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Biology > Chapter 1 - Cell Ultrastructure & Movements > Flashcards

Chapter 1 - Cell Ultrastructure & Movements Flashcards

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0
Q

What type of process is diffusion?

A

Passive

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1
Q

What is diffusion?

A

Movement of molecules from a high concentration to a low concentration until an equal concentration is achieved

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2
Q

Does diffusion show substances moving up or down a concentration gradient?

A

Down as it requires no energy

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3
Q

What is osmosis?

A

Movement of water molecules from a HWC to a LWC through a selectively permeable membrane

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4
Q

What type of movement is osmosis?

A

Passive

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5
Q

Is osmosis up or down a concentration gradient?

A

Down, as it requires no energy

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6
Q

What is active transport?

A

Movement of molecules from a HC to a LC

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7
Q

Does active transport require energy?

A

Yes it is an active process

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8
Q

Active transport - signifies a movement of up or down a concentration gradient?

A

Up, as it requires energy

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9
Q

How are the ions in active transport pumped across the membrane?

A

Protein carriers

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10
Q

Associate active transport with a cellular process

A

ALWAYS respiration

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11
Q

Hypotonic

A

More water

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12
Q

Hypertonic

A

Less water

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13
Q

Isotonic

A

Equal water

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14
Q

What is endocytosis?

A

Cell engulfs large molecules - ENTERS

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15
Q

Example of endocytosis

A

Phagocytosis

16
Q

What is exocytosis?

A

Secretion of large molecules by membrane movements - EXITS

17
Q

What is the cell membrane?

A

Outer boundary in animal cells - inner boundary in plant cells

18
Q

What structure is the cell membrane?

A

Phospholipid bilayer - patchy arrangement of proteins making it have a fluid mosaic structure

19
Q

The plasma membrane is …… permeable

A

Selectively

20
Q

Give 4 examples of the uses of proteins in the cell membrane

A 
Receptor for hormones
Enzyme
Protein carrier
Supporting protein 
Channel-forming protein 
Anti-genic marker
21
Q

What is the cell wall?

A

Outer boundary in plant cells

22
Q

What is the cell wall made from?

A

Cellulose fibres and pectin

23
Q

The cell wall gives the cell…

A

Structure, strength and slight elasticity

24
Q

The cell wall prevents…

A

The cell from bursting

25
Q

The cell wall is ….. permeable

A

Freely

Biology (14 decks)

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