The bacterial species that can be described as able to grow in 6.5% sodium chloride (NaCl) and 40% bile, is part of the normal fecal flora of animals and humans, displays hemolysis, and is a major cause of nosocomial infections is:
a. E. faecalis.
b. S. pneumoniae.
c. S. pyogenes.
d. S. agalactiae.
A
All of the descriptions are true of E. faecalis.
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In fruit flies, natural selection tends to maintain both alleles of the foraging gene because:
a. gametes assort randomly b. larvae of each foraging type are more likely to survive when their type is rare c. larvae of each foraging type are more likely to survive when their type is common d. rovers often find more food than sitters e. sitters conserve more energy than rovers
DNA may be damaged from the by-products of normal cellular aerobic respiration. Name three of these electrophilic oxidants that are generally classified as reactive oxidants
What will be an ideal response?
Why must all living cells carefully regulate the fluidity of their membranes?
A. to permit membrane lipids and proteins to diffuse from their site of synthesis to other regions of the cell B. to allow cells to function at a broad range of temperatures C. to ensure that membrane molecules are distributed evenly between daughter cells when a cell divides D. to allow membranes, under appropriate conditions, to fuse with one another and mix their molecules E. to constrain and confine the movement of proteins within the membrane bilayer
How many nuclear divisions does meiosis utilize?
What will be an ideal response?