If the world were to support the largest possible human population, all humans would need to be
A. carnivores.
B. omnivores.
C. herbivores.
D. producers.
C. herbivores.
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In humans, male-pattern baldness may be assumed to be controlled by an autosomal gene that occurs in two allelic forms. Allele B determines nonbaldness, and allele b determines pattern baldness. In males, because of the presence of testosterone, allele b
is dominant over B. If a man and woman both with genotype Bb have a son, what is the chance that he will eventually be bald? A) 0% B) 25% C) 33% D) 50% E) 75%
Which of the following is an exception to the central dogma?
A) the discovery of RNA viruses that synthesize DNA using reverse transcriptase B) the discovery that the Archaea and Bacteria are more distantly related than are Archaea and Eukarya C) the discovery of ribozymes D) the discovery of DNA as the unit of genetic inheritance
Which of the following is an example of a positive feedback mechanism?
a. increase in body temperature when exposed to cold b. increased muscle contractions during labor c. decreased insulin production in response to low blood sugar d. increased respiration rate in response to decreased blood pH e. Both choices A and B are correct.
The hematocrit is a measuure of the percentage of whole blood occupied by
a) WBC b) platelets c) RBCs d) plasma e) plasma proteins