Some fish have electroreceptors that detect weak electrical signals. The function of these electroreceptors is to:
A. avoid dangerous situations.
B. locate prey.
C. identify potential mates.
D. help photosensitive species avoid
excessive light.
B
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Which of the following tissue types is specialized to conduct electrical signals?
A. Nervous B. Muscle C. Epithelial D. Connective E. Both nervous and epithelial tissue are correct.
Some cancers can be considered to be multifactorial since both genes and environment are involved in
their expression. Indicate whether the statement is true or false.
When both lactose and glucose are available to E. coli, which part of the lac operon regulation assures that glucose will be metabolized first?
A) RNA polymerase transcribes the lac operon to make a single RNA molecule. B) The repressor binds to the operator in the absence of lactose. C) The repressor cannot bind to the operator in the presence of lactose. D) Permease allows lactose to enter the cell when lactose enters the cell. E) CAP binds to cAMP and then to the promoter only in the presence of low glucose.
The domain Eukarya contains ________ kingdom(s).
A. one B. five C. two D. four E. three