Week One Medical Physiology: Plasma Membranes

Questão 1 de 30

1

Name the membrane transport processes

Arraste a resposta correta para cada ponto laranja.

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

Explicação

Questão 2 de 30

1

Preencha os espaços em branco para completar o texto.

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

Explicação

Questão 3 de 30

1

Preencha os espaços em branco para completar o texto.

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

Explicação

Questão 4 de 30

1

The two passive processes of membrane transport include

Selecione uma ou mais das seguintes:

Simple diffusion
Facilitated diffusion
Bulk transport
Active transport
Exocytosis

Explicação

Questão 5 de 30

1

Simple Diffusion:

Selecione uma ou mais das seguintes:

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

Explicação

Questão 6 de 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
❌
❌
❌
❌
❌

Arraste e solte para completar o texto.

O2

CO2

N2

Alcohols

Fatty Acids

Small water soluble molecules

H+

K+

Na+

Ca2+

Explicação

Questão 7 de 30

1

Preencha os espaços em branco para completar o texto.

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

Explicação

Questão 8 de 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.

Selecione uma das opções:

VERDADEIRO
FALSO

Explicação

Questão 9 de 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 ❌

Arraste e solte para completar o texto.

lipid soluble

lipid bilayer

Small water-soluble ions

protein channels

Lipid insoluble substances

too large

carrier protein

Explicação

Questão 10 de 30

1

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

Selecione uma das opções:

VERDADEIRO
FALSO

Explicação

Questão 11 de 30

1

Selecione das listas do Menu para completar o texto.

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 )

Explicação

Questão 12 de 30

1

Active transport

Selecione uma ou mais das seguintes:

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

Explicação

Questão 13 de 30

1

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

Selecione uma das opções:

VERDADEIRO
FALSO

Explicação

Questão 14 de 30

1

Bulk transport is one of the active transport processes and

Selecione uma ou mais das seguintes:

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

Explicação

Questão 15 de 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.

Arraste e solte para completar o texto.

macromolecules

Pinocytosis

phagocytosis

phagosome

lysosome

macrophages

white blood cells

eceptor mediated endocytosis

selective binding

Explicação

Questão 16 de 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

Selecione uma das opções:

VERDADEIRO
FALSO

Explicação

Questão 17 de 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

Selecione uma das opções:

VERDADEIRO
FALSO

Explicação

Questão 18 de 30

1

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

Selecione uma das opções:

VERDADEIRO
FALSO

Explicação

Questão 19 de 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

Selecione uma das opções:

VERDADEIRO
FALSO

Explicação

Questão 20 de 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 ❌

Arraste e solte para completar o texto.

Tonicity

Hypertonic

greater than

leave the cell

Hypotonic

less than

enter the cell

Isotonic:

the same as

no net movement of water

Explicação

Questão 21 de 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

Selecione uma ou mais das seguintes:

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

Explicação

Questão 22 de 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

Selecione uma ou mais das seguintes:

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

Explicação

Questão 23 de 30

1

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

Selecione uma ou mais das seguintes:

pinocytosis
passive processes
solvent pumping
solute pumping
confusion

Explicação

Questão 24 de 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.

Selecione uma ou mais das seguintes:

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

Explicação

Questão 25 de 30

1

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

Selecione uma ou mais das seguintes:

pinocytosis
phagocytosis
exocytosis
cystic fibrosis
solute pumping

Explicação

Questão 26 de 30

1

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

Selecione uma ou mais das seguintes:

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

Explicação

Questão 27 de 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?

Selecione uma ou mais das seguintes:

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

Explicação

Questão 28 de 30

1

Which of the following statements about simple diffusion is TRUE?

Selecione uma ou mais das seguintes:

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

Explicação

Questão 29 de 30

1

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

Selecione uma ou mais das seguintes:

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

Explicação

Questão 30 de 30

1

Which of the following statements about facilitated diffusion is TRUE?

Selecione uma ou mais das seguintes:

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

	Criado por Amanda Ariotti quase 9 anos atrás

Bachelors Degree Medical Physiology 1 (Week 1) Quiz sobre Week One Medical Physiology: Plasma Membranes, criado por Amanda Ariotti em 05-03-2016.

Week One Medical Physiology: Plasma Membranes

Questão 1 de 30

Name the membrane transport processes

Arraste a resposta correta para cada ponto laranja.

Explicação

Questão 2 de 30

Preencha os espaços em branco para completar o texto.

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

Explicação

Questão 3 de 30

Preencha os espaços em branco para completar o texto.

Explicação

Questão 4 de 30

The two passive processes of membrane transport include

Selecione uma ou mais das seguintes:

Explicação

Questão 5 de 30

Simple Diffusion:

Selecione uma ou mais das seguintes:

Explicação

Questão 6 de 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 ❌ ❌ ❌ ❌ ❌

Arraste e solte para completar o texto.

Explicação

Questão 7 de 30

Preencha os espaços em branco para completar o texto.

Explicação

Questão 8 de 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.

Selecione uma das opções:

Explicação

Questão 9 de 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 ❌

Arraste e solte para completar o texto.

Explicação

Questão 10 de 30

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

Selecione uma das opções:

Explicação

Questão 11 de 30

Selecione das listas do Menu para completar o texto.

Explicação

Questão 12 de 30

Active transport

Selecione uma ou mais das seguintes:

Explicação

Questão 13 de 30

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

Selecione uma das opções:

Explicação

Questão 14 de 30

Bulk transport is one of the active transport processes and

Selecione uma ou mais das seguintes:

Explicação

Questão 15 de 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.

Arraste e solte para completar o texto.

Explicação

Questão 16 de 30

Selecione uma das opções:

Explicação

Questão 17 de 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

Selecione uma das opções:

Explicação

Questão 18 de 30

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

Selecione uma das opções:

Explicação

Questão 19 de 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

Selecione uma das opções:

Explicação

Questão 20 de 30

Arraste e solte para completar o texto.

Explicação

Questão 21 de 30

Selecione uma ou mais das seguintes:

Explicação

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.