Hyperventilation would lead to a(n) ________ within the systemic arteries.
A) increase in PO2 and decrease in PCO2
B) selective decrease in PO2
C) selective decrease in PCO2
D) selective increase in PO2
E) decrease in PO2 and increase in PCO2
Ans: A) increase in PO2 and decrease in PCO2
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Malassezia spp. are the MOST common fungi present on the skin of humans
Indicate whether the statement is true or false.
Lederberg and Tatum used the bacterial strains bio- met- leu+ thr+ thi+ and bio+ met+ leu- thr- thi- in their
experiments to determine if genetic recombination occurs in bacteria. Would it have been better to use two strains with the genotypes met- leu+ and met+ leu- instead?
a. Yes, because it is easier to study 2 genes than 5 genes. b. Yes, because the met- leu+ and met+ leu- strains only have one mutation, which makes it easier for genetic recombination to occur. c. No, because the met- leu+ and met+ leu- strains only have one mutation. A single random mutation could restore methionine or leucine synthesis in the strains. d. No, because strains with only one nutrient-deficient gene can still grow on minimal medium. e. No, because cells have two genes that encode different versions of leucine, so the met+ leu- strain would still be able to grow on minimal medium.
Which of the following statements is FALSE?
a. Ecologists use models to represent relationships between biogeochemical cycles and most ecosystems. b. The physical environment has virtually no reservoir for most elements. c. Inputs from the physical environment and recycling made possible by decomposers and detritivores maintain the nutrient reserves in an ecosystem. d. In most major ecosystems, the amount of nutrients that is cycled within the ecosystem is greater than the amount entering or leaving the ecosystem in a given year. e. Once elements are in the biological compartments of the biogeochemical cycles, they are unlikely to leave until the organism dies.
When a community like the tallgrass prairie is maintained by recurring disturbances such as periodic fires set by Native Americans or by lightning, a ________ community exists
A) pine forest B) pioneer C) climax D) deciduous E) subclimax