The structures labeled "B" in the accompanying figure ____
a. prevent movement of materials between cells
b. are found in tissues subjected to stretching
c. allow the free passage of materials between cells
d. are found mostly in heart muscle
e. are found in most tissues except in the stomach
ANSWER: a
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What would be the hypothetical outcome if the action of RecA were inhibited during the SOS response?
A. LexA would autolyse, and therefore the transcription of DNA repair genes would occur. B. LexA would not autolyse, and therefore the transcription of repair genes would occur. C. LexA would not autolyse, and therefore the transcription of DNA repair genes would not occur. D. LexA would autolyse, and therefore the transcription of repair genes would not occur.
A tropical biome with grasses as primary producers and scattered trees adapted to prolonged dry spells is known as a:
a. warm desert b. savanna c. tundra d. taiga e. chaparral
Sperm-carrying fluid from the human male is
A. called semen. B. released on a twenty-eight-day cycle (approximately). C. stored in the urinary bladder. D. described by two of these answers.
The existence of nest-building in crocodiles and birds led to a prediction that this behavior was also present in
A) ancestral lizards. B) mammals. C) dinosaurs. D) invertebrates.