to be discovered) and it's known meanings (already discovered by humans). I'm Jewish and accept the tenants of my religion without reservation even though I don't practice all aspects of my religion such as eating non Kosher food. My husband who is currently being trained in Infantry with the US Army and is the bravest man in the world (MY OPINION!!) and soon to be a father of the cutest little boy in the world (lol lol) doesn't have an opinion on Evolutionary Theory. I'm currently taking Biology and College Algebra (precalculus class) at a Community College. As a future Scientist and Mathematician (I love Math!! almost as much as my husband!!) I see Evolutionary Theory as some sort of voodoo that doesn't work and doesn't seem to lead to any practical applications.

2007-11-01 07:49:54 · 10 answers · asked by Anonymous

hydrogen bonds between adenine and thymine, or guanine and cytosine, from ______ ______ that join the two strands of the DNA double helix..........................ANSWER PLEASE!!

the supporting structure of the DNA double helix is called the sugar-phosphate_______...................ANSWER PLEASE!!

who identified DNA as the inheritance molecule?

what is a spooled string of genes packed in a single unit?

what is the smallest, membrane-bound protoplasmic body capable of independent reproduction?

PLEASE HELP! THIS IS DUE 2MORROW AT 8 AND I WOULD APPRECIATE UR HELP!!! =)

2007-11-01 07:44:07 · 2 answers · asked by TYL3R! 2

Since the human brain is so big - sometimes causing female pelvics to break while giving birth - wouldn`t natural selection work against humans evolving to have bigger brains?

Or are my facts all wrong? Let me know, this question comes from a gap in my understanding.

2007-11-01 07:30:35 · 9 answers · asked by Future 5

2007-11-01 07:22:02 · 1 answers · asked by Anonymous

If a stimulus on the receptor portion of a sensory neuron is above the threshold level, a further increase in the intensity of this stimulus will most likely cause the?

a. frequency of the impulse production to increase
b. strength of the neuronal impulse to increase
c. impulse to move faster
d. neuron membrane to become less permeable to sodium
e. neuron membrane to become more negatively polarized

2007-11-01 07:21:09 · 1 answers · asked by Anonymous

2007-11-01 07:20:13 · 1 answers · asked by Anonymous

2007-11-01 07:13:55 · 2 answers · asked by Jami 1

2007-11-01 07:13:04 · 4 answers · asked by Hannah J 1