Darwin’s primary scientific achievement was identifying the ____

a. method for estimating the age of fossils
b. idea that organisms change over time and form new species
c. process by which genes are passed from one generation to the next
d. concept of gene pools and changes in allele frequencies
e. mechanism by which populations of organisms change over time


ANSWER: e

Biology & Microbiology

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The E. coli lac operon has ________ operator sequences.

A. four B. two C. three D. one

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Level of education and availability of educational opportunities have a strong impact on a country's ability to have a strong economy

Indicate whether this statement is true or false.

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where a person has sex and also the birth canal

What will be an ideal response?

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In the trp operon, attenuation occurs through translation of two Trp codons in the leader sequence. What would happen if these two codons were mutated to stop codons?

A) Region 1 will bind to region 3 in the absence of Trp. B) The antiterminator loop will form in the presence or absence of Trp. C) Region 3 will bind to region 4 in and transcription will proceed in the presence or absence of Trp. D) Region 3 will bind to region 1 in the presence of Trp.

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