High temperatures can cause proteins in a cell to denature. This can be reversed by heat shock proteins that function as ________.
A. ribosomes
B. chaperones
C. proteasomes
D. polymerases
E. catalysts
Answer: B
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The three primary germ layers are formed during
a. fertilization. b. cleavage. c. organ formation. d. gastrulation.
Roots obtain cations through cation exchange. Which of the following do roots use to exchange for other cations from the soil?
a. Cl? b. K+ c. H+ d. H2O
Some archaea have unique phospholipids in their cytoplasmic membrane that
A) form a monolayer due to the presence of diglycerol tetraethers. B) form a bilayer due to the presence of sterols. C) form a stable ring structure due to the presence of crenarchaeol. D) form a bilayer due to the presence of phosphatidylethanolamine.
The Krebs cycle is believed to have developed fairly recently in the evolution of cellular life
A. true B. false