The simplest nerve pathway is
a. located in the midbrain.
b. the reflex pathway.
c. found in the lower part of the brain.
d. found in the autonomic nervous system.
e. in the flow of information from a sense receptor to the brain.
B
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A scientist is searching for chemical compounds involved in embryonic limb development. He discovers a new compound that is transiently expressed in the limb, and only seems to affect cells in its immediate vicinity (up to a few cell lengths away)
How should the scientist classify this chemical compound? A. as an amine hormone B. as a peptide hormone C. as a steroid hormone D. as a paracrine factor E. as a neurotransmitter
Answer the following statements true (T) or false (F)
1. The movement of DNA polymerase continues unimpeded if a thymine dimer is present in the DNA double helix. 2. Cells are normally limited to one DNA repair system that corrects DNA mistakes. 3. Patients who suffer from xeroderma pigmentosum (XP) have a defective mismatch repair system. 4. Cancers originate from a single cell.
Which of the following statements is TRUE of restriction enzymes?
A. they are not naturally produced by bacteria, but are bioengineered by humans. B. they protect bacterial cells from invasion by foreign DNA. C. they cut at random sites within a genome. D. they cleave DNA only at sites of adjacent thymine bases. E. there are less than 10 restriction enzymes known.
Which of the following does not occur when you are very, very cold?
A. You get goose bumps. B. The arrector pili muscles contract. C. Shivering occurs. D. Smooth muscle contracts inside the blood vessels supplying the skin. E. More blood flows to the surface of the body.