Lymphocyte maturation involves
A) B-cells maturing in bone marrow sites.
B) All of these choices are correct.
C) T-cells maturing in the thymus.
D) Release of mature lymphocytes to begin migration to various lymphoid organs.
E) Hormonal signals that initiate development.
B) All of these choices are correct.
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Each of the major hypotheses proposed to explain why sexual reproduction is more widespread than asexual reproduction ultimately base their explanations on the adaptive benefit of (select all correct choices):
A. forming pair bonds. B. forming genetically distinct offspring. C. forming large populations. D. forming relatively slow-growing populations. E. reducing mutation rates.
How did Meselson and Stahl distinguish between semiconservative and dispersive replication in their experiment?
A. After one round of replication, only mixed DNA molecules were present in native gradients. B. After two rounds of replication, only mixed DNA molecules were present in the gradient. C. After two rounds of replication, both heavy and light DNA molecules were present in the gradient. D. After one round of replication, both heavy and light DNA single-strands were present in alkaline gradients. E. After two rounds of replication, only heavy DNA strands were present in alkaline gradients.
Leaf abscission is initiated and orchestrated by the hormone abscisic acid
____________________ Indicate whether the statement is true or false.
Cultural eutrophication can be caused by
A. mercury from industrial sources. B. detergents, fertilizers, and sewage treatment plants. C. biological magnification. D. respiration and transpiration. E. bacteria and viruses from sewage and barnyard waste.