Molluscs having two jointed valves or shells belong to the class:

a. Gastropoda.
b. Cephalopoda.
c. Bivalvia.
d. Polyplacophora.
e. Scaphopoda.


C

Biology & Microbiology

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Explain how proteins that are produced in a cell correctly end up in the cytosol, the endomembrane

system, and the mitochondria.

What will be an ideal response?

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The drug mifepristone (RU-486) is a contraceptive that

a. blocks passage of sperm through the male reproductive tract. b. blocks passage of sperm through the female reproductive tract. c. prevents ovulation. d. causes shedding of the endometrial lining and the implanted embryo by initiating a menstrual period. e. prevents implantation by blocking estrogen receptors in the uterus.

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Which molecule ultimately gets translated into a protein?

a. DNA b. rRNA c. mRNA d. tRNA e. RNA polymerase

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