In Figure 8.2, if base 4 is thymine, what is base 4'?
A) Thymine
B) Guanine
C) Cytosine
D) Adenine
E) Uracil
D) Adenine
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The connection that exists between genes and hereditary traits is based on using the information encoded in genes to synthesize
A. codons. B. nucleotides. C. proteins. D. histones. E. complementary bases.
Specific amino acids are attached to tRNA molecules by
A. aminoacyl-tRNA synthetases. B. hydrogen bonds. C. anticodons. D. deactivating enzymes. E. initiation factors.
Today, the fossil record
A. can be dated only with one layer in relation to older layers below and younger layers above, no actual dates can be estimated. B. can be dated reasonably well only with uranium-238. C. can be dated reasonably well using a variety of radioactive isotopes with known half-lives. D. can be dated precisely, to within a single year, using radioactive isotopes. E. can be dated precisely, to within a single year, using DNA hybridization.
During exhalation, the diaphragm _______.
A. contracts and moves down B. relaxes and moves up C. relaxes and moves down D. contracts and moves up