Animal life underwent its greatest diversification during the ________, which began about ________ million years ago
A) Paleozoic era... 290
B) Paleozoic era... 540
C) Mesozoic era... 363
D) Mesozoic era... 245
B
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Laboratory diagnosis of HIV infection is usually made by which of the following?
A) electron microscopy B) growth of HIV in cell culture C) growth of HIV in embryonated chicken eggs D) immunodiagnostic procedures for the detection of antigen and antibodies
Which of the following statements is not true of the TCA cycle?
A) Oxidation occurs at three steps in the TCA cycle. B) Decarboxylation occurs at two steps in the TCA cycle. C) ATP/GTP is generated at one point by substrate-level phosphorylation. D) Acetate enters the TCA cycle and joins a four-carbon acceptor molecule to form citrate. E) FAD is an electron acceptor in the cycle.
The atomic number for an atom of a specific element is equal to (Check all that apply)
__X__ the number of electrons in a single atom of that element. _____ the number of electrons plus neutrons in a single atom of that element. __X__ the number of protons in a single atom of that element. _____ the number of neutrons and protons in a single atom of that element.
Residual air volume is indicated by the letter ____
a. A b. B c. C d. D e. E