Which of the following membrane activities does NOT require the expenditure of energy by the cell?

a. active transport
b. osmosis
c. endocytosis
d. exocytosis
e. synthesis of more membrane


B

Biology & Microbiology

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For each tissue type below, choose the type of organism that it is found in: a. animal b. plant

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Biology & Microbiology

The human immunodeficiency virus (HIV) uses RNA, rather than DNA, to encode genetic information. During infection, however, HIV uses an enzyme known as reverse transcriptase to generate double-stranded DNA. Generally speaking, how would the enzyme generate a double strand of DNA from a single strand of RNA?

A. Reverse transcriptase first catalyzes the synthesis of a RNA copy from the viral DNA, and then catalyzes the synthesis of a second strand of DNA complementary to the first one. B. Reverse transcriptase first catalyzes the synthesis of a DNA copy from the viral RNA, and then catalyzes the synthesis of a second strand of DNA complementary to the first one. C. Reverse transcriptase first catalyzes the synthesis of a DNA copy from the viral RNA, and then catalyzes the synthesis of a second strand of DNA from the viral RNA.

Biology & Microbiology

Drosophila melanogaster is a suitable research subject for developmental genetics studies because:a

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Biology & Microbiology

The respiratory centers that control ventilation of the lungs in mammals are located in the

A. brainstem. B. hypothalamus. C. cerebral cortex. D. bronchi. E. neck.

Biology & Microbiology