BIO231B Lecture Notes - Membrane Transport, Membrane Transport Protein, Membrane Protein

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alexis11404

8 Oct 2022

School

Niagara University

Department

BIO

Course

BIO231B

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Document Summary

Ion channels- allow flow of ions in and out of cell. Many are specific to which ions will transport. Carriers- selectively move polar substances across membrane (transport) Uniport - carries one type of solute. Symport - carries two or more simultaneously in same direction. Antiport carries two or more solutes in opposite direction. Cell adhesion molecules help anchor cells together by bonding proteins or filaments together. Cell-identity markers mainly glycoproteins and glycolipids. Recognize other similar cells in tissue formation. Selectively permeable- only some substances can pass across membrane. Passive transport does not require energy. Moves from high concentration to low concentration. Active transport uses energy to get substances across membrane. Endo/exocytosis use of vesicles to transport substances in or out of cell. Transmembrane gradient- concentrations of a solute from one side of a membrane to another. Electrochemical gradient- electrical and chemical gradient (ions) Simple diffusion substances move freely across cell membrane (important for wastes and gas exchange)

Related Questions

Which of the following type(s) of membrane transporter(s) can exist in an open state creating a path for simple diffusion through a cell membrane? (select all that apply)

	A.	Symport Carrier Proteins
	B.	Gated Channel Proteins
	C.	Antiport Carrier Proteins
	D.	Uniport Carrier Proteins

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

olivecod348

Plasma membrane proteins may function as any of the following,except for:

1: cell adhesion molecules

2: Enzymes

3:Ligands

4:Transport Channels

5:Receptors for Chemical Signals

aquamarinegnu196

BIO231B Lecture Notes - Membrane Transport, Membrane Transport Protein, Membrane Protein

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