Anticodons pair with
a. codons on DNA
b. codons on mRNA.
c. codons on tRNA
d. codons on rRNA
e. messenger RNA and ribosomal RNA.
ANSWER: b
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An atom has six protons and eight neutrons. Its atomic mass is __________ atomic mass units
a. two b. four c. six d. eight e. fourteen
Which statement about rods and cones in the eye is correct?
a. Cones respond to particular wavelengths (colors) of light, while rods perceive light at low intensity without color perception. b. Rods respond to particular wavelengths (colors) of light, while cones perceive light at low intensities without color perception. c. Cones are more sensitive to single photons of light than rods. d. Nocturnal animals have a high concentration of cones and relatively few rods. e. Humans have approximately equal numbers of rods and cones, but the cones are primarily localized in the fovea.
Cartilage is found
a. in the nose. b. in the embryonic skeleton. c. in the external ear. d. between vertebrae. e. in all of these
Radioisotopes are used in all of the following scientific applications except:a
dating fossils. b. determining the sequence of genetic information in DNA. c. localization of a drug, such as marijuana. d. the treatment of cancer. e. measuring the pH of the blood