Which sigma factor, encoded by the rpoH gene, is active at high temperatures?
A) ?70
B) ?32
C) ?45
D) ?37
E) ?50
B
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As populations approach carrying capacity, crowding can affect:
A. birth rates through resource limitation. B. death rates through resource limitation. C. death rates by increasing the transmission of pathogens and parasites. D. birth and death rates through resource limitation. E. birth and death rates through resource limitation, and death rates by increasing the transmission of pathogens and parasites.
In estuaries,
a. temperature and salinity remain relatively constant throughout the day. b. temperature and salinity vary sharply during the day. c. temperature varies greatly but salinity remains constant. d. salinity varies greatly but temperature remains constant. e. organisms are not well adapted to wide swings in salinity.
Excess energy is stored in ____ mainly in ____
a. chemical bonds; adipose tissue b. chemical bonds; carbohydrates c. carbon atoms; adipose tissue d. carbon atoms; carbohydrates e. hydrogen bonds; water
The cytoskeleton ____
a. extends between the nucleus and the plasma membrane b. is found within the nucleus c. is associated with only certain cell structures d. is found within organelles e. is found in all animal cells but not in cells with cell walls