Which of the statements below is supported by the Avery, McCarty, and MacLeod experiment and the data in the figure above?
A. Lipids from one strain of bacteria can alter the phenotype of another strain if those lipids are taken up by the other strain.
B. DNA from one strain of bacteria can alter the phenotype of another strain if that DNA is taken up by the other strain.
C. RNA from one strain of bacteria can alter the phenotype of another strain if that RNA is taken up by the other strain.
D. Protein from one strain of bacteria can alter the phenotype of another strain if that protein is taken up by the other strain.
E. Carbohydrates from one strain of bacteria can alter the phenotype of another strain if those carbohydrates are taken up by the other strain.
Ans: B. DNA from one strain of bacteria can alter the phenotype of another strain if that DNA is taken up by the other strain.
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Taxonomy can be described as a system that:
a. classifies, names, and identifies microor-ganisms in a consistent manner. b. classifies microorganisms, based on their genetic makeup. c. classifies microorganisms, based on their phenotypic makeup. d. classifies microorganisms, based on their cellular and colonial traits.
Once a macrophage ingests a foreign antigen, how is the antigen presented?
a. The antigen is embedded directly into the cell membrane of the macrophage. b. The antigen is embedded in the membrane of a transport vesicle and released via exocytosis. c. The antigen is attached to a receptor protein, forming a receptor-antigen complex. d. The antigen is attached to MHC markers, forming a MHC-antigen complex e. The antigen becomes part of the T cell membrane.
Regarding the Gram stain technique, which of the following is the primary stain?
a. Crystal violet b. Safranin c. Iodine d. Carbolfuchsin
If a prokaryotic cell experienced a mutation that eliminated DNA polymerase's 3' to 5' exonuclease activity, what part of DNA synthesis would be affected?
a. The single-stranded DNA would not remain open.
b. Proofreading would not occur.
c. The lagging strand fragments could not be connected together.
d. The replication fork would be unable to move.