Which of the following processes does NOT serve to
maintain low pressure at the receiving end of sieve
tube pipelines?
a. sucrose conversion into cell-wall
polysaccharides
b. sucrose conversion into starch in the receiving
regions
c. sucrose conversion to glucose, which is then
used in cellular respiration
d. activity of companion cells
e. conversion of sucrose to fructose in fruits
Answer: d
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When a stalled replication fork undergoes fork regression the next step:
A. can be repair of the lesion because it has become double-stranded again. B. can be degradation of the displaced strands followed by branch migration and continued replication. C. can be translesion synthesis to bypass the lesion. D. can be synthesis-dependent strand annealing (SDSA). E. All of the choices given are possible outcomes.
In yeast chromosomes, centromeres
A) help distinguish one chromosome from another. B) are closely related in sequence. C) are only 10–15 bp long. D) contain satellite DNA.
The phenotype of ____ does not develop until adulthood
a. muscular dystrophy b. Marfan syndrome c. cystic fibrosis
d. hemophilia e. Huntington’s disease
Which pair includes animals that are both classified as suspension feeders?
a. lampreys and rabbits b. whales and clams c. clams and aphids d. aphids and whales