Question 1

Membrane proteins are not very soluble in water, because they possess long stretches of non-polar amino acids that are

Accepted Answer

A) too long to interact with the water molecules. 
B) hydrophobic. 
C) are transmembranal. 
D) hydrophilic. 
A) too long to interact with the water molecules. 
B) hydrophobic. 
C) are transmembranal. 
D) hydrophilic.

Question 2

Which egg is isotonic to the solution?

Accepted Answer

A) Egg 1 
B) Egg 2 
C) Egg 3 
A) Egg 1 
B) Egg 2 
C) Egg 3

Question 3

A mixed solution of water and small molecules is exposed to a cell membrane and allowed to interact for an hour.Which molecule would be most likely to cross the phospholipid bilayer without the aid of transport proteins and diffuse across the membrane the fastest?

Accepted Answer

A) Water 
B) NH4+ 
C) NH3 
D) CH3COO- 
A) Water 
B) NH4+ 
C) NH3 
D) CH3COO-

Question 4

What is the main component of an animal cell membrane?

Accepted Answer

A) phospholipids 
B) polynucleotides 
C) aquaporins 
D) glycolipids 
A) phospholipids 
B) polynucleotides 
C) aquaporins 
D) glycolipids

Question 5

Membrane potential will affect the directional movement of

Accepted Answer

A) Glucose (C6H12O6) 
B) Cholesterol 
C) Potassium (K+) 
D) Oxygen (O2) 
A) Glucose (C6H12O6) 
B) Cholesterol 
C) Potassium (K+) 
D) Oxygen (O2)

Question 6

How are the tails and heads of membrane phospholipids oriented in their environment?

Accepted Answer

A) The hydrophobic heads are oriented towards each other and the hydrophillic tails are oriented towards the extracellular fluid and the intracellular fluid. 
B) The hydrophillic tails are oriented towards each other and the hydrophobic heads are oriented towards the extracellular fluid and the intracellular fluid. 
C) The hydrophobic tails are oriented towards each other and the hydrophillic heads are oriented towards the extracellular fluid and the intracellular fluid. 
D) The hydrophillic heads are oriented towards each other and the hydrophobic tails are oriented towards the extracellular fluid and the intracellular fluid. 
A) The hydrophobic heads are oriented towards each other and the hydrophillic tails are oriented towards the extracellular fluid and the intracellular fluid. 
B) The hydrophillic tails are oriented towards each other and the hydrophobic heads are oriented towards the extracellular fluid and the intracellular fluid. 
C) The hydrophobic tails are oriented towards each other and the hydrophillic heads are oriented towards the extracellular fluid and the intracellular fluid. 
D) The hydrophillic heads are oriented towards each other and the hydrophobic tails are oriented towards the extracellular fluid and the intracellular fluid.

Question 7

The rate of diffusion will increase as

Accepted Answer

A) the number of glucose molecules decreases. 
B) the number of glucose molecules increases. 
C) temperature decreases. 
D) pH rises. 
A) the number of glucose molecules decreases. 
B) the number of glucose molecules increases. 
C) temperature decreases. 
D) pH rises.

Question 8

Carrier proteins are saturated at which point?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
A) 1 
B) 2 
C) 3 
D) 4

Question 9

The plasma membrane is a thin sheet of lipid embedded with

Accepted Answer

A) proteins. 
B) carbohydrates. 
C) polymers. 
D) nucleotides. 
A) proteins. 
B) carbohydrates. 
C) polymers. 
D) nucleotides.

Question 10

A scientist performs an experiment in which they create an artificial cell with a selectively permeable membrane through which only water can pass.They inject a 5M solution of glucose into the cell and then place the cell into a beaker of water.After an hour, what effect do you expect to observe?

Accepted Answer

A) Water moves out of the cell 
B) Glucose moves out of the cell 
C) No net change in cell weight 
D) Water moves into the cell 
A) Water moves out of the cell 
B) Glucose moves out of the cell 
C) No net change in cell weight 
D) Water moves into the cell

Question 11

A novice gardener notices that many plants in his garden look wilted.What osmotic solution would you suggest the novice gardener use to best return the plants to full health?

Accepted Answer

A) Place the plants in a 15% solute solution so water can be actively transported out of the plant cells. 
B) Place the plants in a 5% solute solution so water can be actively transported out of the plant cells. 
C) Place the plants in a 5% solute solution so water can diffuse into the plant cells. 
D) Place the plants in a 15% solute solution so water can diffuse out of the plant cells. 
A) Place the plants in a 15% solute solution so water can be actively transported out of the plant cells. 
B) Place the plants in a 5% solute solution so water can be actively transported out of the plant cells. 
C) Place the plants in a 5% solute solution so water can diffuse into the plant cells. 
D) Place the plants in a 15% solute solution so water can diffuse out of the plant cells.

Question 12

Membrane fluidity is affected by

Accepted Answer

A) temperature, cholesterol, types of fatty acids. 
B) size of molecules, polarity of molecules, temperature. 
C) types of fatty acids, waters affinity for hydrogen bonding. 
D) hyrophillic tails, hydrophobic heads, cholesterol. 
A) temperature, cholesterol, types of fatty acids. 
B) size of molecules, polarity of molecules, temperature. 
C) types of fatty acids, waters affinity for hydrogen bonding. 
D) hyrophillic tails, hydrophobic heads, cholesterol.

Exam 5: Membranes

Membrane proteins are not very soluble in water, because they possess long stretches of non-polar amino acids that are

Which egg is isotonic to the solution?

A mixed solution of water and small molecules is exposed to a cell membrane and allowed to interact for an hour.Which molecule would be most likely to cross the phospholipid bilayer without the aid of transport proteins and diffuse across the membrane the fastest?

What is the main component of an animal cell membrane?

Membrane potential will affect the directional movement of

How are the tails and heads of membrane phospholipids oriented in their environment?

The rate of diffusion will increase as

Carrier proteins are saturated at which point?

The plasma membrane is a thin sheet of lipid embedded with

A scientist performs an experiment in which they create an artificial cell with a selectively permeable membrane through which only water can pass.They inject a 5M solution of glucose into the cell and then place the cell into a beaker of water.After an hour, what effect do you expect to observe?

A novice gardener notices that many plants in his garden look wilted.What osmotic solution would you suggest the novice gardener use to best return the plants to full health?

Membrane fluidity is affected by

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