Jacob, Wollman, and others developed a linkage map of E. coli that is based on time. What form of recombination is involved in generating a linkage map based on time?
A) conjugation
B) transformation
C) time of transfer
D) transduction
E) adaptation
Answer: A
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Which of the following best describes the tRNA binding sites of the ribosome?
A. Only one of the three sites can be occupied by a tRNA molecule at any given time. B. Each tRNA that associates with the ribosome must first bind in the P site and then move to the A site. C. The P site contains the tRNA molecule covalently bound to the growing chain of amino acids. D. All tRNAs leave the ribosome through the A site.
Stomata close when ____ guard cells and they become ____
a. active transport pumps H+ into; turgid b. active transport of H+ stops in; flaccid c. active transport pumps H+ out of; turgid d. active transport pumps H+ into; flaccid e. active transport of H+ stops in; turgid
Which of the following is not an invasive species?
A) cheatgrass B) purple loosestrife C) ring-necked duck D) Asian longhorned beetle
Which of the following is an example of direct damage due to bacterial infection?
A) the uncontrolled muscle contractions in Clostridium tetani infection B) the invasion and lysis of intestinal cells by E. coli C) the hemolysis of red blood cells in a staphylococcal infection D) the fever, nausea, and low blood pressure in a Salmonella infection E) the excessive secretion of fluids in a Vibrio cholera infection