Why are g-protein coupled receptors often known as 7tm receptors? a. they have 7 transmembrane β-pleated sheets. b. they have 7 transmembrane α-helices. c. they have 7 tyrosine-methionine dipeptides in their structure. d. they have 7 methionine-tryptophan dipeptides in their structure.

B

Explanation:

G protein-coupled receptors (GPCRs), also known as seven-(pass)-transmembrane domain receptors, 7TM receptors, heptahelical receptors, serpentine receptor, and G protein–linked receptors (GPLR),comprises of a large protein family of receptors that discover molecules outside the cell and initiate internal signal transduction pathways and, eventually, cellular responses. They are called seven-transmembrane receptors because they pass through the cell membrane seven times

it is either c or d and i know for sure it is not a or b

her next move would be to use agarose gel electrophoresis to separate the dna molecules of varying length and create a dna fingerprint.