What development has led to substantial reductions in the rate with which children are born with Tay-Sachs disease?
a. The use of genotyping in mate selection.
b. All of the above.
c. People refraining from having children.
d. Use of abortion.
Answer: a. The use of genotyping in mate selection.
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Which of the following is a useful mechanism of action for an antibacterial drug?
A. Inhibition of cell wall synthesis B. Interference with RNA and DNA synthesis C. Inhibition of protein synthesis D. All of the choices are correct.
The division of the nervous system that integrates sensory information and coordinates the body's response is the nervous system.
A. peripheral B. central C. somatic D. autonomic E. sympathetic
During an action potential,
a. sodium ions rush out of the cell, switching the potential to +35 mV. b. sodium ions rush into the cell, switching the potential to ?70 mV. c. sodium ions rush into the cell, switching the potential to +35 mV. d. sodium ions rush out of the cell, switching the potential to ?70 mV. e. sodium ions rapidly move in and out of different parts of the neuron, oscillating potential between ?50 and +35 mV.
Which of the following is a correct comparison of bacterial and eukaryotic chromosomes?
A. Both have a single replication origin. B. Only eukaryotes have specific sequences necessary for DNA distribution during cell division. C. Eukaryotes usually have circular chromosomes; bacteria have linear. D. Both have multiple replication origins. E. Bacteria have circular chromosomes; eukaryotes have linear.