DNA varies from species to species in _____
a. how many adenine bases bind with thymine rather than with cytosine
b. whether DNA is a double or a single helix
c. the variation in the backbone structure
d. how many different bases it contains
e. the sequence of its base pairs
ANSWER: e
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The ideal environment for the growth of fungi, such as mushrooms, is
a. damp and dark. b. damp and light. c. dry and dark. d. dry and light
Multi-cellularity is believed to have evolved multiple times on Earth
Indicate whether the statement is true or false.
Some companies that produce paper will also produce a by-product that is sold as a binder (something that binds, or holds, things together). From which part of trees does this by-product come?
A) leaves B) mycorrhizae C) lignin D) stomata
Some time later, she finds that the introduced strand separates into single-stranded RNAs, one of which is degraded. What does this enable the remaining strand to do?
A) attach to histones in the chromatin B) bind to complementary regions of target mRNAs C) activate other siRNAs in the cell D) bind to noncomplementary RNA sequences