Neuron is stimulated, the membrane potential of the plasma membrane shifts to a less negative value by opening voltage-gated k+ channels:
(a) true
(b) false

False.

Explanation:

Neuron or nerve cell may be defined as the structural and functional unit of the nervous system. The stimulation of nerve helps in the transmission of messages in the body.

Th resting membrane potential of the plasma membrane is -70mV. The maintenance of negative membrane potential is due to the presence of potassium ions. The influx of potassium ions makes the membrane more negative and influx of sodium ions makes the membrane potential less negative.

Thus, the answer is false.

B. False

Explanation:

Resting potential: When a nerve fiber is at rest, it is observed that the outer surface is positively charged and inner surface is negatively charged. This is due to differential distribution of ions (Na+ and K+) and negatively charged protein inside the cell.

Na+ ions are more outside the cell whereas K+ ions are more inside the cell.  The potential difference across the membrane under resting condition was -70 mV and is called resting potential.

When the cell is at rest, both Na+ and K+ voltage gated channels are closed. When a threshold stimulus is applied, the voltage gated Na+ channels open up, allowing Na+  ions to enter the neuron. This causes the neurons interior to develop a positive charge. The membrane is said to be depolarized and the action potential of +30 mV is obtained.  

image result for describe the various types of gene mutationsghr.nlm.nih.gov

the types of mutations include: missense mutation: this type of mutation is a change in one dna base pair that results in the substitution of one amino acid for another in the protein made by a gene. nonsense mutation: a nonsense mutation is also a change in one dna base pair.

explanation:

this protocol describes a detailed procedure for intracellular flow cytometry staining.