Lobsters and clams have _____ in common with fishes

a. external gills
b. a two-chambered heart
c. internal gills
d. skin as a respiratory surface
e. an open circulatory system


ANSWER: c

Biology & Microbiology

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An epidemic is

A. a disease that maintains a steady low-level frequency. B. a sudden increase in the occurrence of a disease above the expected level. C. a sudden unexpected occurrence of a disease in a limited segment of a population. D. when a disease occurs occasionally and at erratic intervals in the human population.

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Which of the following has an anticodon to bind to the protein synthesizing machinery?

a. DNA b. mRNA c. rRNA d. tRNA e. none of these

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All organisms fit into one of the two following

categories.

a. consumers and decomposers b. producers and decomposers c. producers and consumers d. scavengers and detritivores e. consumers and scavengers

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Suppose you are examining the processes of muscle contraction in fishes. What type of study is this an example of?

a. an ecological study b. an anatomical study c. a taxonomic study d. a physiological study

Biology & Microbiology