Cells in the juxtaglomerular apparatus secrete ____ in response to a significant drop in blood pressure or blood
volume.
a. atrial natriuretic factor
b. renin
c. aldosterone
d. antidiuretic hormone
e. angiotensin
ANSWER: b
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Which nitrogenous waste requires hardly any water for its excretion?
A) amino acids B) urea C) uric acid D) ammonia E) nitrogen gas
A polymer with the sequence 5' ACGTACGAATAG 3' is a:
A. polysaccharide. B. protein. C. piece of RNA. D. piece of DNA.
Nutrient absorption is mediated by the ________.
A. cell membrane B. nuclear membrane C. proteins in the periplasmic space D. peptidoglycan layer E. cell wall
In the process of isolating DNA for transcription and translation, you digest the DNA with BamHI and ligate the gene into a plasmid vector. However, even though all of the controls work, no transcription is obtained using your fragment. Working backward, you note that restriction digestion has removed approximately 250 base pairs from the 5' end of the gene. It is possible that during restriction
digestion A) the termination signal was removed. B) the RNA polymerase became inactivated. C) primase could not bind. D) the promoter was removed E) none of the above