Nucleic acids and carbohydrates are both types of what? a. elements b. atoms c. proteins d. macromolecules

(D). Macromolecules.

Explanation:

Macromolecules are very large molecules, made up of many smaller subunits. These subunits are known as monomers that combine together to for macromolecule. Nucleic acids and carbohydrates are examples of macromolecule.

Nucleic acids are formed by polymerization of nucleotide molecules (made up of sugar, nitrogen base, and phosphate groups), which complex carbohydrates are formed by polymerization of monosaccharides, such as glucose.

Thus, the correct answer is option (D).

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explanation:

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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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