Biology - May 2007

If we have all these theories about how life started than have scientists recreated the origins of life in a lab? i've heard that amino acids were formed together and all sorts of stuff happened to create life from inanimate chemicals etc. but if thats true than we should be able to duplicate that. have we? if not than why?

2007-05-12 21:00:50 · 4 answers · asked by Anonymous

2007-05-12 20:59:04 · 6 answers · asked by hairy armpits 2

How many chromatids does a normal human skin cell have during prophase of mitosis?

A. 23
B. 46
C. 92
D. 46 or 92, depending on whether it’s early or late prophase
E. 0

Could you also give me a percentage% of how sure you are? Thank You Very Much.

2007-05-12 20:55:06 · 3 answers · asked by Anonymous

One member of a homologous chromosome pair carries alleles A and b, while the other member carries a and B. If crossing over occurs between these genes, the parental type gametes will have the genotypes ________, while the recombinant gametes will have the genotypes ________.

A. Ab and aB; AB and ab
B. AB and ab; Ab and aB
C. A and b; a and B
D. AB and aB; Ab and ab
E. A and a; B and b

Could you also please give a percentage% of how sure you are. Thank You

2007-05-12 20:53:21 · 2 answers · asked by Anonymous

2007-05-12 20:19:39 · 3 answers · asked by juju 1

Or just those cells of organs that are related somehow to sexual phenotype (primary , secondary sexual charecteristics) ?
In other words , can some types of cells be normal and viable WITHOUT the sex chromosomes (for example if one is considering producing cells or tissue independent of a complete body, e.g a liver or a piece of skin ) ?

2007-05-12 19:50:44 · 6 answers · asked by shogunly 5

what part and why ?

2007-05-12 19:45:08 · 4 answers · asked by Nini 1

can any one give me "Classificatioon of epithelial cells and some examples of how structure relates to function.

2007-05-12 19:43:52 · 2 answers · asked by Nini 1

2007-05-12 19:43:29 · 2 answers · asked by Anonymous

2007-05-12 19:23:49 · 5 answers · asked by Melanie 5

Well that is the wrong way to put it! I know where it is located. But will someone come up with a educated sentence of where is is located. Like start it off with
The Urinary system is located in the ......
Please hurry this is for a science project and i really want to get done. Thankyou so much!

2007-05-12 18:47:32 · 6 answers · asked by cne 1

if i was standing on earth at sea level and there was only 1% of the air pressure there is right now at that level what would happen to me pysiologically i know that you would die but i wanna know how exactly.

2007-05-12 18:31:31 · 4 answers · asked by Anonymous

2007-05-12 18:29:55 · 5 answers · asked by kim r 1

I am not asking about how increasing the substrate amoung speeds up the reaction caused by an enzyme, until saturation of active site is reached and rate of reaction is the same. In the first part, when the rate is linear, going upward, and Im comparing different rates of different substrate amounts. So I have a graph with rate of reaction in different substrates. should that be linear? thank you

2007-05-12 17:47:18 · 1 answers · asked by Leo L 2

Please help!!

2007-05-12 17:36:31 · 2 answers · asked by Anonymous

desperate to know! please :)

2007-05-12 17:34:39 · 3 answers · asked by Anonymous

2007-05-12 17:01:02 · 3 answers · asked by Arpita G 1

This relates to a Daphnia experiment. What would be the answer from a biochemical point of view?

2007-05-12 16:59:46 · 3 answers · asked by Arpita G 1

2007-05-12 16:13:25 · 1 answers · asked by Anonymous

Why in the grand experiment of evolution hasn't immortality evolved? Why has survival of the species taken priority over survival of the individual? Does the advantage of genetic diversity alone account for this bias for survival of the collective?

2007-05-12 15:20:19 · 9 answers · asked by loudwalker 2

2007-05-12 12:48:46 · 2 answers · asked by villaincognito 1

I understand that lacrimal fluid flows from the lacrimal gland positioned on the lateral orbital region of the eye to the excretory lacrimal ducts which transmit tears across the eye surface. These tears (lacrimal fluids) then collect into medial little holes called the lacrimal puncta and then flow into the lacrimal canaliculus to the lacrimal sac and then drain into the nasolacrimal duct.
So then, it seems that this flow of lacrimal secretion/fluid increases substantially in the lacrimal gland where it then oozes out to flow in the rest of its path. Am I right in assuming this? So, then, why does being upset/highly emotional increase lacrimal secretion in the lacrimal glands above the eyes?

2007-05-12 12:42:28 · 4 answers · asked by Rosabelle Winters 1

2007-05-12 08:39:37 · 1 answers · asked by ♕ TOP Fitnah Slayer 1

2007-05-12 08:28:24 · 9 answers · asked by Anonymous

a. seminal vesicles
b. prostate glands
c. bulbourethral glands
d. epididymus

2007-05-12 07:49:27 · 3 answers · asked by ellis45011 1

Fertilization of human eggs most often takes place in the___
A. ovary
b. uterus
c. oviduct

Which of the following does not contain or consist of connective tissue?
A. bone
B. intesitnal lining
C. lymph
D. skin
E. tendons


The oxygen content of hemoglobin would be greatest in capilliaries leaving the___
would it be small intestine?

2007-05-12 07:45:40 · 3 answers · asked by Anonymous

2007-05-12 07:40:09 · 6 answers · asked by kiki c 1

2007-05-12 07:34:53 · 4 answers · asked by Anonymous

Blood enters the lungs from which chamber of the heart?

a-Right atrium
b-Left atrium
c-Right ventricle
d-Left ventricle




It is not easy to observe individual chromosomes during the interphase because:

a-the DNA has not been duplicated yet.
b-they have uncoiled to form long, thin strands.
c-they leave the nucleus and are scattered throughout the cell.
d-homologous chromosomes do not pair up until division starts.

2007-05-12 07:12:37 · 4 answers · asked by Frances P 2

The length of the chromosome

The position of the centromere of the chromosomes

The pattern of bands on the chromosome

The position of the chromosome on the spindle

2007-05-12 06:18:34 · 2 answers · asked by Dave Angel 1