Several Biology Questions?

Question

A mutation is a change in:
a. homeostasis
b. metabolism
c. heredity instructions
d. none of the above

Backflow of blood is prevented in the veins by:
a. muscular contractions inside the vein walls
b. shunting of blood around organs
c. small valves located in the veins
d. increasing pressure in the capillaries

The smallest air tubes that lead directly to the air sacs are called:
a. bronchi
b. trachea
c. bronchioles
d. diaphragm

This type of respiratory strategy involves openings (called spiracles) in the exoskeleton leading to tubes in the body called:
a. tracheae
b. gills
c. lungs
d. body surface

Genetic drift is most pronounced in a population that is:
a. large
b. extinct
c. small
d. highly heterozygous

Answer them all correctly - you get best answer
can't answer them all just take a stab at them and maybe you'll get best answer.

no one was all the way correct so I had to give points to who was close.

Answer 1

Mutation C, Backflow C, Smallest C, Respiratory B, Genetic C

Answer 2

Mutation: c: Heriditary instructions
Blood: a. Muscular contractions inside the vein walls
Smallest air tubes: c. Bronchioles
Spiracles: d. body surface
Genetic Drift: d. Highly heterozygous

Answer 3

1) C
Mutation: A change in the DNA of a gene, ultimately creating genetic diversity.
2) Definitely C
3) A
4) I'm guessing gills
5)Genetic drift is by chance. Like something unpredictable. So it would be large population.

This is what my book says: Unpredictable fluctuation in allele frequencies from one generation to the next because of a population's finite size.


sorry about 4. I'm not there yet. I'm taking AP bio and we're studying plants right now.

Answer 4

C
C
C
dunno
dunno

Answer 5

c, c, c, ?, ? I'm positive on the 1st three.

Answer 6

could the answer be.........."C"?

Answer 7

c, c, a, d?, c