The effect of inbreeding is:
A. an increase of homozygotes in succeeding generations.
B. a decrease of heterozygotes in succeeding generations.
C. decreasing the mean fitness of a population.
D. All of the choices are correct.
D. All of the choices are correct.
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PSII and PSI differ in __________
A. H+ production B. H+ production and electron donors C. H+ production, electron donors, and acceptors D. electron donors and acceptors E. plants and algae
Hantavirus is transmitted by which of the following ways?
A. Via the oral-fecal route when deer mouse feces contaminate drinking water B. Directly from the saliva of a deer mouse after being bitten C. From a mosquito that first bites a deer mouse, and then bites a human D. Aerosolized particles of deer mouse feces, urine, or saliva E. Aerosolized droplets from human to human
The fact that Salmonella has a high ID50 means that
A. it is more pathogenic than 50% of all gut microbes. B. an antibiotic dose of 50 ?g/ml can be expected to kill the organism. C. the most stringent decontamination measures must be used in food preparation facilities. D. consuming just a few cells of Salmonella will not result in illness.
Tree rings occur when _____
a. there are droughts during the time the rings form b. environmental conditions influence xylem cell size c. heartwood alternates with sapwood