Week One Medical Physiology: Plasma Membranes

Question 1 of 30

1

Name the membrane transport processes

Drag an answer into the correct orange point.

Membrane Transport

Active Processes

Passive Processes

Simple Diffusion

Facilitated Diffusion

Lipid Bilayer

Protein Channels

Active Transport

Bulk Transport

Exocytosis

Endocytosis

Phagocytosis

Pinocytosis

Receptor mediated endocytosis

Explanation

Question 2 of 30

1

Fill the blank spaces to complete the text.

The basic principles of passive membrane transport processes are that:
There is no expenditure of
The substances move their concentration gradient: moving from area of concentration to concentration
Movement is by : the tendency for substances to distribute themselves evenly in the environment

Explanation

Question 3 of 30

1

Fill the blank spaces to complete the text.

The rate of diffusion, as outlined by 's Law of Diffusion, is determined by
1. of the Solute: big molecules move slower than small molecules. Small molecules have less collisions and travel further and quicker
2. : the greater the distance traveled, the slower the rate of diffusion. More distance = more collisions = slower diffusion
3. : a shallow concentration gradient = slower diffusion
4. Plasma membrane : substances can only move across if the plasma membrane is permeable to them
5. : The bigger the cell, the larger the surface area, the more opportunity for substances to move across, the higher the rate of diffusion

Explanation

Question 4 of 30

1

The two passive processes of membrane transport include

Select one or more of the following:

Simple diffusion
Facilitated diffusion
Bulk transport
Active transport
Exocytosis

Explanation

Question 5 of 30

1

Simple Diffusion:

Select one or more of the following:

Is a form of passive transport
Involves carrier proteins and binding
Involves substances travelling through the lipid bilayer
Involves substances travelling through protein channels
Requires energy

Explanation

Question 6 of 30

1

In simple diffusion, the following substances enter the cell in the following ways
Through the lipid bilayer
Substances with high lipid solubility
❌
❌
❌
❌
❌
Through protein channels, which can highly selective and gated, or non-selective and open all the time
❌
❌
❌
❌
❌

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O2

CO2

N2

Alcohols

Fatty Acids

Small water soluble molecules

H+

K+

Na+

Ca2+

Explanation

Question 7 of 30

1

Fill the blank spaces to complete the text.

The following is a description of which type of diffusion. The substances traverse the plasma membrane by binding to a protein. The protein undergoes a change. The substance is released on the other side of the membrane. It is employed by essential metabolic substrates such as , amino acids and soluble . This type of diffusion exhibits kinetics. This is

Explanation

Question 8 of 30

1

In saturation kinetics, if the graph shows a plateau then it is facilitated diffusion; but if it keeps rising, then it is simple diffusion.

Select one of the following:

True
False

Explanation

Question 9 of 30

1

Passive processes:
Substances which are ❌ diffuse across the plasma membrane by diffusing through the ❌
❌ diffuse through ❌ which traverse the membrane
❌ and those ❌ to fit through channel proteins diffuse across the membrane by binding through a ❌

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lipid soluble

lipid bilayer

Small water-soluble ions

protein channels

Lipid insoluble substances

too large

carrier protein

Explanation

Question 10 of 30

1

Active process involve the use of metabolic energy and are the mechanisms of substrates moving with their concentration gradient

Select one of the following:

True
False

Explanation

Question 11 of 30

1

Select from the dropdown lists to complete the text.

The two types of active process include ( active transport, bulk transport ) and ( bulk transport, active transport ). ( Bulk transport, Active transport ) has two categories, ( exocytosis, pinocytosis ) and ( endocytosis, phagocytosis ). ( Endocytosis, Active transport ) also has three categories: ( phagocytosis, simple diffusion ), ( pinocytosis, facilitated diffusion ) and ( receptor mediated endocytosis, receptor mediated phagocytosis )

Explanation

Question 12 of 30

1

Active transport

Select one or more of the following:

Is also known as solute pumping
Involves a membrane spanning protein
has a low affinity for the solutes at the binding site on the low concentration side
Binding induces no conformational change
Examplesinclude the H+ ion pump and the Sodium Potassium exchange pump

Explanation

Question 13 of 30

1

A substance can be transported in only one way. Ie a H+ is only ever transported via H+ pump

Select one of the following:

True
False

Explanation

Question 14 of 30

1

Bulk transport is one of the active transport processes and

Select one or more of the following:

involves macromolecules which are too large for diffusion or a solute pump
involves the macromolecules travelling in membrane bound vesicles
Involves no metabolic energy
Has two major types depending on direction: phagocytosis and pinocytosis
Is used to transport hormones, neurotransmitters and enzymes

Explanation

Question 15 of 30

1

Endocytosis is where ❌ are transported into a cell. There are three types. ❌, ❌ (which involves formation of a ❌ which then fuses with a ❌. Used predominantly by ❌ and ❌), and r❌, whereby there is ❌ of macromolecules to a plasma membrane. It is a much more specific interaction.

Drag and drop to complete the text.

macromolecules

Pinocytosis

phagocytosis

phagosome

lysosome

macrophages

white blood cells

eceptor mediated endocytosis

selective binding

Explanation

Question 16 of 30

1

The plasma membrane is highly permeable to water. This is because the O2 molecule is a small, fast moving molecule and has high kinetic energy. It can also enter the cell via protein channels. It moves down its concentration gradient and, unlike other substances, produces a change in volume of the cell

Select one of the following:

True
False

Explanation

Question 17 of 30

1

Water will move down its concentration gradient from an area of low (non-penetrating) solute concentration to an area of high (non-penetrating) solute concentration

Select one of the following:

True
False

Explanation

Question 18 of 30

1

Osmolarity is the quantitative value and direction of osmotic pressure. It can be determined by the concentration of a solution

Select one of the following:

True
False

Explanation

Question 19 of 30

1

The osmolarity is the quantitative value and direction of osmotic pressure. It can be calculated in the following way:

Osmolarity = molarity of a solute x number of particles is dissociates into

Select one of the following:

True
False

Explanation

Question 20 of 30

1

❌ is the relative osmolarity of the bathing solution of a cell
❌: the osmolarity of the bathing solution is ❌ than of the intracellular space of the cell. Water will ❌
❌: the osmolarity of the bathing solution is ❌ the intracellular space of the cell. Water will ❌
❌ the osmolarity of the bathing solution is ❌ the intracellular space of the cell. There will be ❌

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Tonicity

Hypertonic

greater than

leave the cell

Hypotonic

less than

enter the cell

Isotonic:

the same as

no net movement of water

Explanation

Question 21 of 30

1

If you were a well-paid scientist working for a big drug company and were given the task of improving the delivery of a new wonder drug INTO red blood cells, which of the following strategies might you adopt?

1. Increasing the size of the molecule
2. Increasing the lipid solubility of the molecule
3. Decreasing the size of the molecule

Select one or more of the following:

1 only
2 and 3 only
1 & 2 only
2 only
3 only

Explanation

Question 22 of 30

1

Which of the following molecules can move across the plasma membrane of cells by facilitated diffusion?

1. soluble vitamins
2. amino acids
3. enzymes

Select one or more of the following:

1 & 3 only
1 & 2 only
2 only
1 only
1, 2 & 3

Explanation

Question 23 of 30

1

The mechanisms by which substances move across the plasma membrane without the expenditure of metabolic energy are collectively known as?

Select one or more of the following:

pinocytosis
passive processes
solvent pumping
solute pumping
confusion

Explanation

Question 24 of 30

1

Which of the following substances is/are transported across the plasma membrane of cells by receptor-mediated endocytosis?

1. cholesterol.
2. sodium.
3. insulin.

Select one or more of the following:

1 & 3 only
1 only
1 & 2 only
1, 2 & 3
2 only

Explanation

Question 25 of 30

1

The mechanism by which macrophages and some white blood cells are able to ingest cellular debris is known as?

Select one or more of the following:

pinocytosis
phagocytosis
exocytosis
cystic fibrosis
solute pumping

Explanation

Question 26 of 30

1

The rate of diffusion of a molecule is inversely related to its molecular radius because?

Select one or more of the following:

Albert Einstein said
small molecules bounce less than larger molecules following a collision with another molecule
small molecules bounce further than larger molecules following a collision with another molecule
stuffed if I know
large molecules bounce further than smaller molecules following a collision with another molecule

Explanation

Question 27 of 30

1

If two substances had the same molecular weight but one was more soluble in lipids than the other, which would pass through the plasma membrane of a red blood cell the quickest?

Select one or more of the following:

the most expensive one
the one with the highest lipid solubility
the most colourful one
they would both be the same
the one with the lowest lipid solubility

Explanation

Question 28 of 30

1

Which of the following statements about simple diffusion is TRUE?

Select one or more of the following:

the smaller the surface area of a cell the more rapidly substances can diffuse across its membrane
large molecules travel further than small molecules following a collision
substances diffuse from a region of lower concentration to a region of higher concentration
the smaller the molecule the lower the rate of diffusion
diffusion occurs because of the continual random motion of the molecules

Explanation

Question 29 of 30

1

For any substance passing through a membrane by diffusion, the rate of diffusion of this substance will do which of the following?

Select one or more of the following:

be inhibited at 39oC
be unaffected by temperature
decrease as the temperature increases
increase as the temperature decreases
increase as the temperature increases

Explanation

Question 30 of 30

1

Which of the following statements about facilitated diffusion is TRUE?

Select one or more of the following:

following binding between the substance and the carrier protein the substance undergoes a conformational change which results in it being transferred across the membrane
facilitated diffusion is the mechanism by which most lipid-soluble molecules traverse the plasma membrane
in facilitated diffusion a carrier protein with a specific binding site for the substance uses the energy derived from the breakdown of ATP to move the substance across the membrane
the carrier protein can only move substance in one direction regardless of what the concentration gradient is
facilitated diffusion differs from simple diffusion and that only the former exhibits saturation kinetics

	Created by Amanda Ariotti over 8 years ago

Bachelors Degree Medical Physiology 1 (Week 1) Quiz on Week One Medical Physiology: Plasma Membranes, created by Amanda Ariotti on 05/03/2016.

Week One Medical Physiology: Plasma Membranes

Week One Medical Physiology: Plasma Membranes

Question 1 of 30

Name the membrane transport processes

Drag an answer into the correct orange point.

Explanation

Question 2 of 30

Fill the blank spaces to complete the text.

The basic principles of passive membrane transport processes are that: There is no expenditure of The substances move their concentration gradient: moving from area of concentration to concentration Movement is by : the tendency for substances to distribute themselves evenly in the environment

Explanation

Question 3 of 30

Fill the blank spaces to complete the text.

Explanation

Question 4 of 30

The two passive processes of membrane transport include

Select one or more of the following:

Explanation

Question 5 of 30

Simple Diffusion:

Select one or more of the following:

Explanation

Question 6 of 30

In simple diffusion, the following substances enter the cell in the following ways Through the lipid bilayer Substances with high lipid solubility ❌ ❌ ❌ ❌ ❌ Through protein channels, which can highly selective and gated, or non-selective and open all the time ❌ ❌ ❌ ❌ ❌

Drag and drop to complete the text.

Explanation

Question 7 of 30

Fill the blank spaces to complete the text.

Explanation

Question 8 of 30

In saturation kinetics, if the graph shows a plateau then it is facilitated diffusion; but if it keeps rising, then it is simple diffusion.

Select one of the following:

Explanation

Question 9 of 30

Passive processes: Substances which are ❌ diffuse across the plasma membrane by diffusing through the ❌ ❌ diffuse through ❌ which traverse the membrane ❌ and those ❌ to fit through channel proteins diffuse across the membrane by binding through a ❌

Drag and drop to complete the text.

Explanation

Question 10 of 30

Active process involve the use of metabolic energy and are the mechanisms of substrates moving with their concentration gradient

Select one of the following:

Explanation

Question 11 of 30

Select from the dropdown lists to complete the text.

Explanation

Question 12 of 30

Active transport

Select one or more of the following:

Explanation

Question 13 of 30

A substance can be transported in only one way. Ie a H+ is only ever transported via H+ pump

Select one of the following:

Explanation

Question 14 of 30

Bulk transport is one of the active transport processes and

Select one or more of the following:

Explanation

Question 15 of 30

Endocytosis is where ❌ are transported into a cell. There are three types. ❌, ❌ (which involves formation of a ❌ which then fuses with a ❌. Used predominantly by ❌ and ❌), and r❌, whereby there is ❌ of macromolecules to a plasma membrane. It is a much more specific interaction.

Drag and drop to complete the text.

Explanation

Question 16 of 30

Select one of the following:

Explanation

Question 17 of 30

Water will move down its concentration gradient from an area of low (non-penetrating) solute concentration to an area of high (non-penetrating) solute concentration

Select one of the following:

Explanation

Question 18 of 30

Osmolarity is the quantitative value and direction of osmotic pressure. It can be determined by the concentration of a solution

Select one of the following:

Explanation

Question 19 of 30

The osmolarity is the quantitative value and direction of osmotic pressure. It can be calculated in the following way: Osmolarity = molarity of a solute x number of particles is dissociates into

Select one of the following:

Explanation

Question 20 of 30

Drag and drop to complete the text.

Explanation

Question 21 of 30

Select one or more of the following:

The basic principles of passive membrane transport processes are that:
There is no expenditure of
The substances move their concentration gradient: moving from area of concentration to concentration
Movement is by : the tendency for substances to distribute themselves evenly in the environment

In simple diffusion, the following substances enter the cell in the following ways
Through the lipid bilayer
Substances with high lipid solubility
❌
❌
❌
❌
❌
Through protein channels, which can highly selective and gated, or non-selective and open all the time
❌
❌
❌
❌
❌

Passive processes:
Substances which are ❌ diffuse across the plasma membrane by diffusing through the ❌
❌ diffuse through ❌ which traverse the membrane
❌ and those ❌ to fit through channel proteins diffuse across the membrane by binding through a ❌

The osmolarity is the quantitative value and direction of osmotic pressure. It can be calculated in the following way:

Osmolarity = molarity of a solute x number of particles is dissociates into

Which of the following molecules can move across the plasma membrane of cells by facilitated diffusion?

1. soluble vitamins
2. amino acids
3. enzymes

Which of the following substances is/are transported across the plasma membrane of cells by receptor-mediated endocytosis?

1. cholesterol.
2. sodium.
3. insulin.