Which of the following is found at the 5' end of a DNA strand?
A) a phosphate group
B) a hydrogen bond
C) a hydroxyl group
D) histones
E) a methyl group
A
Bloom's Taxonomy: Comprehension
Section: The Structure and Replication of Genomes
Learning Outcome: 7.2
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The most stable—that is, least reactive—form of carbon is:
A. ethanol. B. diamonds. C. glucose. D. pyruvate. E. carbon dioxide.
Archaea use molecules with reactive side chains in their plasma membrane, so the tails of archaeal phospholipids form covalent bonds with one another. As a result, the plasma membrane is ____
a. more fluid b. less rigid c. less fluid d. able to contain more membrane proteins e. easily disturbed
Which of the following is least likely to be a
cause of extinction? a. asteroid impact b. human activity c. adaptive radiation d. continental drift e. climate change
Which species has been affected by global climate change?
a. polar bear b. sharks c. woodpeckers d. grizzly bears e. tree frogs