A researcher has a petri dish containing several species of bacteria, but no viruses. She notices that the population of E. coli in her petri dish has no antibiotic resistance
Two weeks
later, she reassesses the bacteria and finds that the E. coli have acquired antibiotic
resistance. How could this have happened?
A. E. coli acquired the genes conveying
antibiotic by conjugation with other bacterial
cells.
B. E. coli acquired the genes conveying
antibiotic by transformation.
C. Spontaneous mutations conveying
antibiotic-resistance arose in the E. coli
population of the petri dish.
D. All of these answer options are correct.
D
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Which of the following is not true of the interaction of TBP with DNA?
A. TBP is able to interact with DNA nonspecifically with respect to sequence. B. TBP binds the TATA box through minor groove DNA contacts. C. A helix-turn-helix motif in TBP makes the DNA contacts. D. The DNA bound by TBP is bent. E. Two pairs of phenylalanine side chains are positioned between base pairs.
Which of the following statements relating to skeletal muscle and their functions is NOT correct?
A. Muscles that produce opposing actions at a joint are called antagonists. B. Skeletal muscles are attached to bones by tendons. C. The end of the muscle called the insertion is attached to the bone that moves when the muscle contracts. D. The origin of a skeletal muscle remains relatively stationary. E. Contraction of the hamstring muscles extends your knee.
In a family, both parents have freckles and widow's peak. Both of these traits are dominant: F = freckles, W = widow's peak. They have a child who has no widow's peak and no freckles. Which one is a possible dihybrid genotype of the child?
A) ffww B) FFww C) FfWw D) ffWw
The use of lysozyme during the preparation of cheeses and wines is effective in reducing the numbers of
A. fungi. B. viruses. C. bacteria. D. prions. E. all microbes.