Gprotein-coupled receptors are important molecules involved in signal transduction.
which statement about g protein-coupled receptors is true?
a. they are activated only by steroid hormones.
b. they bind both adenine and guanine nucleotides.
c. they generally contain seven membrane-spanning α helices.
d. they bind only guanine nucleotides.

C. They generally contain seven membrane-spanning α helices.

Explanation:

The G protein-coupled receptors are components of signal transduction through G protein. Here, a plasma membrane receptor with seven transmembrane helical segments serves as a G-protein coupled receptor. These receptors are the integral membrane proteins and have seven hydrophobic regions of 20 to 28 amino acid residues.

These hydrophobic alpha-helices span the membrane back and forth seven times. Binding of a signaling molecule to the G-protein coupled receptor promoters a conformational change in the receptor’s intracellular domain. The activated receptor then triggers the replacement of bound GDP to the G protein by GTP and thereby activating it.

rising sea temps which are causing coral reefs to bleach and die out

glaciers are melting causing sea levels to rise wgich could flood out land

explanation:

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