The site-specific recombinases are similar to topoisomerases in what way?
A. They introduce supercoils.
B. They require ATP hydrolysis for their activity.
C. They promote phosphoryl group transfers in which the net change in free energy is close to zero.
D. They also assist in compaction of the DNA.
E. They mediate strand invasion reactions.
C
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The structures labeled "5" are
a. trichocysts. b. micronuclei. c. flagella. d. pili. e. gullet.
The part of the brain that includes the thalamus, hypothalamus, and pineal gland is the
a. pons. b. medulla oblongata. c. dorpora quadrigemina. d. diencephalon. e. telencephalon.
Figure 25.20
Questions 27 and 28 refer to the figure above.
The letter "E" in the accompanying figure represents the ____.
A. humerus B. pectoral girdle C. skull D. sternum E. pelvic girdle
Which of the following pairs is mismatched?
A) spirochete — axial filament B) aerobic, helical bacteria — gram-negative C) enterics — gram-negative D) mycobacteria — acid-fast E) Pseudomonas — gram-positive