In what phase of the cell cycle does an actively dividing cell produce the proteins necessary for mitosis?
a. G1
b. S
c. G2
d. prophase
e. G1 and G2
ANSWER: c
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There are bacteria that live on single-celled eukaryotes
A. true B. false
Which of the following best describes the tRNA binding sites of the ribosome?
A. Only one of the three sites can be occupied by a tRNA molecule at any given time. B. Each tRNA that associates with the ribosome must first bind in the P site and then move to the A site. C. The P site contains the tRNA molecule covalently bound to the growing chain of amino acids. D. All tRNAs leave the ribosome through the A site.
The rabies virus is transmitted to humans by
A. contamination of scratches with saliva from an infected animal. B. the bite of an infected animal. C. aerosols of the virus that can be present in caves where bats roost. D. All of the choices are correct.
New polypeptide chains for proteins are assembled on
a. Golgi bodies. b. lysosomes. c. ribosomes. d. peroxisomes. e. centrosomes