Which of the following mutations is most likely to cause a phenotypic change?
A) a duplication of all or most introns
B) a large inversion whose ends are each in the same region between genes
C) a nucleotide substitution in an exon coding for a transmembrane domain
D) a single nucleotide deletion in an exon coding for an active site
E) a frameshift mutation one codon away from the end of the nontemplate strand
Answer: D
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In DNA the pyrimidines are
a. thymine and cytosine. b. adenine and cytosine. c. adenine and guanine. d. thymine and adenine. e. guanine and thymine.
There are occasions when theoretical expectations do not match with actual outcomes, as you see in the case of zygote formation leading to genetic drift. This discrepancy is known as ________
A) sampling bias B) sampling error C) nonrandom mating D) random mutations
What is the nucleotide sequence on a section of DNA where transcription begins?
A) polymerase B) palindrome C) promoter D) codon
What are staple crops?
A) the major agricultural sources of calories in a society B) the plants in which the gametophyte stage is dominant C) the manioc plants eaten by people in Europe D) the vegetative organs of grasses