The antidiuretic hormone works on ____ that encourages the kidneys to reabsorb water.
A. a positive feedback loop
B. a negative feedback loop
C. the proximal tubules of nephrons in the kidney
D. the action potential
E. the muscle tissue
Answer: B
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Why is it necessary to include the ?-galactosidase gene in a BAC?
A. ?-galactosidase is a negative selectable marker. B. ?-galactosidase is a positive selectable marker. C. ?-galactosidase confers resistance to several antibiotics. D. Presence of ?-galactosidase indicates cloned DNA segment is present. E. Absence of ?-galactosidase indicates cloned DNA segment is present.
DNA fragments can be separated by size on a gel, but then must be transferred to filters for probing
and further analysis. The technique used to transfer DNA to the filters is called ____________________. Fill in the blank(s) with the appropriate word(s).
Your cells most readily obtain energy from
A. C6H12O6. B. Glyceraldehyde-3-phosphate. C. ATP. D. NADH2.
Which of the following types of cells is NOT infected by HIV?
A) T cells B) B cells C) macrophages D) monocytes E) microglia