Bacteria are grown in 15N (heavy) medium and then transferred to 14N (light) medium and allowed to replicate for 1 generation. The DNA is subsequently isolated and centrifuged in a CsCl2 gradient to yield what type of gradient band(s)?
A. one heavy band
B. one light band
C. one half-heavy (intermediate to heavy and light) band
D. one heavy and one half-heavy band
E. one heavy and one light band
C. one half-heavy (intermediate to heavy and light) band
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The chromosomes align at the midpoint of the spindle during _____
a. prophase b. metaphase c. anaphase d. telophase e. interphase f. cytokinesis
The membrane-attack complex is a group of proteins that supplements the inflammatory response
a. True b. False
What is the function of alveolar pores?
A) speed the rate of diffusion B) equalize pressure in the lungs C) allow for exhalation of H2O formed during cellular respiration D) allow for nutrients to reach the alveolar cells E) a portal for diapedesis
The preferred preventative measure for polio in the United States is the
A. inactive vaccine developed by Albert Sabin. B. oral, active vaccine developed by Albert Sabin. C. oral, active vaccine developed by Jonas Salk. D. inactive vaccine developed by Jonas Salk. E. No preventative measures are used because polio has been eradicated in the United States.