Which of the following is true with respect to mutagens? mutagens are chemical or physical factors that increase the rate of mutation. mutagens are the genes that cause mutation. mutagens are inheritable characters that develop mutation.

Mutagens are chemical or physical factors that increase the rate of mutation.

Explanation:

A mutation is a change that occurs in the genetic make up of the organism. A mutagen is a chemical or physical agent which is capable of causing changes in the genetic material of the organism typically in DNA. They are expected to increase the rate of mutations. Generally the mutagens like radiations and chemicals are carcinogenic. These mutagens result in chromosomal instability, rearrangement of the chromosomes, deletion, inversion and translocation and chromosomal breakage.

c

explanation:

the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

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