BSCI 105 Lecture Notes - Lecture 7: Peripheral Membrane Protein, Lipid Raft, Lipid Bilayer

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orangereindeer556

13 Aug 2016

School

University of Maryland

Department

Biological Sciences Program

Course

BSCI 105

Professor

Dr.Keller

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Document Summary

The cell as the fundamental unit of life. Structural elements: phospholipid bilayer, membrane proteins, interior/exterior protein networks. Phospholipids are freely moving: lateral movement (often, flip-flop (very rare) Proteins may freely move: anchored - no movement, non-anchored movement. Inner vs. outer layers ( leafs : different phospholipids, glycolipids. Transmembrane proteins: single and multi pass. Net movement from a region of high concentration to a region of low concentration. Properties of membrane can have an impact on movement: permeable, impermeable. A special case of diffusion: net water (solvent) movement across a membrane, toward a higher solute concentration. Relative solute concentration: hypertonic (higher, hypotonic (lower, isotonic (similar) Plant cells: most plants are hyperosmotic to their immediate environment, turgor pressure. Hydrostatic pressure pushed membrane against cell wall. Movement of water across lipid bilayer happens, but slowly. Diffusion using transport proteins: channel proteins, carrier proteins.

Related Questions

Hybridomas are the useful result of a fusion between _______________ and _________________ to obtain hybrid cells that can proliferate and produce _________________ against specific ________________.

	myeloma cells; B lymphocytes; monoclonal antibodies; epitopes
	myeloma cells; T lymphocytes; polyclonal antibodies; antigen
	T lymphocytes; B lymphocytes; monoclonal antibodies; antigen
	T lymphocytes; B lymphocytes; polyclonal antibodies; epitopes

With respect to mammalian cell culture, which of the following statements is true?

	Media used for cell growth contain proteases and a divalent cation chelator to help cells adhere to the surface.
	During the establishment of a cell line, senescence is the last stage of the cell's life.
	Rodent cells cultures undergo spontaneous transformation with similar frequency to human cell cultures.
	Embryonic cell lines do not undergo senescence nor do they have a finite life span.

Epithelial cells have distinct surfaces. Which of these surfaces tends to be involved in secreting proteins out of the cell and into the bloodstream?

	apical
	basal
	All of the answers are correct.
	lateral

Which of the following is NOT true of phospholipid bilayers?

		Phospholipid bilayers separate the cell from the exterior environment as well as from compartments within the cell.
		The interior of phospholipid bilayers is a highly hydrophobic environment.
		Membrane budding requires transient breakages in the bilayer membrane.
		The chemical properties of phospholipids lead to the spontaneous formation of bilayers.

Which of the following is true regarding membrane proteins?

		All peripheral membrane proteins contact the lipid bilayer by covalent attachment to the hydrophilic head groups on membrane lipids.
		Beta strands can assemble into a membrane-spanning barrel structure.
		Lipid-anchored membrane proteins always face the cell exterior.
		A protein with six hydrophobic helices is most likely a lipid-anchored membrane protein.

Which of the following statements is NOT true?

		The three types of lipid anchors responsible for tethering proteins to the bilayer are acylation, prenylation, and ubiquitinylation.
		Movement of lipids from the cytoplasmic to the exoplasmic leaflet of the membrane bilayer requires specialized transport proteins called flippases.
		Glycoproteins are the basis for blood type compatibility between donor and receiver.
		Glycoproteins are always oriented so that the carbohydrate moieties are exoplasmic.

BSCI 105 Lecture Notes - Lecture 7: Peripheral Membrane Protein, Lipid Raft, Lipid Bilayer

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