Two populations that have no gene flow between them are likely to
a. become more different with time.
b. become more alike with time.
c. become more alike if the directional selection pressures are different.
d. stay the same unless mutations occur.
c
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Horizontal gene transfer is less prevalent in eukaryotic species because
A. of the presence of organelles in the cells of eukaryotic species. B. of the multicellularity in eukaryotic species, which is lacking in prokaryotic species. C. eukaryotic species reproduce by sexual reproduction. D. of multicellularity and sexual reproduction. E. of the presence of organelles and multicellularity.
Answer the following statements true (T) or false (F)
1. The disease schistosomiasis is caused by a parasitic trematode. 2. Tagmata are segments of the body that represent two or more previous body segments fused together. 3. Scorpions do not lay eggs but rather give birth to live young. 4. Millipedes have a thousand legs whereas centipedes have only a hundred legs.
Which is a correct description of hormone action?
A. FSH stimulates Leydig cells in the testes. B. LH stimulates Sertoli cells in the testes. C. Testosterone stimulates corpus luteum. D. GnRH stimulates the anterior pituitary gland. E. Testosterone regulates LH and FSH in a positive feedback loop.
Preservatives such as citric acid are added to foods to interfere with bacterial growth. This creates an acidic pH in the food. Why does this affect the bacteria that are present?
A) An acidic environment causes bacterial enzymes to fail or work less efficiently. B) An acidic environment increases the activation energy more quickly in bacteria. C) An acidic environment encourages endergonic reactions in the bacterial cells. D) An acidic environment causes the bacteria to grow more rapidly.