Movement of sodium across the cells of the collecting duct relies on which one of the following?
A) tubular secretion
B) glomerular filtration
C) tubular reabsorption
D) active transport
E) bulk flow
D
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Why is DNA ligase most active on the lagging strand during DNA replication?
a. The lagging strands contain more short DNA segments than the leading strand, which are joined together by DNA ligase. b. The lagging strand is synthesized more slowly, and DNA ligase speeds up the DNA polymerase. c. The lagging strand synthesizes DNA in the 3' ® 5' direction. d. The lagging strand requires DNA ligase to couple the RNA primer to the Okazaki fragments. e. DNA ligase performs the function of RNA primase on the lagging strand.
The "wagging dance" of the honeybee is believed to tell the other bees in the hive the
A. amount of water in the area. B. direction to a source of food. C. presence of enemy bees or other invaders. D. distance to another rival hive.
Trisomy 21 is a consequence of _________________, the unequal distribution of chromosomes during meiosis.
a. crossing over b. cytokinesis c. chorionic villus sampling d. recombination e. non disjunction
Colorblindness is more common in males than in females because the allele for colorblindness is
A) recessive and located on the X chromosome. B) recessive and located on the Y chromosome. C) recessive and located on the Y chromosome. D) dominant and located on the X chromosome.