Exposure of purified phospholipids to water results in the spontaneous formation of:
A. lipid bilayers.
B. triacylglycerols.
C. steroids.
D. polypeptides.
E. carbohydrates.
Answer Key: A
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In an isometric contraction of a skeletal muscle,
(a) the tension in the muscle increases. (b) movement occurs. (c) no movement occurs. (d) both a and c occur.
How is lac operon transcription regulated by the presence or absence of lactose?
a. When lactose is not available, the repressor will bind to the promoter and block RNA polymerase from transcribing the genes of the lac operon. b. When lactose is available, the repressor will bind to the lactose instead of blocking RNA polymerase. c. When lactose is not available, the repressor will bind to allolactose. d. When lactose if available, allolactose is produced and binds to the operator, blocking RNA polymerase. e. In the absence of lactose, transcription occurs at a low level resulting in the production of allolactose which in turn stimulates the cell to take up lactose.
In the viral disease, _____, motor neurons are destroyed
Fill in the blank(s) with the appropriate word(s).
The first vertebrates to be able to reproduce on land were the
A. amphibians. B. insects. C. reptiles. D. mammals.