QUESTION 143 A genome-wide association study has found several single-nucleotide polymorphisms (SNPs) associated with test-taking skill in a particular region on the long arm of chromosome 4. A search of the human genome sequence shows that this chromosomal region contains a gene of previously unknown function. This gene encodes a protein that has not only a signal sequence but also seven hydrophobic sequences, each about 20 amino acid residues long. What kind of protein is most likely encoded by this gene? O A voltage-gated ion channel. A hormone receptor that is linked to proteins. A hormone receptor with a tyrosine-specific protein kinase activity. A ligand-gated ion channel. O A cytoplasmic protein kinase.

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