HUMB1000 Lecture Notes - Lecture 5: Membrane Transport Protein, Cell Membrane, Osmotic Concentration

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7 Aug 2018

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Aquaporins: proteins that allow the transport of water through the cell membrane. Antiport: movement of two different molecules in opposite directions across a plasma membrane, via a carrier protein. Symport: movement of two different molecules in the same direction across a plasma membrane, via a carrier protein. Many molecules of acetyl coa can be produced from triglycerides. Phospholipids are constantly floating and can change shape and composition. Net equation: 1 glucose + 6o2 36atp + 6co2 + 6h2o. Attaches cells to other cells (cell-cell adhesion) or cells to the surrounding matrix (cell-matrix adhesion) Cells communicate with the outer environment via proteins in the cell membrane. Is selectively permeable - allows diff. specialised intra and extracellular environment (e. g. diff. charge for nerves) Fluid mosaic model - constantly changing, can change shape and composition. Gated ion channels are opened or closed by stimuli, e. g. sodium channels in nerve cells. Move ions from one side of the membrane to the others.

Related Questions

3. In an aqueous environment, the phospholipids of a membrane____.

a) are arranged in a single layer

b) are arranged in a bilayer with the polar heads of each layerlocated at the surface

c) are arranged in a bilayer with the fatty acid tails locatedat the surface

d) are arranged in a bilayer but the phospholipids have nospecific orientation

e) dissolve

4. which of the following molecules demonstrate dual solubilitycharacteristics

a) sterols only

b) proteins only

c) phospholipids only

d) sterols and phospholipids

e) sterols, phospholipids, and proteins

5. The "mosaic" part of the fluid mosaic model refers to themembrane ____.

a) proteins

b) phospholipids

c) cholesterol

d) functions

e) layers

9. Transport of a molecule across a cell membrane by facilitateddiffusion ____.

a) does not exhibit specificity for a particular type ofmolecule

b) requires the input of energy

c) depends on a concentration gradient

d) goes against the concentration gradient

e) allows non-polar uncharged molecules to diffuse across amembrane

13. A transport system in which transport of an ion in onedirection provides the energy for active transport in the oppositedirection is known as ____.

a) primary active transport

b) active diffusion

c) secondary active transport

d) cotransport

e) osmosis

14. Cells undergo exocytosis ____.

a) to pump protons down a concentration gradient

b) when replicating

c) to secrete protein and wastes from the cell

d) to ingest nutrients

e) as a means of cellular protection

15. What is the molecular basis of familialhypercholestremia?

a) HDL enters cells using a specific receptor on the cellsurface

b) LDL enters cells using a specific receptor on the cellsurface

c) HDL exits cells using a specific receptor on the cellsurface

d) LDL exits cells using a specific receptor on the cellsurface

e) receptor-mediated exocytosis

16. Carrier molecules are utilized for ____.

a) active transport only

b) passive transport only

c) both active and passive transport

d) osmosis

e) transport of all types of molecules

17. All of the following are functions of integral membraneproteins EXCEPT ____.

a) transport of polar molecules

b) reception of chemical signals form other cells

c) cell division

d) recognition of other cells as being "like"

e) cell-cell binding

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HUMB1000 Lecture Notes - Lecture 5: Membrane Transport Protein, Cell Membrane, Osmotic Concentration

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