Prior to using PCR to introduce mutations into DNA in vitro, what was a common method of mutagenesis used by scientists?
A. Physical manipulation of DNA (e.g. vortexing)
B. Chemicals to induce mutations
C. Self-fertilization of plants or inbreeding of animal models
D. Using only old parents to set crosses in plants and animals
Answer: B
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Identify the structure indicated by #5:
A. epididymis B. seminal vesicle C. testis D. vas deferens E. prostate gland
Neurons that convey impulses from the CNS to muscles or glands are
A. effectors. B. receptors. C. oligodendrocytes. D. neurotransmitters. E. none of the above.
Exercise can trigger an asthma attack. This is especially true if someone goes for a long run on a cold morning. The two main causes of narrowing of the bronchiole passageways can be treated with drugs that act in different ways. What are the two causes
of this narrowing, and how can drugs work to counteract these conditions? What will be an ideal response?
Organisms that are not drastically affected by increased pressure are called ________.
A. barophilic B. barotolerant C. osmophilic D. osmotolerant