In RNAi, imperfect pairing of miRNA to target mRNA results in ____ while perfect pairing of miRNA to target
mRNA causes ____.
a. blocking transcription of the target mRNA; mRNA degradation
b. blocking translation of the target mRNA; mRNA degradation
c. recruitment of siRNA; blocking translation of the target mRNA
d. mRNA degradation; recruitment of siRNA
e. blocking transcription of the target mRNA; blocking translation of the target mRNA
ANSWER: b
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The tertiary structure of proteins is the three dimensional shape comprised of two or more polypeptides
Indicate whether the statement is true or false.
Invertebrates, such as the flatworm, have groups of neurons with a common function. These nerve
clusters are called
a. nerve cords. b. ganglia. c. brains. d. nerve nets. e. radially symmetrical.
A pigment absorbs a photon if the energy of the photon is ____.
A. exactly enough to boost an electron of the pigment to a higher energy level B. slightly more than the energy of the electron absorbing the photon C. significantly more than the energy of the electron absorbing the photon D. exactly twice the energy of the electron absorbing the photon E. significantly less than the energy of the electron absorbing the photon
In which cells would you expect to find the highest level of telomerase?
A. adipose tissue cells B. muscle cells C. cells that replenish the lining of the gut D. neurons