The genome of viruses consists of:
A. double-stranded DNA.
B. single-stranded DNA.
C. double-stranded RNA.
D. single-stranded RNA.
E. Viruses genomes can contain any of the
nucleic acids listed.
E
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During the contraction of a vertebrate skeletal muscle fiber, calcium ions _____
A) break cross-bridges by acting as a cofactor in the hydrolysis of ATP B) bind with troponin, changing its shape so that the myosin-binding sites on actin are exposed C) transmit action potentials from the motor neuron to the muscle fiber D) spread action potentials through the T tubules E) re-establish the polarization of the plasma membrane following an action potential
Typical conditions used for sterilization are
A. 100?C for 10 minutes. B. 121?C at 15 psi for 15 minutes. C. 80?C for 15 minutes. D. 72?C for 15 seconds.
Which type of nutrient can pass across epithelial cells without any expenditure of ATP?
A. protein B. calcium C. iron D. magnesium E. fat
The disinfectant screening method that is known as the ________ ________ test, is used to measure the potency of a disinfectant.
Fill in the blank(s) with the appropriate word(s).