The main osmoregulatory and excretory organ in most vertebrates is the:a

skin.
b. gill.
c. metanephridium.
d. lung.
e. kidney.


e

Biology & Microbiology

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Components typical of plant cells but not of animal cells are

(a) nuclei. (b) cell walls. (c) mitochondria. (d) ribosomes.

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The histocompatibility complex proteins function in

A. antibody proliferation. B. B cell maturation. C. recognition of self. D. T cell maturation.

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Which one of the following is a symptom of botulism?

A) elevated stroke volume B) paralysis of muscles used for breathing C) cough yielding green phlegm D) immune system attack of connective tissue E) rash

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During DNA replication, all of the following proteins are important for separating the DNA strands and allowing movement of the replication fork EXCEPT

A. helicase. B. both helicase and topoisomerase. C. DNA polymerase. D. topoisomerase. E. single-stranded binding proteins.

Biology & Microbiology