The segment of the nephron that is impermeable to H2O even in the presence of vasopressin is the
a. proximal tubule
b. ascending limb of the loop of Henle
c. descending limb of the loop of Henle
d. distal tubule
e. collecting tubule
B
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What is "allosteric modulation"?
A. The fact that all binding sites on a protein must be occupied to have a biological effect B. The ability of a single ligand-binding site to bind to molecularly similar ligands C. Regulation of physiological functions by the sympathetic division of the autonomic nervous system D. The change in the shape and functional state of a protein that occurs when a ligand binds to a regulatory site E. Modification of the functional state of a protein by temperature or pH
The human genome contains millions of different genes.
Answer the following statement true (T) or false (F)
The cell's ribosomal RNA (rRNA) is produced by the
A) ribosomes. B) nucleoli. C) lysosomes. D) smooth endoplasmic reticulum. E) Golgi apparatus.
PTH increases plasma Ca2+ and decreases plasma PO4
Indicate whether the statement is true or false