Which of the following eukaryotic RNA polymerases is responsible for transcribing ribosomal RNAs (rRNAs)?
A. RNA Pol I
B. RNA Pol II
C. RNA Pol III
D. RNA Pol I and RNA Pol III
E. RNA Pol II and RNA Pol III
D
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Which small-scale mutation would be most likely to have a catastrophic effect on the functioning of a protein?
A) a base substitution B) a base deletion near the start of a gene C) a base deletion near the end of the coding sequence, but not in the terminator codon D) deletion of three bases near the start of the coding sequence, but not in the initiator codon E) a base insertion near the end of the coding sequence, but not in the terminator codon
Which statement is true about chlamydia?
a. It often harms the joints and skin. b. It damages the liver, bones and brain. c. It has no cure.
d. It causes a compromised immune system. e. It can be passed from mother to child during birth.
Which one of the following is found directly beneath the cells of an epithelial tissue?
A) fibrous connective tissue B) basement membrane C) collagen and elastic fibers D) bi or multipolar extensions E) muscle tissue
Which virus infects virtually all children by age 2?
a) coronavirus b) respiratory syncytial virus c) rhinovirus d) Influenza virus