Biology - December 2007

1. The condition in which there are barriers to inbreeding between individuals of the same species separated by apportion of a mountain range is referred to as
a. geographic isolation
b. reproductive isolation

2. A number of different phylogenies have been proposed by scientists over the decades. These are useful because they
a. predict which species will evolve the most quickly in the future
b. allow us to determine when two populations that are similar evolve into separate species
c. allow us to study evolutionary relationships and evaluate the relatedness of living organisms

3.The categories in which systematists place species, in order of increasing specificity are
a. species, genus, family, order, class, phylum, kingdom, domain
b. domain, kingdom, phylum, class, order, family, genus, species

4. Which of the following constitutes the smallest unit capable of evolution?
a. An individual
b. A group
c. A population
d. A clade
e. A community

any answers help!

2007-12-13 15:46:33 · 0 answers · asked by Hanna 2

what is the phenotype for ii?

when both alleles are expressed like red cow and white bull make a roan offspring?

chromosomes that do not determine sex care called?

The pictures of chromsomes showing the arrangement from largest to smaller is called?

what disorder causes the red blood cell to become bent and twisted?

what kind of traits are carried on the autosomes and may be influenced by sex hormones?

2007-12-13 15:32:32 · 1 answers · asked by Anonymous

Chap. 17 From Gene to Protein

Which of the following is not true of a codon?
a. It consists of three nucleotides
b.It may code for the same amino acid as another codon does.
c. It never codes for more than one amino acid
d. It extends from one end of a tRNA molecule
e. It is the basic unit of the genetic code

2007-12-13 15:21:33 · 2 answers · asked by rdz1645 2

What is the source of the electrons that will replace DPIP?What is the effect of darkness on the reduction of DPIP?
What resons can you give for the difference in the percentage of transmittance between the live chloroplasts that were incubated in the light and those that were kept in the dark?

2007-12-13 15:19:18 · 1 answers · asked by PB 1

what are the major elements found in living things?? Thank you!!! :)

2007-12-13 15:13:51 · 5 answers · asked by Anonymous

2007-12-13 15:03:34 · 6 answers · asked by imthefun1 1

2007-12-13 15:00:31 · 1 answers · asked by mamaH 1

Ok I have a biology midterm coming up and i have a couple questions.

1) What role does ATP play in cellular activites

2) If a cell were exposed to a poison that blocked the cell's ability to manufacture ATP, what effect would that have on the cell membrane's transport process?

3) How is ATP made in a light reaction?


Thank you so much for helping!!

2007-12-13 14:59:21 · 2 answers · asked by Anonymous

Gene S controls the sharpness of spines in a type of cactus. Cactuses with the dominant allele, S, have sharp spines, whereas homozygous recessive ss cactuses have dull spines. At the same time, a second gene, N, determines whether cactuses have spines. Homozygous recessive nn cactuses have no spines at all.

A cross between a true-breeding sharp-spined cactus and a spineless cactus would produce
A) all sharp-spined progeny.
B) 50% sharp-spined, 50% dull-spined progeny.
C) 25% sharp-spined, 50% dull-spined, 25% spineless progeny
D) all spineless progeny
E) It is impossible to determine the phenotypes of the progeny.

2007-12-13 14:53:06 · 3 answers · asked by kathy. 2

2007-12-13 14:48:16 · 2 answers · asked by jewmon55 1

2007-12-13 14:48:02 · 2 answers · asked by Anonymous

2007-12-13 14:39:55 · 3 answers · asked by Anonymous

First QUICK AND DECENT answer gets best.

2007-12-13 14:36:32 · 1 answers · asked by Sweez 3

What genotypes and phenotypes would be expected from the following cross??? () means its above previous letter

1. Cc(h) X c(ch)c
2. Cc X Cc(ch)
3. c(ch)c(h) X cc

Genotypes: Phenotypes:
CC, Cc(ch), Cc(h), Cc =Full Color
c(ch)c(ch), c(ch)c(h), c(ch)c =Chinchilla
c(h)c(h), c(h)c =Himilayan
cc =Albino
THANK YOU SOOO MUCH!! EXTRA POINTS TO THE PERSON WHO ANSWERS THEM ALL ACCURATELY, NOT THE FASTEST!!
<3

2007-12-13 14:36:13 · 1 answers · asked by Becky 2

Roads are sometimes salted to melt ice. What does this do to plants around the roadside and why?

If a shiwrecked crew drinks seawater, they will probably die. Why?

If a bowl of fresh strawberries is sprinkled with sugar, a few minutes later the berries are covered with juice. Why?

2007-12-13 14:32:33 · 2 answers · asked by dancinkitty0510 3

can anyone give me links to pictures of diagrams of the following protists plz?

Spirogyra

Oedegonium

Scendesmus

Amoeba

Euglena

Trypanosoma

Plasmodium

Paramecium

2007-12-13 14:28:34 · 3 answers · asked by Anonymous

2007-12-13 14:28:09 · 4 answers · asked by Jacob P 1

Skin color in a fish is inherited via a single gene with four different alleles. How many different types of gametes would be possible in this system?
A) 1
B) 2
C) 4
D) 8
E) 16

2007-12-13 14:27:14 · 3 answers · asked by kathy. 2

Why do grocery store owners spray fresh fruits and veggies with water?

2007-12-13 14:26:39 · 2 answers · asked by dancinkitty0510 3

A question for Biology class. Although optional, I urge you to be specific with details and factual and accurate information, PLEASE.

2007-12-13 14:22:47 · 15 answers · asked by TheRallyMunkee 2

1. define transcription
2. list 3 roles of RNA polymerasr in transcription
3.What basic principle ensures that the transcribed RNA molecule is carrying the right genetic message?

2007-12-13 14:22:26 · 1 answers · asked by ch@rlene 3

2007-12-13 14:21:04 · 8 answers · asked by zumitigger1 1

I need some help with biology/science questions you don't have to answer them all but at least some I will appreciate it or at least give me a website.


What occurs when 2 alleles produce 3 phenotypes?

whats form of a letter repersenting the reseccive trait?

What factors such as temperture and light that may affect the appearence of genetic information?

what experiment where the 2 parents differ by only 1 trait?

traits that are hidden in f1 generation but reappears in F2?


Thanks

2007-12-13 14:14:12 · 2 answers · asked by Anonymous

a. neurons
b. blodd
c. hormones
d. muscles
e. connective tissue

A and C are very possible. just wanna be sure which is the one. thank you

2007-12-13 14:13:37 · 4 answers · asked by Anonymous

2007-12-13 14:10:23 · 1 answers · asked by Anonymous

...and what structural features make this organ particularly well-suited for absorption of nutrients into the blood?

2007-12-13 14:09:48 · 4 answers · asked by ZZ 1

a. vascular
b. meristematic
c. protective
d. photosynthetic
e. all of these

2007-12-13 14:07:14 · 1 answers · asked by Anonymous

2007-12-13 14:03:25 · 1 answers · asked by Anonymous

2007-12-13 13:57:04 · 10 answers · asked by Sal M 2

2007-12-13 13:42:28 · 3 answers · asked by James Bond 3