Which of the following is a virus with an icosahedral head, a capsid that contains primarily three proteins, a connecting neck with a collar and long whiskers, a long tail and a complex base plate?
A. influenza virus
B. measles virus
C. T4 bacteriophage
D. HIV
E. tuberculosis
C. T4 bacteriophage
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Which of the following is/are required with actin and myosin in order to initiate muscle contraction?
A. ATP B. calcium and phosphate C. phosphate D. calcium and ATP E. calcium
Natural selection acts on ________, and ________ evolve.
A. individuals; populations B. populations; individuals C. individuals; individuals D. populations; populations
When the nerve signal reaches the axon terminal, what happens next?
A. The muscle contracts. B. The synaptic vesicles release neurotransmitter. C. An electrical signal is formed that jumps the synaptic cleft. D. Myosin is released from the axon terminal. E. H+ is pumped into the synaptic cleft.
This photograph illustrates micropropagation, a form of artificial reproduction in plants. Which of these is unlikely to be an application for micropropagation?
a. preserving plants vulnerable to extinction
b. growing plants for experiments in labs
c. mass-producing grain for famine relief
d. breeding plants with pharmacological value