Each adenine-thymine base pair has ________ hydrogen bonds, while each guanine-cytosine base pair has ________ hydrogen bonds
A) two / one
B) two / three
C) four / three
D) three / two
Answer: B
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An organism's environment consists of __________.
Fill in the blank(s) with the appropriate word(s).
Most CO2 is transported to the lungs in which of the following ways?
A) dissolved in the plasma B) as carbonic acid C) bound to water D) attached to hemoglobin or as bicarbonate ions
The BOD is a measurement of the amount of bacteria present before and after the sewage treatment process
Indicate whether the statement is true or false
Alternative exons can arise through the duplication and divergence of existing exons. What type of mutation below would be least tolerated during the evolution of a new exon?
(a) a nucleotide change of A to G (b) a deletion of three consecutive bases (c) mutation of the first nucleotide in the intron (d) a nucleotide change that alters a TT dinucleotide to AA