A region of the nephron that regulates the blood pressure in the afferent arteriole, which stimulates the release of aldosterone, is the ________
A) juxtaglomerular apparatus B) glomerulus
C) glomerular capsule D) loop of the nephron
Answer: A
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The chemical bond connecting one nucleotide with the next along one strand of a DNA molecule is called a
A. glycosidic bond. B. hydrogen bond. C. phosphate bond. D. phosphodiester bond. E. peptide bond.
The template for RNA polymerase is ________, and the new RNA chain is ________ to the template
A) an independent RNA segment / parallel and identical B) DNA / antiparallel and complementary C) an independent RNA segment / antiparallel and complementary D) DNA / parallel and identical
The graph below shows a growth curve of E. coli growing in a defined medium containing equal molar amounts of glucose and lactose.
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Based on your knowledge of the regulation of the lac operon, the best explanation of these results is that
A) early on, due to the presence of lactose, the bacteria utilize the lac operon. Glucose is used later.
B) the bacteria are utilizing both sugars simultaneously.
C) the presence of glucose causes the formation of cAMP catabolic repressor protein (CRP) complexes, which shut down the lac operon until the glucose is used up.
D) glucose is used first. Once glucose becomes limiting, intracellular cAMP increases, forming cAMP-CRP complexes that activate the lac operon to use lactose.
E) none of the above
FISH analysis is useful for determining the
A) order of DNA fragments in a BAC. B) pattern of expression of a cloned gene. C) chromosomal location of a gene. D) map order of two closely linked genes.