Vitamin A plays a critical role in night vision because:
A. it is required for the synthesis of the retinal portion of rhodopsin.
B. it is transformed into the opsins found in cone cells.
C. it acts a coenzyme in the reaction that degrades cGMP within rod cells.
D. it catalyzes the mitotic generation of light-reflecting epithelial cells, which support widely dispersed rod receptors.
E. it is a key intermediate in the signal transduction pathway within cone cells that is activated by light.
A
You might also like to view...
Which of the following anterior pituitary hormones stimulates the gonads to secrete progesterone and/or testosterone?
a) Luteinizing hormone b) TSH c) Corticotropin d) Melanocyte-stimulating hormone e) Growth hormone
The proteins in the electron transport chain transport H+
A. from the cytosol to the matrix. B. from the matrix to the outer compartment. C. from the outer compartment to the cytosol. D. from the outer compartment to the matrix. E. from the cristae to the matrix.
Controlled substances must a. be kept in a locked cabinet or safe
b. have orders, receipts, uses, and thefts recorded. c. be ordered by veterinarians who register annually with the DEA. d. All of the above are true.
Which of the following sequences correctly lists the levels of structural organization of the human body from simplest to most complex?
What will be an ideal response?