A nucleic acid contains uracil, allowing you to conclude that:
A. this nucleic acid is DNA.
B. this nucleic acid is RNA.
C. this nucleic acid could be either DNA or RNA.
B
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A ________ infection is one in which the virus quits reproducing and remains dormant for a period before becoming active again.
A. slow virus B. latent C. persistent D. None of the choices are correct.
Zircon crystals form from volcanic rock. The age of zircon crystals can be precisely measured. What exactly is measured in zircon crystals?
What will be an ideal response?
The layer of the heart wall that is the visceral pericardium is also called the
A. endocardium. B. myocardium. C. epicardium. D. chordae tendineae. E. mediastinum
The process of turning solar energy into chemical energy by plants:
a. photosynthesis b. respiration c. fermentation