Carl Woese and George Fox proposed the (phylum/domain/family), a taxon that contains multiple kingdoms
What will be an ideal response?
domain
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Which of the following statements about DNA is (are) true?
A) DNA contains thymine but not uracil. B) DNA molecules contain deoxyribose. C) In a double-stranded DNA molecule, adenine on one strand will be connected to thymine on the complementary strand by two hydrogen bonds. D) All of the above statements are true.
Full induction of the lactose operon requires
A. lactose present. B. lactose and glucose present. C. lactose and arabinose present. D. lactose present without glucose.
Which of the following statements best expresses the concept of punctuated equilibrium
A. Small variations gradually accumulate in evolving lineages over periods of millions of years B. Random mating ensures that the proportions of genotypes in a population remain unchanged from generation to generation C. Stability is achieved when selection favors the heterozygote, while both types of homozygotes are at a relative disadvantage D. Evolutionary changes consist of rapid bursts of speciation alternating with long periods which species remain essentially unmodified E. Under competition for identical resources, one of the two competing species will be eliminated or excluded
One ml of a liquid suspension of bacteriophage is mixed with its host bacteria and plated. After incubation, the plate is completely clear. What is the probable explanation?
A) The phage concentration was too low to infect many bacterial cells. B) The phage concentration was so high that all the host bacterial cells were killed. C) The bacteria mutated and could no longer be infected by this phage. D) The bacteriophage culture was dead. E) The bacteriophage doesn't grow on the type of agar used.