Selective breeding, DNA testing, and genetically modifying crop plants are all applications of
A.) DNA replication.
B.) genetic mutations.
C.) biotechnology.
D.) environment-genotype interactions.
Ans: C.) biotechnology.
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Which excitatory neurotransmitter is responsible for muscle contraction in vertebrates?
A. dopamine B. norepinephrine C. nitrous oxide D. glutamate E. acetylcholine
To observe the three-dimensional structure of a cell the best type of microscopy would be
A. fluorescence microscopy. B. standard light microscopy. C. scanning electron microscopy. D. differential-interference light microscopy. E. transmission electron microscopy.
It is possible to remove calcium from compact bone by soaking the bone in vinegar for an extended period of time. Once the calcium is gone, the bone should be
A) more rigid and inflexible. B) about half the size as before soaking. C) extremely flexible. D) completely dissolved.
_______ is the main sugar transported in phloem; plant biologists think it is less vulnerable to ________ than monosaccharides.
A. Glucose; metabolic breakdown B. Sucrose; phloem loading C. Sucrose; metabolic breakdown D. Glucose; guttation