What are the "highly specific molecular scissors" that cut DNA?
A) plasmids
B) anticodons
C) codons
D) restriction enzymes
D
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Motor neurons release the neurotransmitter acetylcholine (ACh) and acetylcholinesterase degrades ACh in the synapse. If a neurophysiologist applies onchidal (a naturally occurring acetylcholinesterase inhibitor produced by the mollusc Onchidella binneyi)
A) paralysis of muscle tissue B) gradual loss of resting potential C) convulsions due to constant muscle stimulation D) decrease in the frequency of action potentials E) no effect
Water is most dense and thus heaviest at 4?C. At 0?C, ice forms and the ice can float on liquid water. Suppose ice were more dense than water at 0?C. What would happen in a lake at this temperature?
A. The ice would cover the bottom of the aquatic system and would build up in layers over time. B. Ice would not form because solids are always less dense than liquids. C. The ice would cover the surface of the aquatic system and would never melt. D. The cold temperatures and the subsequent ice formation would prevent hydrogen bonds from forming between the water molecules, thus causing the existing ice crystals to become disassociated from each other.
Linked genes are usually ________
A) found on the X chromosome B) found on the Y chromosome C) codominant D) located close together on a chromosome
In converting carbohydrates into fats, acetyl molecules are combined to form
A. amino acid. B. glycerol. C. fatty acid. D. keto acid.