Influenza A strains are characterized by
A) the type of animal in which the strain originated.
B) whether or not humans are infected.
C) the country in which the strain originated.
D) whether the virus contains DNA or RNA.
E) the type of HA and NA spikes found on the viral surface.
Answer: E
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Recent studies have shown that xeroderma pigmentosum (an error in the nucleotide excision repair process) can result from mutations in one of seven genes. What can you infer from this finding?
A) There are seven genes that produce the same protein. B) These seven genes are the most easily damaged by ultraviolet light. C) There are several proteins involved in the nucleotide excision repair process. D) These mutations have resulted from translocation of gene segments.
The second law of thermodynamics states that
a. energy can be transformed into matter, and because of this, something is obtained for nothing. b. energy can be destroyed during nuclear reactions such as those that occur inside the sun. c. if energy is gained by one region of the universe, another place in the universe also must gain energy in order to maintain the balance of nature. d. energy tends to flow from concentrated to less concentrated forms. e. none of these is true.
Protostomes exhibit radial cleavage
____________________ Indicate whether the statement is true or false.
Increased atmospheric CO2 concentrations might have what effect on seawater?
A) Seawater will become more alkaline, and carbonate concentrations will decrease. B) There will be no change in the pH of seawater, because carbonate will turn to bicarbonate. C) Seawater will become more acidic, and carbonate concentrations will decrease. D) Seawater will become more acidic, and carbonate concentrations will increase.