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
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The hormone responsible for cell differentiation, particularly xylem and phloem, in the roots is:
A. gibberellic acid. B. auxin. C. ethylene. D. abscisic acid. E. cytokinin.
Why may it have been an evolutionary advantage for cephalopods to have a highly reduced shell or none at all?
What will be an ideal response?
Your health care agent cannot ________
A) be younger than 12 but older that 18 years old B) be an employee of the health care provider unless he or she is a member of your family C) be any other person but your physician D) make health care decisions for you
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).