You are walking along and you see a plant that is small, green, and growing close to the ground. When you look more closely, you see it has a very flexible stem and no leaves, but leaf-like structures. You are most likely observing a(n):
A. angiosperm.
B. gymnosperm.
C. lycopodium.
D. moss.
E. fern.
D
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In order for a G protein to be active:
A. the alpha subunit must bind GTP. B. the beta and gamma subunits must separate from the alpha subunit. C. both the beta and gamma subunits must bind GTP. D. the alpha subunit must bind GTP and the beta and gamma subunits must separate from the alpha subunit.
Supercoiling has been observed in:
A. chromosomal DNA. B plasmid DNA. C. genomes of double-stranded DNA viruses. D. most circumstances where double-stranded DNA is present in the cell. E. most circumstances of double-stranded cellular DNA, but not double-stranded viral DNA.
Microfilaments are made from what protein?
a. myosin b. actin c. troponin d. histones e. chromatin
One strand of DNA serves as a template for the synthesis of another so that __________.
A. the progeny of each cellular replication gets the same genetic information B. there are two copies of each gene on a single DNA molecule C. DNA can serve as a template for the synthesis of other polymers D. the helical shape of DNA is conserved