Which of the following statements about hormone synthesis is NOT correct?
A. Progesterone can be a precursor of cortisol.
B. Progesterone is a precursor of mineralocorticoid and glucocorticoid hormones.
C. Pregnenolone is a precursor for all steroid hormones.
D. Tryptophan is a precursor for thyroid hormones.
E. Peptide hormones are polymers of amino acids.
D
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The concave medial border of the kidney is called the ________.
Fill in the blank(s) with the appropriate word(s).
The relative concentrations of Na+and K+ remain constant during a single action potential despite movement of these ions across the membrane because
A) They cross back immediately through recovery channels. B) They are pumped back across using the Na+/K+ ATPase pump. C) They are forced back across the membrane as the action potential moves away. D) The refractory periods do not end until all ions have been returned to their original areas.
Cradle cap in infants is called ________
Fill in the blanks with correct word
Which organelle modifies, sorts, and packages proteins and lipids for export from the cell?
A) endoplasmic reticulum B) Golgi apparatus C) mitochondrion D) cytoskeleton