The accompanying figure best represents what happens at a(n) ____
a. neuromuscular junction
b. muscle fiber
c. postsynaptic terminal
d. neuronal membrane
e. negative feedback loop
ANSWER: a
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One reason food is refrigerated to control microbial growth is because irreversible cell damage is more likely to occur at low rather than high temperatures
Indicate whether the statement is true or false.
The significance of the Hershey and Chase
experiments in which 32P and 35S were used is that a. DNA labeled with 35S and proteins labeled with 32P can be traced in the course of an experiment. b. they demonstrated that DNA labeled with 32P is transferred from the bacteriophage to the virus. c. they established that proteins labeled with 35S become deactivated and unable to be transferred. d. they demonstrated that bacteriophages transfer their DNA, not their protein coats, into their hosts. e. DNA may be the hereditary material; although, bacteriophages transfer both DNA and proteins into their hosts
Who proposed the fluid mosaic model of cell membrane structure in 1972?
a. Davson and Singer b. Frye and Edidin c. Brown and Goldstein d. Singer and Nicholson e. Davson and Danielli
In Griffith's experiments, what happened when heat-killed S-strain bacteria were injected into a mouse along with live R-strain bacteria?
A) Proteins released from the heat-killed S-strain killed the mouse. B) DNA from the live R-strain was taken up by the heat-killed S-strain, converting them to R-strain and killing the mouse. C) DNA from the heat-killed S-strain was taken up by the live R-strain, converting them to S-strain and killing the mouse. D) RNA from the heat-killed S-strain was translated into proteins that killed the mouse.