Outside a cell, viruses are
A. running a small number of biochemical reactions.
B. synthesizing proteins necessary for entry into the host.
C. inactive.
D. constructing a cell membrane known as an envelope.
E. running a small number of biochemical reactions AND synthesizing proteins necessary for entry into the host.
C
You might also like to view...
A chromosome with two arms of similar length is referred to as
A) acrocentric. B) homologous. C) telocentric. D) metazoan. E) metacentric.
Chytridiomycetes produce enzymes that digest cellulose, chitin, and similar molecules. These fungi are contributing to the decline of amphibians worldwide through what mechanism?
A. by digesting cellulose in the cell wall of the frog's cells B. by digesting chitin in the cell wall of the frog's cells C. by infecting their lungs D. by killing their eggs in the water E. by digesting keratin in the frog's skin
Which of the following is false about the E. coli Lac operon?
A. it is an example of negative control B. the presence of lactose acts as an inducer C. the repressor binds to the operator D. the mRNA for the receptor binds to the operator
Many psychoactive drugs affect the
a. thalamus. b. pituitary gland. c. pineal body. d. hypothalamus. e. corpora quadrigemina.