1) When threshold (-55 mV) is reached: a) voltage-gated K+ channels immediately open. b) Na+ enters through voltage-gated channels. c) the inactivation gate on Na+ channels opens. d) K+ leak channels close. 2) At the peak of an action potential (choose the two correct answers): a) voltage-gated K+ channels are open. b) K+ leak channels close. c) voltage-gated Na+ channels inactivate. d) voltage-gated Na+ channels close.
Nucleotides
It is an organic molecule made up of three basic components- a nitrogenous base, phosphate,and pentose sugar. The nucleotides are important for metabolic reactions andthe formation of DNA (deoxyribonucleic acid) and RNA (ribonucleic acid).
Nucleic Acids
Nucleic acids are essential biomolecules present in prokaryotic and eukaryotic cells and viruses. They carry the genetic information for the synthesis of proteins and cellular replication. The nucleic acids are of two types: deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). The structure of all proteins and ultimately every biomolecule and cellular component is a product of information encoded in the sequence of nucleic acids. Parts of a DNA molecule containing the information needed to synthesize a protein or an RNA are genes. Nucleic acids can store and transmit genetic information from one generation to the next, fundamental to any life form.
1) When threshold (-55 mV) is reached:
a) voltage-gated K+ channels immediately open.
b) Na+ enters through voltage-gated channels.
c) the inactivation gate on Na+ channels opens.
d) K+ leak channels close.
2) At the peak of an action potential (choose the two correct answers):
a) voltage-gated K+ channels are open.
b) K+ leak channels close.
c) voltage-gated Na+ channels inactivate.
d) voltage-gated Na+ channels close.
Step 1
The membrane potential is the transmembrane electric potential difference measured from within the neurons relative to the potential of the extracellular fluid which by convention is taken as zero. The difference is measured in millivolts (mV). The membrane potential of a resting nerve cell is known as resting potential whereas, that of an excited or active nerve cell is known as the action potential. The rising membrane potential of nerve cells is -70 mV with a range of -40 mV to -90mV.
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