41. Channel proteins facilitate the transport of molecules by active transport 4

Question

41. Channel proteins facilitate the transport of molecules by active transport 42. Channels allow the appropriate ions or small molecules to pass hrough. 43. All of the following are transmembrane pumps that facilitate active transport except? (a) True (a) True (a) ATP-driven pumps (b) False (b) False (c) Light-driven pump (b) Channel pumps 44. Neurotransmitters are secreted into a specialized junction known as the (d) Coupled pumps (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 >ChemicalChemical (c) ChemicalElectrical Chemical (d) ElectricalChemicalElectrical 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 membrane. (a) True (b) False 49. Transmembrane proteins allow large particles to pass through the membrane. (a) True (b) False 50. Prokaryotes adapt to hot temperatures by increasing the length of their hydrophobic tails and decreasing the amount of double bonds in their phospholipid bilayer (a) True (b) False

Explanation / Answer

Answer no.41

False

It is because channel proteins only transport substances through membranes passively.

Answer no.42

True

Channel protein transport water or a specific type of ions down their concentration or electrical potential gradient, an energetically favorable reaction.

Answer no.43

b)channel pumps

They facilitate passive transport.

Answer no.44

a) synapse

Neurotransmitters are synthesized by neurons and are stored in vesicles, which typically are located in the axon's terminal end,known as the presynaptic terminal. The presynaptic terminal is separated from the neuron or muscle or gland cell onto which it impinges by a gap called as synaptic cleft. The synaptic cleft, presynaptic terminal, and receiving dendrite of the next cell together form a junction known as a synapse.

Answer no.45

b)electrical-chemical-chemical

Two types of phenomenon are involved in processing the nerve impulse: electrical and chemical

Electrical events propagate a signal within a neuron and chemical processes transmit the signal from one neuron to another. The chemical process of interaction between neurons and between neurons and effector cells occur at the end of the axon, in a structure called synapse. Touching very close against the dendrite of other cells, the axon releases chemical substances called neurotransmitters, which attach themselves to the chemical receptor in the membrane of the following neuron and promote excitatory or inhibitory changes in its membrane.

Answer no.48

TRUE

Spectrin is a large cytoskeletal protein.It is crucial for maintaining the stability and structure of the cell membrane and the shape of a cell.

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