In science, a theory is defined as ____
a. a speculative guess
b. a hypothesis
c. an explanation that is well documented and consistent with the evidence
d. a description of a phenomenon for which there is no explanation
e. a personal conviction
ANSWER: c
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Phytochromes are pigment proteins that allow plants to detect light
a. True b. False
Which of the following carries amino acids to ribosomes, where amino acids are linked into the
primary structure of a polypeptide? a. mRNA b. tRNA c. hnRNA d. rRNA e. rDNA
Which of the following statements about protein kinase A (PKA) is false?
a. In the inactive state, PKA exists as a tetramer of two regulatory (R) and two catalytic (C) subunits. b. PKA binds a total of four molecules of cAMP, one on each of the four subunits. c. PKA binds a total of four molecules, two molecules on each of the two regulatory (R) subunits. d. Once activated, the catalytic (C) subunits dissociate and activate target molecules.
Which of the following is the proper sequence for mitosis? I. Metaphase II. Telophase III. Prophase IV. Anaphase
A. I, III, IV, II B. I, II, III, IV C. III, I, IV, II D. IV, I, III, II E. III, IV, I, II