In prokaryotes, the form of RNA polymerase that can accurately initiate synthesis of RNA is called
A. the core polymerase.
B. the holoenzyme.
C. the sigma subunit.
D. RNA polymerase II.
E. RNA polymerase III.
Answer: B
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Hepatitis B and C are transmitted via the
A) oral route. B) parenteral route. C) dermal route. D) ophthalmic route.
Tetanus antitoxin is
A. antibody against the bacteria. B. inactivated toxin. C. inactivated bacteria. D. antibody against the toxin
King Frederick William of Prussia failed in his attempts to create an army of giants because of all the
following reasons except one. Select the exception. A. Human life spans are too long. B. Children of the crosses were actually shorter than their parents. C. Size in humans is too complex a trait. D. There was too much resistance to his program because of ethical considerations. E. There are no exceptions. All of these reasons are correct.
Catastrophic destructions, like the one caused by the impact of a bolide with earth at the end of the Cretaceous, create opportunities for new types of biological associations. In the case of the end-Cretaceous catastrophe:
A) mammals and birds filled ecological vacancies left by dinosaurs. B) ammonites filled ecological vacancies left by trilobites. C) conifers filled ecological vacancies left by large primitive trees and ferns. D) humans quickly became the dominant species on the planet.