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Bio-181 > Chapter 7 > Flashcards

Chapter 7 Flashcards

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Biology 101 flashcards
1
Q

A phospholipid is

A

Amphipathic

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2
Q

What other membrane is amphipathic?

A

Membrane proteins

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3
Q

What is the fluid mosaic model?

A

When the membrane is a mosaic of protein molecules in a fluid bilayer of phospholipids

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4
Q

What do Integral Proteins do?

A

Penetrates the hydrophobic interior

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5
Q

What do Peripheral Proteins do?

A

They loosely bound to the surface of the membrane

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6
Q

What is selective permeability?

A

When it allows some substances to pass easier than others

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7
Q

What other way can ions penetrate the hydrophobic interior?

A

By the Transport Proteins

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8
Q

Cells that are associated with Transport Proteins are called :

A

Aquaporins

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9
Q

What is diffusion?

A

When particles spread out into available space

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10
Q

What is concentration gradient?

A

When a substance diffuses from more concentrated to less concentrated

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11
Q

What is passive transport?

A

The diffusion of a substance across a biological membrane

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12
Q

What is osmoregulation?

A

The control of solute concentrations and water balance

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13
Q

What is facilitated diffusion?

A

Diffusion but with the help of transport proteins

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14
Q

What is active transport?

A

When a solute is pumped across a membrane and the cell must expand

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15
Q

What is membrane potential?

A

The voltage across a membrane

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16
Q

What is associated with Membrane Potential?

A

Electrogenic Pumps

17
Q

What do electrogenic pumps do?

A

They transport proteins that generates voltage

18
Q

What is Exocytosis?

A

When the cell secretes certain molecules by the fusion of vesicles with the plasma membrane

19
Q

What is endocytosis?

A

When the cell takes in molecules and form new vesicles from the plasma membrane

20
Q

What function do carbohydrates fulfill in the plasma membrane?

A

Cell-to-Cell recognition

21
Q

Why is energy required for active transport?

A

Because it moves solutes against their concentration gradient

22
Q

How does cholesterol affect membrane fluidity?

A

At body temp. it makes the membrane less fluid

23
Q

What is Plasmolysis?

A

When a plant cell shrinks

Bio-181 (15 decks)

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