1. Phylogenetic tree is a diagram that indicates all except a. common ancestors

Question

1. Phylogenetic tree is a diagram that indicates all except

a. common ancestors

b. scientific hypothesis

c. lines of descent

d. point of divergence

e. nodes

2. One adaptation of insects not observed in other arthropods is

a. cephalization

b. hard exoskeletons

c. segmentation

d. specialized mouthparts

e. wings

3. Both smooth muscle fibers and cardiac muscle fibers:

a. have striations

b. are under involuntary control

c. are multinucleate

d. have a comparable intermediate resistance to fatigue

e. have a comparable intermediate speed of contraction

4. Which of the following is an example of positive feedback mechanisms?

a. increase in body temperature when exposed to cold

b. increased muscle contractions during labor

c. decreased insulin production in response to low blood sugar

d. increased respiration rate in response to decresed blood ph

e. both choices a and b are correct

5. Internal fertilization is more advantageous than external fertilization because it:

a. permits cross-species fertilization

b. is more open to chance

c. produce a motile egg

d. increases the life span of gametes

e. provides a protective environment for gamete fusion.

6. The first meiotic division accomplishes which of the following?

a. separaion of the centromere

b. separation of homologous chromosomes

c. formation of two daughter cells

d. separation of sister chromatids

e. both b and c are correct

7. In Drosophila, positional information for the development of the anterior, posterior sections of the fly is provided by the ratio of the concentration gradients of two pairs collectively known as:

a. adhesion molecules

b. progenitor cells

c. morphogens

d. cAMP

e. cadherins

8. In sea urchin, prevention of polyspermy is achieved by the fusion of the contents of corticol granules to form a

a. vitelline envelope

b. fertilization envelope

c. mucopolysachharide

d. acrosome vesical

e. both a and b are correct

9. Water is an important environmental factor to all living organisms. The water availability to any living oranisms is determined by:

a. water salinity

b. teh movement of water from high water concentration to low water concentration gradient

c. the amount of water in the envrionment

d. none of the above

Explanation / Answer

1. scientific hypothesis. Option b is correct.

2. wings. Option e is correct.

3. are under involuntary control, Option b is correct.

4. both choices a and b are correct. Option e is correct.

5. provides a protective environment for gamete fusion. Option e is correct.

6. both b and c are correct. Option e is correct.

7. morphogens. Option c is correct.

8. vitelline envelope. Option a is correct.

9. none of the above. Option d is correct.

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