Which of the following are sugar-transporting cells in angiosperms?
a) parenchyma cells
b) tracheids and vessel elements
c) sieve-tube elements
d) collenchyma cells
e) clerenchyma cells
Ans: c) sieve-tube elements
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What might be a reason for the accumulation of improperly folded protein complexes in the bacterial cell cytoplasm following translation?
A. The cell is synthesizing proteins too rapidly. B. Polysomes are forming on the mRNA. C. A problem exists with the functioning of molecular chaperones. D. The proteins are being transcribed but not translated.
In atherosclerosis,
a. the lumen of the artery is narrowed b. the arterial walls fill with fibrous connective tissue. c. lipids in the bloodstream become embedded in the walls of the endothelial lining. d. a fibrous net covers the entire abnormal area. e. all of these occur.
The bacterial genome is located in a portion of the cell called the
a. nucleus. b. nucleoid. c. mesosome. d. nucleophyll.
The 50S ribosomal subunits are found in:
A. The Prokaryotes B. The Eukaryotes C. Both, the Eukaryotes and the Prokaryotes D. Neither the eukaryotes nor the prokaryotes