In the experiment of avery, mcleod, and mccarty, the addition of rnase and protease (but not dnase) to the dna extracts yielded which of the following outcome? select one: a. prevented the conversion of type s bacteria into type r bacteria. b. allowed the conversion of type s bacteria into type r bacteria. c. prevented the conversion of type r bacteria into type s bacteria. d. allowed the conversion of type r bacteria into type s bacteria.

The correct answer will be option-D

Explanation:

Avery, McLeod, and McCarty performed the experiment to test the chemical nature of the transforming principle.  

The transformation experiment was performed by the Griffith in 1928 which results in the transformation of the avirulent R bacteria strain to virulent S bacteria as S bacteria released a transforming chemical in the solution which transformed the R bacteria to S bacteria.

Since DNase help digest the DNA molecules present in the solution therefore this showed that the transforming principle which turned the R bacteria to S bacteria is DNA.

Thus, option-D is the correct answer.

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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