In which part of the ribosome is the growing polypeptide chain positioned during translation?
a. in the P site
b. in the small subunit
c. in the A site
d. in the E site
Ans: a. in the P site
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Carl Woese named the ancient aggregate of DNA, RNA, proteins, and lipids a
A. progenote. B. molecule. C. liposome. D. domain. E. cell.
Which of the following statements is false?
a. In chain elongation, the amino acids are added to the chain according to the codon sequence in the messenger RNA. b. Several ribosomes, called a polysome, can travel along the messenger RNA molecule, translating it at the same time. c. The general shape of transfer RNA molecules is uniform. d. Enzymes found in the ribosome catalyze the formation of the bonds in the new polypeptide. e. None of these is false.
Which of the following normally occurs regardless of whether or not oxygen (O2 ) is present?
A) glycolysis B) fermentation C) citric acid cycle D) oxidative phosphorylation (chemiosmosis)
Which biome receives the lowest annual rainfall?
A) Tropical deciduous forest B) Tropical rain forest C) Chaparral D) Desert E) Savanna