LESSON 8 Flashcards

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1
Q

a membrane made of two layers of phospholipids with embedded proteins that separates the insides of the cell from its environment

A

cell membrane

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2
Q

This is a group of organic compounds that are insoluble in water.

A

lipids

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3
Q

Examples include fats, waxes, oils, and hormones.

A

lipids

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4
Q

hydrophilic head

A

phosphate group

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5
Q

hydrophobic tail

A

fatty acids

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6
Q

having both hydrophilic and hydrophobic parts.

A

amphipathic molecule

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7
Q

allows certain substances to pass through but not others.

A

semi- permeable

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8
Q

hese molecules are madeup of building blocks called amino acids joined by peptide bonds.

A

proteins

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9
Q

_______ penetrate the hydrophobic core

A

Integral proteins

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10
Q

Integral proteins that span the membrane are called __________

A

transmembrane proteins

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11
Q

The hydrophobic regions of an integral protein consist of one or more stretches of ____________, often coiled into ___________

A

nonpolar amino acids; alpha helices

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12
Q

___________ - spans across the membrane

A

polytropic or transmembrane

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13
Q

_________ attached to only one side of the membrane

A

monoprotic

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14
Q

are bound to the surface of the membrane

A

Peripheral proteins

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15
Q

Functions of Proteins

A

receptor
channel
transmembrane transport
adhesion
cell-cell recognition
enzymatic function

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16
Q

________ are a special class of proteins that function by binding a specific ligand molecule.

A

Receptors

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17
Q

When a ligand binds to its ______, the ______ can change conformation, transmitting a signal into the cell.

A

receptor

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18
Q

common ligands are the

A

neutral molecules water (H2O), ammonia (NH3), and carbon monoxide (CO) and the anions cyanide (CN-), chloride (Cl-), and hydroxide (OH-).

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19
Q

A __________ is a special arrangement of amino acids which embeds in the cell membrane, providing a hydrophilic passageway for water and small, polar ions.

A

channel protein

20
Q

Like all transport proteins, each _________ has a size and shape which excludes all but the most specific molecules.

A

channel protein

21
Q

A ___________ is seen, embedded within the membrane. Ions, the small green hexagons, travel through the channel protein.

A

generic channel protein

22
Q

A _____________ is a membrane protein involved in the movement of ions, small molecules, and macromolecules, such as another protein, across a biological membrane.

A

membrane transport protein (or simply transporter)

23
Q

Only ________ proteins can function on both sides of the bilayer or transport molecules across it

A

transmembrane

24
Q

__________ are transmembrane proteins that bind signal molecules in the extracellular space and generate different intracellular signals on the opposite side of the plasma membrane.

A

Cell-surface receptors

25
Q

This particular function is useful in the immune system, as it helps the body to recognize foreign cells that may be causing infection, for instance.

A

cell recognition of proteins

26
Q

this means that they are able to carry out chemical reactions.

A

enzymatic activity;

27
Q

This can be to induce signal transduction of signals into the cell, such as catalyzing phosphorylation of another protein.

A

enzymatic activity

28
Q

It is a biomolecule made up of carbon, hydrogen, and oxygen.

A

carbohydrates

29
Q

Sugar, starches and fiber are some of its examples.
mostly found on the external surface

A

carbohydrates

30
Q

Attached to proteins

A

glycoproteins

31
Q

attached to lipids

A

glycolipids

32
Q

Forms distinctive cellular markers

A

carbohydrate

33
Q

cell-cell recognition
Cell pathogen recognition

A

carbohydrate

34
Q

It is a type of lipid, a waxy substance found in cells.

A

cholesterol

35
Q

It is essential in the production of other biomolecules like hormones, steroids and vitamin D.

A

cholesterol

36
Q

regulates the fluidity of the membrane as temperature varies

A

cholesterol

37
Q

*high temperature → _____ fluidity

A

decrease

38
Q

low temperature → _____ fluidity

A

increase

39
Q

fluid mosaic model by

A

Singer and Nicolson 1972

40
Q

FUNCTIONS OF CELL MEMBRANE

A

Protection
Material Transport
Cell Shape
Compartmentalization
Cell Recognition
Cell Function

41
Q

It serves as a barrier that separates the components of the cell from its surrounding environment.

A

Protection

42
Q

It is a semi-permeable membrane that regulates the transport of materials in and out of the cell.

A

Material Transport

43
Q

It serves as the attachment point of the cytoskeleton which aids in maintaining the shape and form of a cell.

A

Cell Shape

44
Q

It separates the organelles from each other and from the cytoplasm providing their own environment and functional individuality

A

Compartmentalization

45
Q

It enable cells to identify other cells and foreign substances.

A

Cell Recognition

46
Q

It plays a vital role in the performance of the cell’s function i.e. locomotion, absorption,impulse transmission

A

Cell Function

47
Q
A