Mutations in scn9a, a voltage-gated k+ channel can lead to individuals not being able to perceive pain.
a. true
b. false

False.

Explanation:

SCN9A gene may be defined as a type of transcription factor responsible for the regulation of the voltage gated sodium channels. These genes are mainly expressed in nociceptive or pain receptor.

The mutation in SCN9A may disrupt the functioning of voltage gated sodium channels and not related with voltage gated potassium channels. The person is not able to feel the pain due to mutation on SCN9A gene.

Thus, the correct answer is option (b).

step 1: initiation

initiation is the beginning of transcription. it occurs when the enzyme rna polymerase binds to a region of a gene called the promoter. this signals the dna to unwind so the enzyme can ‘‘read’’ the bases in one of the dna strands. the enzyme is now ready to make a strand of mrna with a complementary sequence of bases.

step 2: elongation

elongation is the addition of nucleotides to the mrna strand. rna polymerase reads the unwound dna strand and builds the mrna molecule, using complementary base pairs. there is a brief time during this process when the newly formed rna is bound to the unwound dna. during this process, an adenine (a) in the dna binds to an uracil (u) in the rna.

step 3: termination

termination is the ending of transcription, and occurs when rna polymerase crosses a stop (termination) sequence in the gene. the mrna strand is complete, and it detaches from dna.