Lectures 1+2
Cell Membrane Function and Transport Quiz
Test your knowledge on cell membranes, diffusion, and osmolarity with this engaging quiz! Featuring 18 multiple-choice questions, it covers essential concepts from lectures on membrane structure and fun
- Explore key principles of cell membrane dynamics.
- Understand osmotic effects and transport mechanisms.
- Challenge your comprehension of biological processes.
Regarding the lipid bilayer of the cell membrane, one of the following is wrong:
Lipid-soluble substances cannot move freely through it
It is a thin and pliable, almost entirely made of proteins and lipids
Prevents mixing of ECF & ICF
Water and water-soluble substances cannot move freely through it
Water, ions and watersoluble substances are transported through proteins
According to Fick’s law, the rate of diffusion depends on all of the following except:
The concentration gradient
The permeability of the membrane to a substance
The surface area of the membrane
The molecular weight of a substance
The shape of a substance
Which of the following relation is correct?
When concentration gradient of a substance decreases, rate of diffusion increases
When permeability of membrane to substance increases, rate of diffusion decreases
When surface area of membrane increases, rate of diffusion increases
When molecular weight of substance decreases, rate of diffusion decreases
When distance (Thickness) increases, rate of Diffusion increases
Dephosphorylated conformation X of Na+–K+ pump has:
High affinity for K+ and low affinity for Na+
High affinity for Na+ and low affinity for K+
Low affinity for both Na+ and K+
High affinity for both Na+ and K+
A person who weighs 20 kg, 70% is body water, and 30% is ECF. How much is ECF?
12 L
9 L
6 L
4.5 L
If a cell is equilibrated in A, then moved to B, and after moving no gaining or losing happened, then:
B is identical to A, in osmolarity
B is isotonic compared with A
B is hypotonic compared with A
Two answers are correct
B is hypertonic compared with A
If we add one molecular weight of NaCl (58.5) , one molecular weight of glucose (180) and one molecular weight of calcium chloride (110.89) , what is the osmolarity of this solution?
12000
6000
7400
4000
A cell equilibrated in an aqueous solution of 300 mOsm/L Sodium chloride . Which of the following best describes what will happen to cell volume when the cell is placed in an aqueous solution of 300mOsm/L calcium chloride?
Decrease
No change
Decrease and the increase
Increase
Increase and then decrease
Which of the following transport mechanism can not move sodium ions across a cell membrane?
Simple diffusion
Facilitated diffusion
Primary active transport
Secondary active transport
An artificial membrane is created consisting of a lipid bilayer without protein molecules in the membrane , the lipid composition of the membrane is essentially the same as that of a normal biological membrane . Which of the following substances permeates the membrane more readily than water molecule?
Carbon dioxid
Glucose
Glycerol
Urea
Sodium
One of the following is a correct match:
Hypoaldosteronism => hypo osmotic over hydration
Diabetes insipidus => hyperosmotic dehydration
Congestive heart failure => hypo osmotic dehydration
Over use of diuretics => hyperosmotic dehydration
All of the flowing cause hypernatremia except:
Heavy sweating
Primary aldosteronism
Addison’s disease
Diabetes insipidus
Cushing’s syndrome
Osmotic pressure inside the capillary is caused by:
The blood flow inside the capillary
Plasma proteins
The interstitial fluid
The NaCl concentration gradiant
A solution that contains 300 mmoles of NaCl is considered:
Isotonic
Hypotonic
Normotonic
Hypertonic
If we lose NaCl more than water:
We will have hypo osmotic dehydration
We will have hypo osmotic over hydration
We will have hyper osmotic dehydration
The osmolarity will not change
Extracellular edema happens in case of all except:
Decreased capillary pressure
Nephrotic syndrome
Heart failure
Vitamin C deficiency
Bacterial infections
A pure phospholipid bilayer is most permeable to:
Sodium
Chloride
Oxygen
Water
Calcium
The molarity of a 2% solution of NaCl is 340 mmol/L. The molecular weight of NaCl is 58.5. What is the osmolarity of a 2% solution of NaCl (in mOsm/L )?
680
340
170
510
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