Hormones are signaling molecules that are carried in the ____
a. cerebral spinal fluid
b. intracellular fluid
c. extracellular fluid
d. bloodstream
e. synapses
ANSWER: d
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A proto-oncogene ____
a. always becomes cancerous b. causes cancer c. encodes tumor-suppressing proteins d. repairs DNA e. regulates cell division
All of the following statements are true about restriction enzymes EXCEPT
A. hundreds of different ones have been isolated and purified. B. they are made by bacteria and viruses. C. each enzyme cuts DNA at a different specific base sequence. D. they produce single-stranded complementary ends that can join to two different DNA strands by complementary base-pairing.
In yeast in the presence of galactose, you unexpectedly find that transcription is still blocked. Assuming Gal80 is present and functional, which other protein may be mutated to prevent transcriptional activation?
A) Gal2 B) Gal3 C) Gal4 D) Mig1 E) Gal10
A blocked coronary sinus would block blood flow:a
into the superior vena cava. b. into the inferior vena cava. c. into the pulmonary arteries. d. returning from the pulmonary arteries. e. returning from the coronary circulation