It took more than 100,000 years for the human

population to grow to one billion individuals
and took about ____ years to add five billion
more.
a. 200
b. 20,000
c. 100,000
d. 200,000
e. 500,000


A

Biology & Microbiology

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The leading and the lagging strands differ in that _____

A) the leading strand is synthesized in the same direction as the movement of the replication fork, and the lagging strand is synthesized in the opposite direction B) the leading strand is synthesized by adding nucleotides to the end of the growing strand, and the lagging strand is synthesized by adding nucleotides to the end C) the lagging strand is synthesized continuously, whereas the leading strand is synthesized in short fragments that are ultimately stitched together D) the leading strand is synthesized at twice the rate of the lagging strand

Biology & Microbiology

If the sequence of one strand of a DNA molecule is 5' ATGGCAT 3', the sequence of the complementary strand is:

A) 5' ATGGCAT 3' B) 3' ATGGCAT 5' C) 5' TACCGTA 3' D) 3' TACCGTA 5'

Biology & Microbiology

Grasses being replaced with shrubs over time is an example of which of the following?

a. Commensalism b. Parasitism c. Directional selection d. Evolution e. Succession

Biology & Microbiology

Attenuation in trp gene regulation is accomplished by

A) reducing permeability of tryptophan, the effector molecule. B) blocking expression of trp mRNA. C) formation of secondary mRNA structures in the leader region. D) binding with RNA polymerase. E) repression of the trp operator.

Biology & Microbiology