Which movement is a passive process?
a. sodium-potassium pump
b. endocytosis
c. exocytosis
d. diffusion
e. transport proteins and ATP
d
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An initiator codon in E. coli is identified by locating:
A. a promoter sequence. B. the 5' cap structure. C. a Shine-Dalgarno sequence. D. a terminator sequence from the previous gene. E. an origin of replication.
According to the intermediate disturbance
hypothesis, a. species richness becomes greatest in between disturbances of moderate intensity or frequency. b. a disturbance is necessary during succession in order to stabilize the community. c. community succession is highly predictable. d. competition and other species interactions are the most important factors in shaping community structure. e. a community reverts to a climax state after a disturbance.
T cells are activated by macrophages and activated B cells, which fulfill this role by acting as ________
Fill in the blank(s) with correct word
The classification system includes the domain Archaea. What characteristic would NOT be found in an organism in this domain?
A) a cell membrane B) a set of genetic instructions C) a nucleus D) a cell wall