1)Suppose a researcher for a pest-control company developed a chemical that inhi

Question

1)Suppose a researcher for a pest-control company developed a chemical that inhibited the development of an embryonic mosquito’s endodermal cells. Which of the following would be a likely mechanism by which this pesticide works?

A. The mosquito would develop a weakened exoskeleton that would make it vulnerable to trauma.

B. The mosquito would have trouble digesting food, due to impaired gut function.

C. The mosquito would have trouble with respiration and circulation, due to impaired muscle function.

D. The mosquito wouldn't be affected at all.

2)You find what you believe is a new species of animal. Which of the following characteristics would enable you to argue that it is more closely related to a flatworm than it is to a roundworm?

A. It has a cuticle that it sheds in order to grow.

B. Its larvae have cilia that they use for feeding and locomotion.

C. It is shaped like a worm.

D. It has a well-developed coelom.

3)In a tide pool, a student encounters an organism with a hard outer covering that contains much calcium carbonate, an open circulatory system, and gills. The organism could potentially be a crab, a shrimp, a barnacle, or a bivalve. The presence of which of the following structures would allow for the most certain identification of the organism?

A. a mantle

B. a heart

C. a filter-feeding apparatus

D. eyes

4) The heartworms that can accumulate within the hearts of dogs and other mammals have a pseudocoelom, an alimentary canal, and an outer covering that is occasionally shed. To which phylum does the heartworm belong?

A. Platyhelminthes

B. Arthropoda

C. Nematoda

D. Annelida

5) The common ancestor of the protostomes had a coelom. What does this suggest?

A. All lophotrochozoans have a coelom.

B. There are no pseudocoelomates within the protostomes.

C. There are no acoelomates within the protostomes.

D. The body cavity evolved before the lophophore.

6) Refer to the figure below. Suppose new molecular analyses indicated that the phylum Annelida had diverged from the arthropod lineage after Onychophora and Tardigrada. What would this imply about protostome evolution?

A. The annelid lineage gained and then lost the ability to molt.

B. The annelid lineage gained and then lost jointed limbs.

C. Segmentation evolved only once within protostomes; the annelid lineage gained and then lost the ability to molt.

D. Segmentation evolved only once within protostomes; the annelid lineage gained and then lost jointed limbs.

Explanation / Answer

Answers:
1.
B) The mosquito would have trouble digesting food, due to impaired gut function.

2.
I'm pretty sure that the answer is "It's larvae have cilia that they use for feeding and locomotion"

Embryonic stages and processes tend to be similar for species in the same family, due to the fact that mutations have difficulty in being passed on since natural selection comes before reproduction.

3.
A)

4. The heartworms that can accumulate within the hearts of dogs and other mammals have a pseudocoelom, an alimentary canal, and an outer covering that is occasionally shed. To which phylum does the heartworm belong?

C) Nematoda

5.

D) The body cavity evolved before the lophophore.

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