CELL MEMBRANE

Question 1

Regulate the passage of molecules into
and out of cells and organelles

Answer 1

CELL MEMBRANE

Question 2

Divide the cell into numerous
compartments, each with its own
specialized metabolism,

Answer 2

CELL MEMBRANE

Question 3

Act as surfaces that hold enzymes.

Answer 3

CELL MEMBRANE

Question 4

refers to something that
contains many different parts.

Answer 4

Mosaic

Question 5

The plasma membrane is a
mosaic of

Answer 5

phospholipids,
cholesterol molecules, proteins
and carbohydrates.

Question 6

The plasma membrane is a
mosaic of phospholipids,
cholesterol molecules, proteins
and carbohydrates.

Answer 6

THE FLUID MOSAIC MODEL

Question 7

COMPONENTS OF
MEMBRANE

Answer 7

1. Phospholipids
2. Cholesterol
3. Proteins
4. Carbohydrates

Question 8

Make up the basic structure of a cell membrane.

Answer 8

Phospholipids

Question 9

Head end

Answer 9

contains a phosphate group and is hydrophilic.

Question 10

Tail end

Answer 10

made up of two strings of
hydrogen and carbon atoms

Question 11

made up of two strings of
hydrogen and carbon atoms

Answer 11

fatty acid chains.

Question 12

These chains are hydrophobic

Answer 12

fatty acid chains.

Question 13

heads are always
arranged so that they are near water.

Answer 13

hydrophilic phosphate

Question 14

are organized in a
manner that keeps them away from water.

Answer 14

hydrophobic tails

Question 15

Cholesterol
* Made up of

Answer 15

four rings of hydrogen and carbon Atoms.

Question 16

Are hydrophobic and are found among the
hydrophobic tails in the lipid bilayer.

Answer 16

Cholesterol

Question 17

Important for maintaining the consistency of the
cell membrane.

Answer 17

Cholesterol

Question 18

Strengthen the membrane by preventing some
small molecules from crossing it.

Answer 18

Cholesterol

Question 19

Ensures that the cell membrane stays fluid and
flexible.

Answer 19

Cholesterol

Question 20

Are located in the lipid bilayer and are called

Answer 20

integral proteins.

Question 21

PROTEIN can be found on
either side of the lipid bilayer: inside the cell or outside the cell.

Answer 21

peripheral
proteins,

Question 22

proteins Function as

Answer 22

enzymes to speed up
chemical reactions, act as receptors
for specific molecules, or transport
materials across the cell membrane.

Question 23

They are only found on the extracellular side of a
cell membrane.

Answer 23

Carbohydrates

Question 24

Form the glycocalyx

Answer 24

Carbohydrates

Question 25

Provides cushioning and protection for the
plasma membrane, and it is also important in cell
recognition.

Answer 25

Carbohydrates

Question 26

Act as a glue to attach cells together.

Answer 26

Carbohydrates

Question 27

PROPERTIES OF
MEMBRANE

Answer 27

1. Membrane can grow.
2. Membrane fusion
   allows the transport of
   material.
3. All biological
   membranes are
   selectively permeable
4. Membranes are
   dynamic, constantly
   changing

Question 28

• Membranes are formed molecule by molecule in certain regions of the cell; then entire pieces of membrane are moved as small bubbles or vesicles to different sites in the cell.
• When the vesicle of preformed membrane arrives at the growing membrane, the two fuse.

Answer 28

Membrane can grow

Question 29

exocyto and endocyto

Answer 29

Membrane fusion allows the
transport of material

Question 30

is basically the opposite
process: A small invagination forms in
the outer membrane then pinches
shut, creating a new vesicle that
contains extracellular material.

Answer 30

Endocytosis

Question 31

is a means to excrete
almost anything: wastes, debris,
mucilage, proteins, and
polysaccharides.

Answer 31

Exocytosis

Question 32

also called differentially
permeable
* meaning that certain
substances cross membrane
more easily and rapidly than
others.

Answer 32

All biological membranes are
selectively permeable

Question 33

Instead, new components are
constantly being inserted and old
ones removed.

Answer 33

They are dynamic, constantly
changing.