How are the bases of tRNAs modified?
a. They can be directly altered chemically.
b. They can be edited using a guide RNA.
c. A base may be removed and replaced with a different base.
d. Choices A and C are true.
e. Choices A, B, and C are all true.
Ans: d
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Which of the following syndromes may result from infection by an arthropod-borne virus?
A. Encephalitis, often with a high fatality rate B. Hemorrhagic fevers C. Fevers of undifferentiated type with or without a rash D. All of the choices are correct.
Karyotype analyses are performed on cells in ____ of mitosis
a. prophase b. prometaphase c. metaphase d. anaphase e. telophase
An organism that obtains its energy from sunlight is a (an)
a. autotroph. b. auxotroph. c. heterotroph. d. chemotroph. e. phototroph.
Unwinding the double helix to separate the parental strands requires a __________ protein that hydrolyzes ATP to drive the unwinding reaction.
A) primase B) DNA ligase C) DNA polymerase III D) topoisomerase E) helicase