Biology

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65 Questions - Developed by: V - Developed on: - 296 taken

  • 1
    - Diffusion through membrane channels is a continuous uninterrupted process
     True
     False
  • 2
    - Diffusion through membrane channels can be interrupted (reduced) by closing the channels
     True
     False
  • 3
    - Diffusion through membrane channels does not depend on the type of diffusing molecules
     True
     False
  • 4
    - Diffusion through membrane channels does not depend on the type of these channels
     True
     False
  • 5
    - Diffusion through membrane channels depends on the type of diffusing molecules
     True
     False
  • 6
    - Diffusion through membrane channels depends on the type of these channels
     True
     False
  • 7
    - Membrane transport is performed e.g. by diffusion
     True
     False
  • 8
    - Membrane transport is performed e.g. by facilitated diffusion
     True
     False
  • 9
    - Carriers within the membrane facilitate the membrane transport for given substance
    (molecules)
     True
     False
  • 10
    - Carriers within the membrane reduce the membrane transport for given substance
    (molecules)
     True
     False
  • 11
    - Diffusion through membrane channels allows the penetration of ions, e.g. Na+, K+, Ca2+, Cl across the membrane
     True
     False
  • 12
    - Diffusion through membrane channels allows the penetration of macromolecules (e.g. proteins) across the membrane
     True
     False
  • 13
    - Facilitated diffusion allows the transport of e.g. amino acid and protein molecules across the membrane
     True
     False
  • 14
    - Diffusion through membrane channels is an active transport mechanism through cell
    membranes
     True
     False
  • 15
    - Diffusion through the membrane channels is a passive transport mechanism through
    cell membranes
     True
     False
  • 16
    - Diffusion occurs because thermal (heat) movement of molecules
     True
     False
  • 17
    - Diffusion is a spontaneous transport of the substance from the area of its lower
    concentration to the area with its higher concentration
     True
     False
  • 18
    - Diffusion is a spontaneous transport of the substance from the area of its higher
    concentration to the area with its lower concentration
     True
     False
  • 19
    - Diffusion of the substance dissolved in the water depends on the membrane
    permeability to water molecules
     True
     False
  • 20
    - Diffusion does not depend on the temperature
     True
     False
  • 21
    - Diffusion depends on the temperature
     True
     False
  • 22
    - An amount of diffused substance is proportional to the duration of diffusion
     True
     False
  • 23
    - An amount of diffused substance is not proportional to the duration of diffusion
     True
     False
  • 24
    - An amount of diffused substance is proportional to the square of the surface area
    through which the substance diffuses
     True
     False
  • 25
    - An amount of diffused substance is proportional to the surface area through which the
    substance diffuses
     True
     False
  • 26
    - An amount of diffused substance is inversely proportional to the concentration gradient
     True
     False
  • 27
    - An amount of diffused substance is proportional to the concentration gradient
     True
     False
  • 28
    - An amount of diffused substance is proportional to the distance which the substance must pass
     True
     False
  • 29
    - Osmosis is reverse process to the diffusion (the penetration and movement of the
    substance reversely than during the diffusion)
     True
     False
  • 30
    - Osmosis requires some carriers for transport of substances being dissolved
     True
     False
  • 31
    - Osmosis is the diffusion being acting through the membrane
     True
     False
  • 32
    - Osmosis is an active transport of water molecules only
     True
     False
  • 33
    - Channels within the membrane control permeability of the membrane via opening and
    closing them according to the membrane potential or the receptor activity
     True
     False
  • 34
    - Osmosis is an active transport through cell membranes
     True
     False
  • 35
    - Osmosis occurs because thermal (heat) movement of molecules
     True
     False
  • 36
    - The diffusion constant (coefficient) depends on both the composition and structure of
    the membrane and on the sort of diffused substance (e.g. gas)
     True
     False
  • 37
    - The diffusion constant (coefficient) depends on the sort of diffused substance, but not
    on the composition and structure of the membrane
     True
     False
  • 38
    - Membrane transports never work against concentration gradients
     True
     False
  • 39
    - Membrane channels are classified as „voltage“ or „ligand“ gated
     True
     False
  • 40
    - Osmotic pressure depends on the mass of solution
     True
     False
  • 41
    - Osmotic pressure depends on the number of liquid molecules
     True
     False
  • 42
    - Osmotic pressure depends on the volume of solution
     True
     False
  • 43
    - Osmotic pressure depends on the number of dissolved molecules
     True
     False
  • 44
    - The glucose symport employs the concentration gradient of sodium ions in order to
    transport glucose molecules into the cell against the glucose concentration gradient
     True
     False
  • 45
    - The glucose symport employs the concentration gradient of potassium ions in order to
    transport glucose molecules into the cell against the glucose concentration gradient
     True
     False
  • 46
    - Co-transports are active mechanisms of transport of molecules through the membrane
    utilizing the energy from ATP molecules
     True
     False
  • 47
    - Hydrolysis of ATP usually accompanies active transports
     True
     False
  • 48
    - Exocytosis is an active transport mechanism
     True
     False
  • 49
    - Exocytosis is a passive transport mechanism
     True
     False
  • 50
    - At synapses, release of mediator molecules is performed by exocytosis
     True
     False
  • 51
    - Typical cell membrane contains either channels for Na+ or for K+
     True
     False
  • 52
    - Typical cell membrane contains channels for both Na+ and K+
     True
     False
  • 53
    - Na+-K+ ATP-ase is the enzyme placed within intracellular membranes
     True
     False
  • 54
    - Na+-K+ ATP-ase is the enzyme placed within (at) cellular membranes
     True
     False
  • 55
    - Na+-K+ ATP-ase performs active transport of Na+ out of the cell and K+ into the cell
     True
     False
  • 56
    - Na+-K+ ATP-ase performs active transport of K+ out of the cell and Na+ into the cell
     True
     False
  • 57
    - The Natrium-Potassium pump requires ADP molecules to operate (to work)
     True
     False
  • 58
    - The Natrium-Potassium pump requires action potential for its activation
     True
     False
  • 59
    - The Natrium-Potassium pump requires ATP molecules to operate (to work)
     True
     False
  • 60
    - The Natrium-Potassium pump does not require action potential for its activation
     True
     False
  • 61
    - Filtration is a passive transport through membranes following the electrochemical gradient
     True
     False
  • 62
    - Filtration is a passive transport of ions through cell membranes following the gradient of concentration
     True
     False
  • 63
    - Filtration is an active transport through membranes following the electrochemical gradient
     True
     False
  • 64
    - Filtration is an active transport of ions through cell membranes following the gradient of concentration
     True
     False
  • 65
    - Passive and active transports (through the membrane) require a delivery of free energy from the molecules of ATP
     True
     False

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