When a neuron is at rest, the concentration of K+ ions is greater outside of the cell
1.True
2.False
2
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In gene regulation and control, repression is defined as the:
a. internal change in the original nucleotide sequence of a gene or genes within an or-ganism's genome. b. mechanism of genetic control in which genes are induced only when the substrate to be degraded by enzymatic action is present. c. change of the bacterial genotypes through the exchange of DNA from one cell to another. d. mechanism of genetic control in which genes are not transcribed and therefore are not expressed in the presence of those target products in sufficient supply.
Hair cells of the inner ear begin to show damage when exposed to sound louder than ____
a. 20-30 decibels b. 40-50 decibels c. 55-65 decibels d. 75-85 decibels e. 100 decibels
Which of the following hormones promotes fruit ripening and dropping of leaves?
A) auxin
B) ethylene
C) gibberellin
D) abscisic acid
Reduction of nitrogen-oxygen ions and compounds by some bacteria is called
A. aerobic respiration. B. denitrification. C. deamination. D. nitrification. E. fermentation.