What is the most challenging issue facing genome sequencing?
a. the inability to develop fast and accurate sequencing techniques
b. the ethics of using information from genomes at the individual level
c. the availability and stability of DNA
d. the use of recombinant DNA technology by drug manufacturers
b. the ethics of using information from genomes at the individual level
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Neuroglial cells
a. metabolically support other neurons. b. form sheaths around neurons and increase the rate of impulse transmission. c. form more than half of the volume of the brain. d. provide physical support. e. do all of these.
Why does extended hypoglycemia (low blood sugar) lead to confusion and difficulty thinking?
A. Glucose provides energy for brain cells. B. Unregulated pH of body fluids causes these symptoms. C. Glucose is major source of energy for non-nervous system cells. D. Glucose is required for chemical reactions in the body.
What is the correct order for the following events in excision repair of DNA? (1) DNA polymerase I adds correct nucleotides by 5?-to-3? replication; (2) damaged nucleotides are recognized; (3) DNA ligase seals the new strand to existing DNA; (4) part of a single strand is excised.
a. 1, 2, 3, 4 b. 2, 1, 3, 4 c. 2, 4, 1, 3 d. 3, 4, 2, 1 e. 4, 2, 3, 1
Which of the following trends in evolution of the nervous system refers to the formation of a distinct head that has a large concentration of neurons?
A. Cephalization B. Ganglion C. Brain D. Peripheral nervous system E. Central nervous system