Which sentence best describes the role of the signal recognition particle (SRP)?
a. It activates gene expression.
b. It assists in polyadenylation of mRNA.
c. It assists in mRNA splicing.
d. It temporarily blocks translation.
Ans: d. It temporarily blocks translation.
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Macroscopically visible growths or clusters of microorganisms on solid media are called ________.
Fill in the blank(s) with the appropriate word(s).
David Pribnow studied the base sequences of promoters in bacteria and bacterial viruses. He found two conserved regions in these promoters (the -10 box and the -35 box). These two regions of the promoter _____
A) signal the initiation site B) bind the sigma subunit that is associated with RNA polymerase C) attach the correct nucleotide triphosphate to the template DNA strand D) separate the two DNA strands
For eukaryotes, transcription takes place in the
a. nucleus. b. nucleolus. c. cytoplasm. d. plasma membrane. e. nucleus and cytoplasm
In flowering plants, male gametophytes are also known as ________, which develop from microspores.
A. embryo sacs B. anthers C. megaspores D. pollen grains