Match the class of cell-surface receptor with the best description of its function. Not all descriptors will be used
G-protein-coupled receptors ______
ion-channel-coupled receptors ______
enzyme-coupled receptors ______
A. alter the membrane potential directly by changing the permeability of the plasma membrane
B. signal by opening and closing in a ligand-independent manner
C. must be coupled with intracellular monomeric GTP-binding proteins
D. all receptors of this class are polypeptides with seven transmembrane domains
E. discovered for their role in responding to growth factors in animal cells
G-protein-coupled receptors ___D___
ion-channel-coupled receptors ___A___
enzyme-coupled receptors ___E___
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While other types exist, Type II restriction endonucleases are by far the most commonly used enzymes for genetic engineering
Indicate whether the statement is true or false.
What term is used for multiple effects from a single gene?
a. expressivity b. continuous variation c. codominance d. pleiotropy e. multiple alleles
Suppose that a pink snapdragon (CRCW) is crossed with a white snapdragon (CWCW). What percentage of the progeny will be red?
a. 75% b. 50% c. 25% d. 0%
Identify the winter solstice, summer solstice, vernal equinox, and autumnal equinox in the picture. Briefly describe the position of the Earth in relation to the sun and the time of year each event occurs. 
A.________B.________C.________D.________
What will be an ideal response?