39. Ca2+ pumps on the endoplasmic reticulum (ER) membrane are important for A) m

Question

39. Ca2+ pumps on the endoplasmic reticulum (ER) membrane are important for A) maintaining osmotic balance B) keeping the cytsolic concentration of Ca2+ at a low level by pumping Ca2+ into ER lumen C) providing enzymes in the endoplasmic reticulum with Ca2+ ions that are necessary for their catalytic activity D) maintaining a negative membrane potential 40. The stimulation of auditory nerves depends on the opening and closing of channels in the auditory hair cells. Which type of gating mechanism do these cells use? A) voltage-gated B) extracellular ligand-gated C) intracellular ligand-gated D) stress-gated 41. Which of the following is required for the secretion of neurotransmitters in response to an action potential? A) neurotransmitter receptors B) Nat-K pumps C) voltage-gated K' channels D) voltage-gated Ca2+ channels before entering the 42. The final metabolite produced by glycolysis needs to be converted to citric acid cycle. A) acetyl CoA B) pyruvate C) 3-phosphoglycerate D) glyceraldehyde 3-phosphate 43. Glycolysis generates more stored energy than it expends. What is the net number of activated molecules produced after THREE (3) molecules of glucose pass through this process (number and type of molecules produced minus the number of those molecules used as input)? A) 6 ATP, 3 NADH B) 12 ATP, 12 NADH C) 6 ATP, 6 NADH D) 9 ATP, 9 NADH 44·Which of the following processes in aerobic respiration includes the production of CO2? A) breakdown of glycogen B) glycolysis C) conversion of pyruvate to acetyl CoA D) oxidative phosphorylation 45. Which of the following processes do not take place in the mitochondria? A) conversion of pyruvate to acetyl CoA B) glycolysis C) oxidation of fatty acids to acetyl COA D) oxidative phosphorylation

Explanation / Answer

39.B)Keeping the cytosolic concentration of Ca2+at a low level by pumping Ca2+into ER lumen

40.D)Stress gated

41.D)Voltage-gated Ca2+ channels

42.A)Acetyl CoA

43.C)6 ATP, 6 NADH

44.C)conversion of pyruvate to acetyl CoA

45.B)Glycolysis

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