Which of the following would NOT be considered a cell-surface receptor?

A. a receptor that binds a nonpolar steroid
hormone and activates transcription
B. a receptor that allows ions to enter the cell
when a ligand binds
C. a receptor that causes GDP to be
exchanged for GTP in a G protein
D. a receptor that must form a dimer after
binding the ligand to transmit a signal


A

Biology & Microbiology

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The _____ is where gas exchange with the pulmonary capillaries occur. It’s comprised of _____ epithelial cells.

Fill in the blank(s) with the appropriate word(s).

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What will be an ideal response?

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