What type of mutation alters the base but not the amino acid being coded for?
A. Silent
B. Nonsense
C. Back
D. Point
E. Missense
Answer: A
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Which of the following would be most effective and practical for routine home disinfection of a toothbrush between uses?
A. Hydrogen peroxide B. 70% Isopropyl alcohol C. Bleach D. Glutaraldehyde
Which of the following is derived from the ground tissue system?
A) root hair B) cuticle C) periderm D) pith E) phloem
Four of the five time periods listed below represent
milestones in the evolution of life on Earth. Select the exception. a. 12 to 15 billion years ago b. 3.2 billion years ago c. 2.1 billion years ago d. 570 million years ago e. 200 million years ago
In karyotyping, individual chromosomes may be distinguished from others by
a. a comparison of chromosome lengths. b. bands produced on chromosomes by differential staining. c. the position of centromeres. d. the relative lengths of the "arms." e. all of these.