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
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For each tissue type below, choose the type of organism that it is found in: a. animal b. plant
________ connective tissue ________ vascular tissue ________ dermal tissue ________ epithelial tissue ________ ground tissue _______ muscle tissue ________ nervous tissue What will be an ideal response?
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.
Drosophila melanogaster is a suitable research subject for developmental genetics studies because:a
the fly is large enough for many surgical procedures. b. many developmental control genes observed in the fly are also present in humans. c. flies are not subject to genetic mutations. d. while flies are small and easy to house, they require specialized and expensive dietary requirements. e. the control of fly development is unique and unrelated to human development.
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.