Cytotoxic T cells produce ____
a. cytokines
b. antibodies
c. plasma cells
d. perforins
e. histamine
ANSWER: dANSWER: d
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In a mammal's bloodstream, where would you expect to find oxygen? Select all correct
A. dissolved in blood plasma B. attached to the heme group of myoglobin in red blood cells C. attached to the heme groups of hemoglobin in red blood cells D. attached to the heme group of myosin in red blood cells E. dissolved in hemolymph
What was the significance of the Hershey-Chase experiments in which 32P and 35S were used?
a. They finally demonstrated the semiconservative nature of DNA replication. b. They demonstrated that harmless bacterial cells had become permanently transformed through a change in the bacterial hereditary system. c. They established that pure DNA extracted from disease-causing bacteria transformed harmless strains into killer strains. d. They demonstrated that radioactively labeled bacteriophages transfer their DNA but not their protein coats to their host bacteria. e. They demonstrated that DNA content of a cell does not vary over time.
With respect to genetic traits, what is the opposite of recessive?
a. regressive b. progressive c. dominant d. subordinant e. hybrid
Pattern baldness is a trait that is referred to as sexa
linked. b. related. c. retarded. d. influenced. e. matched.