What structure in the RNA polymerase of bacteria helps keep the transcription bubble open?
A. the rNTP entry channel
B. the DNA entry channel
C. the pin structure
D. the RNA exit channel
E. the RNA entry channel
C
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Which molecule dissolves in water vapor and falls as acid precipitation?
a. sulfuric acid b. ozone c. mercury d. sulfur dioxide e. carbonic acid
DNA replication involves all of the following steps except
a. separation. b. joining. c. production of single-stranded DNA molecules. d. complementary base pairing. e. polymerization.
The values obtained when measuring the blood pressure, such as 120/80 mmHg,
A. Reflect the pressure in the major arteries during ventricular systole and diastole, respectively B. Exactly match the pressures inside the ventricle during systole and diastole, respectively. C. Exactly match the pressures inside the ventricle during systole and diastole, respectively, and reflect the pressure in the major arteries during ventricular systole and diastole, respectively. D. Are the same on both the pulmonary and systemic circuits.
The most shallow soils occur in or on
A) steep slopes. B) native grasslands. C) valleys. D) floodplains.