Use this space if you would like to draw or visualise the cell and its
environment to help you answer #21. This space is NOT graded.
Use this diagramme to answer #22.
Question 22
22.
Question 23
23.
Draw a single phospholipid molecule and label the following: (1) head, (2) tail,
(3) hydrophobic end, and (4) hydrophilic ends.
Question 24
24.
Label the cell membrane below using the following terms: (1) phospholipid, (2)
transport protein, (3) cholesterol,
(4) hydrophobic region, (5) hydrophilic region, (6) head, (7) tail,
(8) polar, (9) non-polar
Be VERY specific - circle items if necessary to make it very clear what you are
labeling!
Question 25
25.
Draw and label TWO water molecules showing the partial charges, bonds (hydrogen
and covalent), and label the atoms/elements.
Because the phospholipid molecules are free to move and the membrane is made of
many different parts, the plasma membrane is said to be:
Impermeable
A fluid mosaic
Solid
A fatty acid
Which of the following is a function of the cell membrane?
Breaks down lipids, carbohydrates, and proteins from foods.
Stores water, salt, proteins, and carbohydrates.
Keeps the cell wall in place.
Regulates what materials enter and leave the cell.
In the diagramme above, structure B represents:
Protein
Cholesterol
Phospholipid
Carbohydrate
What cell membrane structure is NOT shown in the illustration above?
Protein
Cholesterol
Phospholipid
They are all present.
Diffusion is the movement of molecules from:
An area of low concentration to an area of high concentration.
An area of high concentration to an area of low concentration.
An area of equilibrium to an area of high concentration.
All of the above.
The movement of water across a selectively permeable membrane is called:
Endocytosis
Facilitated diffusion
Osmosis
Active transport
In the diagramme above, which of the following represents a cell in equilibrium
with the surrounding solution?
A
B
C
D
What process requires energy for particles to pass through the cell membrane?
Diffusion
Facilitated diffusion
Osmosis
Active transport
One of the functions of proteins in a cell membrane could be:
To allow larger molecules to pass through the cell membrane.
To make sugar for the cell.
To provide nutrients to phospholipids.
To transform light into usable energy.
The unique properties of water enable life to exist on Earth. Which of these is
a property of pure water?
Its solid form is more dense than its liquid.
It is non-polar.
It has a low heat absorption capacity.
It dissolves many substances
Most of the molecules in cell membranes are:
Proteins
Cholesterol
Water
Phospholipids
The leaves at the tops of trees receive water because of:
Capillary action
Specific heat
Density
Surface tension
Due to the uneven distribution (spread) of charges, water is considered to be:
An ion
Polar
Negative at both ends
Neutral
Water strider beetles can walk on water due to:
Capillary action
Specific heat
Surface tension
Universal solvent
Fish can survive after a pond has frozen in the winter because of which property
of water?
Resists temperature change / specific heat
Cohesion
Homeostasis
Ice floats
The phospholipid bilayer describes a structure with:
Polar heads on the outside and non-polar tails on the inside.
Non-polar tails on the outside and polar heads on the inside.
Polar layers on both the inside and outside.
Non-polar layers on both the inside and outside.
If all materials were allowed to cross the cell membrane, then a cell’s contents
would be the same as its surroundings. This does NOT happen because the cell
membrane is:
Permeable
A fluid mosaic
Selectively permeable
In dynamic equilibrium
Water may dissolve many compounds because of its:
Ionic bonding
pH
Polarity
Covalent bonding
The molecule shown in the illustration above is passing through the transport
protein from an area of high concentration to an area of low concentration. This
process is called:
Active transport
Facilitated diffusion
Endocytosis
Osmosis
The unicellular organism pictured above is taking IN a large food particles by
which process?
Facilitated diffusion
Exocytosis
Lysocytosis
Endocytosis
If hypotonic cells are placed in a highly concentrated sugar solution, water
will:You may use the whiteboard space below this question to draw it out.
Move from the sugar solution to the cells.
Move from the cells to the sugar solution.
Stay in the cell.
Evaporate.
Which conditions shown in the illustration above might cause a cell to burst?
