If protein molecules are broken down into individual atoms, which of the following elements will be found? a. sodium, potassium, calcium, zinc, manganese b. iron, magnesium, copper, chromium, boron c. lithium, aluminum, phosphorus, chlorine, iodine d. nitrogen, carbon, hydrogen, oxygen, sulfur

D. nitrogen, carbon, hydrogen, oxygen, sulfur

Explanation:

Proteins are giant organic molecules. The monomers that combines to form proteins are the amino-acids.

The atoms that makes up the amino-acids units of proteins are carbon, hydrogen, oxygen, Nitrogen and sometimes sulphur.

Not all amino acids contains sulfur in their structure.

These atoms are also the atoms that makes up proteins when they are broken down.

humans are now responsible for causing changes in the environment that hurt animals and plant species. we take up more space on earth for our homes and cities. we pollute habitats. human activity often changes or destroys the habitats that plants and animals need to survive.

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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