Biology - January 2007

i cant figure out what they do to help cells. do they help pass energy or what?

2007-01-10 03:21:17 · 2 answers · asked by babbsie_101 2

How many Combinations of human DNA are there? I.e. how many templates of humans can be created? What is the chance that a another human can exist with identical DNA?
If the entire population of humans that have ever existed are taken to account, can there have possibly been an identical "me" ever in history?
(Obviously we disregard identical twins in this query)

2007-01-10 03:07:11 · 8 answers · asked by AD 1

i need some help i am usually really good at biology but one thing i do not understan are these punnett squares.THANKS! :)

Refer to the following information to answer Questions 4 through 7.A horticulturalist wants to produce geraniums with specific characteristics. She knows that the trait of red flowers is governed by the allele R (RR and Rr) and the trait of white flowers is governed by the allele r (rr).

1. The horticulturalist plans to cross a geranium that is true-breeding for red flowers with a geranium that is true-breeding for white flowers. What would this Punnett square look like.

2. The horticulturalist crosses two geraniums from the F1 generation. Look at the Punnett square to see this cross. What ratio of red- to white-flowering plants would you expect to see in the phenotypes of the F2 generation?
A. 1 red: 3 white
B. 3 red: 1 white
C. 2 red: 2 white
D. all red
the punnett square looks like this
R r

R RR Rr

r Rr rr

2007-01-10 02:58:51 · 2 answers · asked by Anonymous

In my exam today, there was a question that asked you to list five organelles in the order that they would be separated during differential centrifugation. I knew the others, but was confused between the nucleus and cell wall. Anyone know which is separated first?

2007-01-10 02:56:39 · 3 answers · asked by lykastar 3

2007-01-10 02:43:59 · 12 answers · asked by munirlutfi 1

2007-01-10 02:38:40 · 3 answers · asked by sishkage 1

Does anyone who is working with these cells have any references for them??
In my experiments I have two batches one is actively growing and one is in the G0 phase of the cell cycle, I damage both with peroxide and leave to grow, to see if the phase of growth corresponds to the damage caused??
any help would be much appreciated.

2007-01-10 02:38:29 · 2 answers · asked by SANDIE 2

How might this record be different if humans had air sacs like birds do? Discuss the changes that would occur in human lungs and the respiration process in your explanation.

2007-01-10 02:27:50 · 4 answers · asked by Anonymous

I read an article about how a harmless strain of the bactierium Vibrio cholerae was forceably changed by a bacteriophage to a become highly virulent one that causes cholera.

Is this an example of forced evolution?

2007-01-10 02:19:20 · 3 answers · asked by Anonymous

2007-01-10 02:14:28 · 1 answers · asked by x_code80 1

Okay I so hate this part of biology and i have read everything that i am suppose to and i dont get punnett squares. please HELP!! Thanks


use this chart to answer the question
phenotypes and genotypes of blood types.

left side of chart
Blood type and allele
A (l^a)
B (l^b)
AB (l^al^b)
O (l)

Right side of chart
Possible genotypes and alleles
AA or AO (l^al^a or l^al)
BB or BO (l^bl^b or l^bl)
AB (l^al^b)
00

1. Jessica's mother has the blood type AB and her father has the blood type O. Which blood type could Jessica have? Draw a Punnett square if needed.
A. A
B. AB
C. O

2.Which type of inheritance pattern governs the blood types in Jessica's family?
A. codominance
B. dominant and recessive inheritance
C. sex-linked characteristics
D. incomplete inheritance



THANKS SO MUCH!!!

2007-01-10 02:05:55 · 1 answers · asked by Anonymous

2007-01-10 02:03:22 · 2 answers · asked by shigure 1

2007-01-10 01:18:25 · 2 answers · asked by Jonathan 2

2007-01-10 01:08:45 · 5 answers · asked by black owl 2

i want a specefic answer

2007-01-10 00:59:20 · 13 answers · asked by Ashi 1

2007-01-10 00:54:09 · 6 answers · asked by Ashi 1

please tell me by friday a list of extinct plants and animals for my biology and why they became extinct! thank u!

2007-01-10 00:40:23 · 4 answers · asked by CuteDimmy 1

2007-01-10 00:37:30 · 17 answers · asked by *~*Sarah*~* 2

Some say zero, some say 9 months.I just want an accurate reading of the chronological age of a human being when he/she is born.

2007-01-10 00:34:27 · 22 answers · asked by Shanil 2

deriving the fact from evolution, if the man will evolve, don't you think the aliens are the next in line? although we have no scientific proof for aliens if they really exist, by applying the laws of evolution, is it possible that an evolved man will became a living one with a height of only 3 feet, 6 fingers (3 each hand), big brainy head, bright skin, big round eyes, and have telekinetic powers?

2007-01-10 00:32:51 · 13 answers · asked by =!i-†Cliyo12†-i!= 1

2007-01-10 00:32:16 · 7 answers · asked by Anonymous

How to pfeisteria reproduce? I havent been able to find ANYTHING on pfeisteria.

2007-01-10 00:28:26 · 2 answers · asked by Mike A 3

after having ingested 2 1/2 KFC bowls?

2007-01-10 00:26:33 · 5 answers · asked by Joni J 6

2007-01-09 23:39:48 · 1 answers · asked by ginie 1

Scientifically, how do people get dimples?? What is different in their body than to peole who don't have dimples? What causes dimples when a person smiles??

2007-01-09 23:33:48 · 5 answers · asked by Anonymous

does a body decay when buried in concrete or is it preserved as nothing can invade it ?

2007-01-09 23:14:50 · 13 answers · asked by Anonymous

does a body decay when buried in concrete or is it preserved as nothing can invade it ?

2007-01-09 23:07:42 · 6 answers · asked by Anonymous

2007-01-09 22:47:56 · 7 answers · asked by saharen beauty 2

Blu-tac is smurf poo and blue ink biros made of their blood and urine! what other everyday objects are made from little criters and tv/film characters?

2007-01-09 22:42:08 · 4 answers · asked by DAZ4518 5

2007-01-09 22:25:02 · 7 answers · asked by Anonymous