________ may destroy infected body cells
A) Phagocytic cells
B) Helper T cells
C) Natural killer cells
D) Cytotoxic T cells
D
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Bacteriochlorophyll differs from chlorophyll a and b in structure and function. Which of the following statements correctly contrasts these types of chlorophyll?
A) Bacteriochlorophyll has a porphyrin ring, whereas chlorophyll does not. B) Chlorophyll has a phytol side chain, but bacteriochlorophyll does not. C) Chlorophyll has a methyl group attached to the porphyrin ring, whereas bacteriochlorophyll has a formyl group. D) Bacteriochlorophyll has a saturated carbon-carbon bond at one location in the porphyrin ring, whereas chlorophyll does not. E) both choices A and D correctly contrast these types of chlorophyll.
__________ is one form of learning that happens only during a sensitive period early in life. Fill in the blank(s) with the appropriate word(s)
Plant cells build a cuticle
a. beneath the plasma membrane. b. between the plasma membrane and the primary cell wall. c. between the primary cell wall and the secondary cell wall. d. as a component of the secondary cell wall. e. at plant surfaces exposed to air.
Which of the following is TRUE about cloning?
a) cloning specifically refers to creation of new individuals with the exact genome as a donor individual b) Hans Spemann successfully cloned the first animal in 1938 c) the only successfully cloned animals have been sheep d) cloning refers to a variety of techniques, ranging from whole organism cloning to tissue and organ cloning e) scientists have successfully cloned a dinosaur from DNA fragments found in preserved fossils