41. Channel proteins facilitate the transport of molecules by active transpont.

Question

41. Channel proteins facilitate the transport of molecules by active transpont. 42. Channels allow the appropriate ions or small molecules to pass through 43. All of the following are transmembrane pumps that facilitate active transport except? (a) True (b) False (b) False (c) Light-driven pump (a) True (a) ATP-driven pumps (b) Channel pumps (d) Coupled pumps 44 Neurotransmitters are secreted into a specialized junction known as the (a) Synapse (b) Synaptic vesicles (c) Ligand channel (d) Axon 45. How does nerve impulses travel from one neuron to another? (a) Chemical ? Chemical ? Electrical (b) Electrical Chemical Chemical (c) Chemical Electrical Chemical (d) Electrical- Chemical>Electrical 46. Neuron is stimulated, the membrane potential of the plasma membrane shifts to a less negative value by opening voltage-gated K' channels: (a) True (b) False 47. Once a neuron is stimulated and the membrane potential is depolarized, the depolarized axonal membrane is helped to return to its resting potential by opening voltage-gated K+ channels, allowing K+ to flow out of the cell down its concentration gradient (a) True (b) False 48. Spectrin is a protein found in the plasma membrane of all eukaryotic cells that provide support to the plasma 49. Transmembrane proteins allow large particles to pass through the membrane. 50 Prokaryotes adapt to hot temperatures by increasing the length of their hydrophobic tails and decreasing the membrane. (b) False (a) True (a) True amount of double bonds in their phospholipid bilayer (b) False (a) True (b) False

Explanation / Answer

41. false

channel protein facilitate the transport of molecules by passive transport. it is an energy independent process , always occurs along the concentration gradient.

42. true

yes channel allow the apprpriate ions or small molecules to pass through.because they form open pores through membrane which allows the free diffusion of any molecule but molecule should be of appropriate size and charge.

43. b- channel pumps. because channels always facilitate passive transport.

44. a-- synapse. this is where action potential triggers presynaptic neuron to release of neurotrasmitters.

45.d-- electrical -- chemical-- electrical

converts electrical signal into chemical signal in the form of neurotransmitters release then after binding of the neurotransmitters to post synaptic receptor, signal again back into electrical form.

46. false.

less negative value is only achieved by opening of voltage gated Na+ channels.

47. true.

K+ channels even after achieving resting membrane potential remains open to develop hyperpolarization

48. true

spectrin present intracellular side of the plasma membrane. plays structural role to maintain the shape.

49. true

50. true

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