When molecules move through a cell membrane from an area of greater concentration to an area of lesser concentration by way of a channel protein, it is called:
A. endocytosis
B. exocytosis
C. facilitated diffusion
D. osmosis
E. simple diffusion
Answer: C
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A change in a single nucleotide that results in no change in the amino acid sequence of the polypeptide produced is known as a
A) nonsense mutation. B) silent mutation. C) missense mutation. D) frameshift mutation. E) none of the above
Organisms belonging to the genus Neisseria are:
a. gram-positive diplococci. b. gram-negative diplococci. c. gram-negative coccobacilli. d. gram-negative bacilli.
Which cell type produces an enzyme that lengthens telomeres?
a. cancer cells b. red blood cells c. cells in gonads that produce sperm and oocytes d. both cancer cells and red blood cells e. cancer cells, red blood cells, and cells in gonads that produce sperm and oocytes
Transformation is a process whereby:a
bacteria are transferred into plasmid cells. b. viruses are transferred into bacterial cells. c. plasmids are transferred into bacterial cells. d. bacteria are transferred into viral cells. e. plasmids are transferred into viral cells.