The direct role of LH in males is to
a. stimulate testosterone secretion.
b. stimulate spermatogenesis.
c. stimulate Sertoli cells.
d. inhibit GnRH secretion.
e. do all of these.
Answer: a
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The most significant conclusion of the experiments on Heliconius butterfly mimics is that ________
A) evolution can sometimes happen by sudden jumps B) genes can occasionally be transferred between completely unrelated organisms C) natural selection is the only mechanism for evolutionary diversification D) the same developmental genetic mechanisms underlie a great range of variants E) development must be studied separately from evolutionary genetics
The amplification of recombinant plasmids occurs by:
a. the growth of the plasmid DNA. b. DNA replication of plasmids outside a host cell. c. the process of growth and division of the host cell. d. transformation of bacterial cells. e. the polymerase chain reaction.
This immunoglobulin gives long-term immunity and is associated with memory response.
A) IgG B) IgA C) IgM D) IgD
Which of the following bacterial genera produce(s) endospores?
A. Bacillus B. Clostridium C. Lactobacillus D. both Bacillus and Lactobacillus E. both Bacillus and Clostridium