Encapsulation of a hypercycle would not be favored when:
a. the costs of a membrane exceed the benefits of the cycle.
b. the membrane provides a defensive mechanism.
c. natural selection favor mutations in component members.
d. RNA components act through molecular mutualism.
A
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During exposure to elevated glucose, a yeast cell's membrane glucose transporters will rapidly increase so the cell can import glucose. Which would represent the signal for the yeast cell?
A. glucose transporters B. glucose receptors C. glucose D. glucose transport into the cell E. glucose kinase
The most likely identification of a bile-sensitive, kanamycin-resistant, catalase-negative, and indole-negative anaerobic gram-negative bacilli is:
a. nonpigmented Prevotella. b. Porphyromonas spp. c. Bacteroides fragilis group. d. pigmented Prevotella.
Conservation biologists are often concerned that when the population size of an endangered species becomes too small, it is at risk of extinction for which reason?
A. They are at risk of sympatric isolation. B. They can no longer evolve. C. They may be more susceptible to changes in the environment or disease. D. They are at risk of developing prezygotic barriers to reproduction. E. Their rate of breeding will decline.
The enzyme glucose-6-phosphate dehydrogenase deficiency (G6PD) is inherited as a recessive gene on the X chromosome in humans. A phenotypically normal woman (whose father had G6PD) is married to a normal man
(a) What fraction of their sons would be expected to have G6PD? (b) If the husband had G6PD, would it make a difference in your answer in part (a)?