________ may destroy infected body cells

A) Phagocytic cells
B) Helper T cells
C) Natural killer cells
D) Cytotoxic T cells


D

Biology & Microbiology

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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.

Biology & Microbiology

__________ 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)

Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology