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Test

Cell Membranes

Barb S 19 preguntas

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Preguntas del test (19)

  1. 1Roles of Membranes:

    Separates cell [blank_start]components[blank_end] from its [blank_start]external[blank_end] environment
    Regulates [blank_start]transport[blank_end] in / out of cells
    Contains [blank_start]enzymes[blank_end] and [blank_start]antigens[blank_end]
    Releases [blank_start]chemicals[blank_end] in [blank_start]cell signalling[blank_end]
    Contain [blank_start]receptors[blank_end] for cell signalling
    Site of [blank_start]metabolic[blank_end] pathways
    1. Aexternal
    2. Bcomponents
    3. Ctransport
    4. Denzymes
    5. Eantigens
    6. Fchemicals
    7. Gcell signalling
    8. Hreceptors
    9. Imetabolic
  2. 2Functions of Phospholipids:

    [blank_start]Partially[blank_end] permeable membrane
    Allow small, [blank_start]lipid-based[blank_end] molecules to enter/leave
    Prevents [blank_start]polar[blank_end] (water soluble) molecules entering/leaving
    Unsaturated fatty acid chains have [blank_start]kinks[blank_end] which increase [blank_start]fluidity[blank_end]
    1. APartially
    2. Blipid-based
    3. Cpolar
    4. Dkinks
    5. Efluidity
  3. 3Functions of Cholesterol:

    [blank_start]Stabilises[blank_end] cell membrane ([blank_start]mechanical[blank_end] stability)
    Regulates [blank_start]fluidity[blank_end]
    Reduces [blank_start]lateral[blank_end] movement of phospholipids
    Helps prevent [blank_start]water[blank_end]/ions passing through

    1. AStabilises
    2. Bmechanical
    3. Cfluidity
    4. Dlateral
    5. Ewater
  4. 4Functions of membrane proteins:

    Can be [blank_start]intrisnic[blank_end] or [blank_start]extrinsic[blank_end]
    [blank_start]Structural[blank_end] support
    [blank_start]Channel[blank_end] Proteins
    [blank_start]Carrier[blank_end] proteins
    E[blank_start]nzymes[blank_end]
    Glycoproteins and [blank_start]glycolipids[blank_end] (form [blank_start]glycocalyx[blank_end])
    - A[blank_start]ntigens[blank_end]
    - Cell [blank_start]signalling[blank_end]
    - Helps cell attach to one another ( [blank_start]adhesion[blank_end])
    - Attach to [blank_start]watch[blank_end] to stabilise membrane
    1. Aintrisnic
    2. Bextrinsic
    3. CStructural
    4. DChannel
    5. ECarrier
    6. Fnzymes
    7. Gglycocalyx
    8. Hglycolipids
    9. Intigens
    10. Jsignalling
    11. Kadhesion
    12. Lwater
  5. 5Cell Signalling

    [blank_start]Receptors[blank_end] are on surface of plasma membrane:
    - [blank_start]Specific[blank_end] shape
    - [blank_start]Complementary[blank_end] to the hormone shape
    - E.g hormone attaches to [blank_start]receptor[blank_end] - Process uses g[blank_start]lycocalyx[blank_end]
    1. AReceptors
    2. BSpecific
    3. CComplementary
    4. Dreceptor
    5. Elycocalyx
  6. 6Passive Transport

    - No [blank_start]ATP[blank_end] required
    - Relies on k[blank_start]inetic[blank_end] e[blank_start]nergy[blank_end] of molecules
    - moves [blank_start]down[blank_end] concentration gradient
    1. AATP
    2. Binetic
    3. Cnergy
    4. Ddown
  7. 7What is Diffusion?

    The [blank_start]net[blank_end] movement of particles [blank_start]down[blank_end] a concentration gradient from a region of [blank_start]high[blank_end] concentration to [blank_start]low[blank_end] concentration
    1. Anet
    2. Bdown
    3. Chigh
    4. Dlow
  8. 8Simple diffusion in membranes:

    small ([blank_start]H2O[blank_end])
    non-[blank_start]polar[blank_end] (O2, CO2)
    [blank_start]Lipid[blank_end] soluble (steroid hormones)
    1. ALipid
    2. BH2O
    3. Cpolar
  9. 9Facilitated Diffusion in membranes:

    [blank_start]Channel[blank_end] proteins - small, [blank_start]polar[blank_end] molecules ( e.g. [blank_start]water[blank_end] )
    - ions ( e.g. Na+, Cl- )
    [blank_start]Carrier[blank_end] proteins - [blank_start]Large[blank_end] molecules ( e.g. [blank_start]glucose[blank_end])
    - ions
    1. AChannel
    2. BCarrier
    3. Cpolar
    4. Dglucose
    5. Ewater
    6. FLarge
  10. 10Examples of Active Transport:

    uptake of [blank_start]glucose[blank_end] and [blank_start]amino[blank_end] acids in small intestine
    absorption of [blank_start]mineral[blank_end] ions in plant [blank_start]roots[blank_end]
    excretion of h[blank_start]ydrogen[blank_end] ions and u[blank_start]rea[blank_end] by kidneys
    1. Aglucose
    2. Bamino
    3. Cmineral
    4. Droots
    5. Erea
    6. Fydrogen

Información

Descripción
AS level (Cell Membranes) Biology Test sobre Cell Membranes, creado por Barb S el 28/03/2017.
Autor
Barb S
Idioma
English
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