Structure Of Cell Membranes Flashcards

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1
Q

Roles of cell membranes at the surface of cells

A

Separates cells contents, regulates transport of materials in and out, contains enzymes involved in specific metabolic pathways, releases chemicals to signal other cells,

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2
Q

Roles of cell membranes within cells

A

Mitochondria have folded inner membrane to increase SA, inner membrane of chloroplasts contains chlorophyll, digestive enzymes catalyse reactions

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3
Q

Explain fluid mosaic model

A

Singer and Nicholson 1972

Mosaic- bilayer with proteins floating in it

Fluid - lipid molecules change places and some proteins move

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4
Q

Membrane in neurones

A

Protein channels and carriers allow entry and exit of ions

Myelin sheath gives several layers of membrane

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5
Q

Membrane in white blood cells

A

Special protein receptors recognise antigens of foreign cells

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6
Q

Membrane in root hair cell

A

Many carrier proteins to actively transport nitrate ions

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7
Q

Membranes in mitochondria

A

Folded inner membrane gives large SA

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8
Q

Phospholipid bilateral contains

A

Phospholipids (hydrophilic head, phobic tail)
Cytoskeletal filaments
Cholesterol - strength and flexibility
Channel and carrier proteins
Glycolipid - carb chain attached to lipid
Glycocalyx - v hydrophilic
Glycoproteins - carb chain attached to protein

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