In the experiments conducted by Avery, McCarty, and MacLeod, which one of the following hypothetical results would indicate that protein, not nucleic acid, was Griffith's transforming principle?
A. None of the extracts from heat-killed cells are able to transform nonvirulent bacteria.
B. All of the extracts from heat-killed cells are able to transform nonvirulent bacteria.
C. Only the extract from heat-killed cells treated with RNase are unable to transform nonvirulent bacteria.
D. Only the extracts from heat-killed cells treated with DNAse are unable to transform nonvirulent bacteria.
E. Only the extracts from heat-killed cells treated with protease are unable to transform nonvirulent bacteria.
Answer E
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Which of the following is not a level of organization in the vertebrate body?
A. cells B. bones C. tissues D. organs E. organ systems
Transformation was discovered by:
a. Francois Jacob. b. Elie L. Wollman. c. Gregor Mendel. d. Joshua Lederberg. e. Fred Griffith.
Which extraembryonic tissue burrows into, and thus attaches to, maternal tissues?
a. the amnion b. the yolk sac c. the chorion d. the blastocyst protein coat e. the inner cell mass
Which of these statements is false regarding
stramenopiles? a. They have unique flagella with tinsel-like filaments. b. Some species are unicellular. c. They include diatoms and red algae. d. Most are photosynthetic. e. Their chloroplast structure hints at endosymbiotic origins.