Which explains a difference between prokaryotic and eukaryotic gene reguation? A.
Prokaryotes do not have mRNA, so they do not have processes to degrade mRNA
B.
Prokaryotes process DNA in the nucleus, so genes do not need to be activated.
Eukaryotic gene regulation is controlled by more than one promoter and one regulator.
D
Eukaryotes utilize operons, so they do not need to produce sections of mRNA
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Which identifies the main purpose of biological taxonomy?

The concept of keystone species is controversial among ecologists because most organisms are highly interdependent. if each of the trophic levels is dependant on all others how can we say one is most important

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.