The innermost layer of the root cortex, known as the ____, is a selectively permeable barrier that helps control the
movement of water and dissolved minerals.
a. endodermis
b. root cap
c. quiescent center
d. pericycle
e. root hairs
ANSWER: a
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A transposable element composed of an antibiotic resistance gene, a recombinase gene, and inverted repeats is identified in a bacterial genome. This element can be any of the following except
A. an integrated conjugative element. B. a composite transposon. C. an insertion sequence. D. a unit transposon.
Which statement is NOT true about DNA replication?
A. It occurs more rapidly in bacteria than in eukaryotes. B. One strand of new DNA is replicated faster than the other strand at the replication fork. C. DNA replication is considered semiconservative because there is always an old strand acting as a template for a new strand. D. It proceeds in a 5'-to-3' direction only. E. DNA can only replicate at one point on a chromosome at one time.
Given the problems related to fossilization listed in the text, which of these creatures would be least likely to be successfully fossilized?
A) turtle B) rose flower C) rhinoceros D) clam
The mass number is the ____ rounded to the nearest whole number.
A. atomic mass B. number of protons C. atomic number D. number of electrons