Yeast genes contain ________ introns than those of most eukaryotic organisms
a. more
b. fewer
c. longer
d. duplicated
Answer: B
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Select the plant behavior that arises from internal stimuli.
A. Phototropism. B. Thigmotropism. C. Cytokinins promoting cell division. D. Nondevelopmental formation of aerenchyma.
Clues from geology and paleontology suggest that simple cells, or their precursors, arose about _____ years ago.
A. 6 million B. 4 billion C. 2 billion D. 1 million E. 3 million
Which of the following pHs is the most acidic?
a. 1 b. 3 c. 5 d. 7 e. 9
Which statement about viruses is FALSE?
a. Viruses are not cellular. b. Viruses can manufacture proteins. c. Viruses cannot carry on metabolic activities. d. Viruses can only replicate by infecting other cells. e. Viruses have a protective protein coat called a capsid.