The bond in table salt (NaCl) is ____
a. polar
b. ionic
c. covalent
d. double
e. nonpolar
ANSWER: b
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When compared to the leg muscles of an Olympic sprinter, the muscles of an Olympic marathoner would likely show a greater proportion of slow-twitch fibers
A. true B. false
Why does the polymerase chain reaction require the samples to undergo numerous cycles, each
containing three different temperatures?
a. The initial cycles don't produce many copies of the original gene since the amplification is exponential in nature. b. The three temperatures are for different processes; the highest temperature separates the double stranded DNA into single strands, the lower temperatures allow a target primer to bind and a DNA polymerase to generate new sequences. c. The enzyme used is from an organism that thrives in high temperatures, so high temperatures must be used. d. Non-target DNA is made during the first 10 cycles so further cycles are required to specifically amplify the target DNA. e. Once the enzyme starts working, you cannot stop the reaction until there are no more nucleotides.
In an ionic bond,
A. two atoms are attracted by partial positive and negative charges. B. two atoms are attracted by the same charges. C. atoms attract each other by sharing electrons to fill their valence shells. D. atoms, having gained or lost electrons, attract one another with opposite charges. E. two atoms both become strongly electronegative and attract each other.
Which of the following structures would be impacted by a bacterial infection of the inner ear?
A. semicircular canal, tympanic membrane, ear lobe, and vestibular nerve B. semicircular canal, cochlear nerve, vestibular nerve, and cochlea. C. auditory canal, cochlear nerve, malleus, and vestibular nerve D. pinna, stapes, vestibule, and cochlear nerve