It is evident that translation occurs at ribosomes because they contain binding sites for
A) primary transcripts of mRNA.
B) DNA repair enzymes.
C) rRNA.
D) tRNA and mRNA.
E) mitotic spindles.
D
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The major source of diversity for B and T cell receptors is
a. mitosis. b. meiosis. c. transcript processing. d. random recombination of gene segments. e. mutation.
Human ventilation is
a. negative pressure inhalation. b. positive pressure inhalation. c. negative pressure exhalation. d. both b and c.
Based on the graph, the threshold voltage appears to be approximately
A) +60 mV. B) +30 mV. C) 0 mV. D) ?30 mV. E) ?60 mV.
How does an intrauterine device (IUD) prevent pregnancy?
A. killing sperm as they enter the fallopian tubes. B. preventing sperm from entering the vagina. C. creating a uterine environment toxic to sperm and eggs. D. disabling the cilia that facilitate the passage of the eggs.