One of the best exercises for people with leg or foot problems is running.
a. true
b. false
b. false
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__________ moves food down the esophagus and through a(n) __________ (a ring of muscle that can close off an
opening) into the stomach. Fill in the blank(s) with the appropriate word(s).
All of the statements below are true. Select the statement that best supports the view of most biologists that viruses are nonliving.
a) The viral genome may be single-stranded or double-stranded RNA or DNA. b) Viruses are obligate intracellular parasites. c) An isolated virus is unable to replicate its genes or regenerate ATP.
A developmental theory is a systematic statement of general principles that provides a framework for understanding how and why people change as they grow older.
Indicate whether the statement is true or false.
RNA is believed to have preceded DNA because _____.
A. DNA contains thymine and RNA does not. B. DNA is double stranded and requires more components. C. DNA can store more protein-building instructions in less space. D. RNA can also function as an enzyme. E. RNA cannot replicate itself.