What process or enzyme was used for Step 1 in Figure 15-1?
a. PCR
b. a bacteriophage
c. a reverse transcriptase
d. a DNA ligase
e. a restriction enzyme
E
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In this figure showing SDS-PAGE of the progressive stages of glycine N-methyltransferase purification, the marker lane indicates that the purified protein:
A. has approximately 32,000 amino acids. B. has a molecular mass of approximately 32,000. C. has a positive charge and a molecular mass of approximately 32,000. D. has a negative charge and a molecular mass of approximately 32,000. E. is only present when cells are induced with glycine.
Scientists want to determine whether chemical X, a component of fertilizer, is harmful to fish. They treat fish in the
laboratory with increasing amounts of the chemical for one week and then measure their viability. When researchers designed this experiment, they wrote "If chemical X is toxic, the fish will begin to look sick and die." This statement is a(n) ____.
a. interpretation b. theory c. hypothesis d. result e. prediction
The use of a drug to prevent imminent infection is called ________.
A. synergism B. competitive inhibition C. lantibiotics D. prebiotics E. prophylaxis
Trace a drop of blood from the right atrium through the entire circulatory system then back to the right atrium. Include
in your answer major heart structures and vessels. What will be an ideal response?