Which type(s) of mutation might lead to a threonine auxotrophic revertant?
A. Point mutation
B. Missense mutation
C. Base substitution
D. All of the choices are correct.
Answer: D
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The types of living organisms on Earth have changed over time, new species have originated, and species have disappeared. These are examples of
A. macroevolution. B. extinction. C. speciation. D. hybridization. E. alternation of generations.
Which of the following is TRUE concerning
seeds?
a. Present-day ferns produce seeds. b. Seeds contain an immature sporophyte. c. Pollen grains mature into seeds. d. Seeds contain a food source. e. All of these are true
What chemical group is found in a nucleotide but not in a nucleoside?
A.)sugar B.) nitrogen containing base C.) pentose D.) hydroxyl group E.) phosphate
All of the following are reasons to classify a new strain of bacteria except
A) 50% different genetic material. B) take up genetic material from their environment. C) genetic variant. D) mutations. E) gene transfers.