Once an action potential is triggered, there is a: A. reversal of the membrane p

Question

Once an action potential is triggered, there is a: A. reversal of the membrane polarity, with the interior of the cell becoming positively charged B. reversal of the membrane polarity, with the interior of the cell becoming negatively charged C. sudden rush of potassium into the neuron D. sudden impermeability of the membrane to the transport of ions Phospholipids and triglycerides differ in which of the following? A. the number of fatty acids attached to the glycerol molecule B. the glycerol molecule C. the carbon to carbon bonds D. lipids of the cell membrane do not have hydrophobic sections of the molecule E. both B and C which lymphatic organ plays the most essential role in T-Cell maturation? A. bone marrow B. lymph nodes C. spleen D. thymus E. Peyer's patches Which of the following is are the reason(s) that plants wilt on a hot summer day? A. loss of water B. lack of torpor pressure C. heat weakens the plant cell walls D. all of these E. only A and B A protein is a polymer made up of which kind of monomers? A. monosaccharide's B. amino acids C. nucleotides D. alternating sugar and phosphate groups E. fatty acids and glycerol Which statement is NOT true about the pH scale? A. The scale indicates the relative concentrations of hydrogen and hydroxyl ions in a solution. B. pH 7 has a balanced level of H^+ and OH^_ C. Anything below pH7 is acidic and above pH7 is basic D. A change of one pH unit represents a ten-fold increase or decrease in hydroxyl ion concentration E. All are true

Explanation / Answer

48)A

Action potential is a moving exchange of ions that runs along the length of axon.

49)A

Triglyceride contains three faaty acid attached to Glycerol while a phospholipid has two fatty acids and one phosphate group attached to glycerol.

5o)D

the Thymus constitute the primary lymphatic organ and the site of maturation of T cells.

51)E

Plants wilt due to water loss and fall in Turgor pressure.

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