Question 1

Which of the following is incorrect about both lysosomes and microbodies?

Accepted Answer

A)  They lack DNA. 
B)  They remove compounds generated within the cell. 
C)  They contain hydrolytic enzymes. 
D)  They are surrounded by a single membrane. 
E)  They lack ribosomes.

Question 2

In a cell membrane, why must the hydrophobic and hydrophilic molecules of the phospholipid bilayer arrange in a strict orientation?

Accepted Answer

A)  Hydrophobic tails face outwards to prevent too much water entering the cell, which would otherwise result in the cell lysing. 
B)  Hydrophilic heads face inwards so that water is drawn in to the cell to maintain H2O levels. 
C)  Hydrophilic tails face inwards and hydrophobic heads face outwards to maintain the structural and functional integrity of the membrane, thus controlling the movement of solutes. 
D)  Hydrophilic heads face inwards and hydrophobic tails face outwards to maintain the structural and functional integrity of the membrane, thus controlling the movement of solutes. 
E)  Hydrophobic tails face inwards and hydrophilic heads face outwards to maintain the structural and functional integrity of the membrane, thus controlling the movement of solutes.

Question 3

The double mitochondrial membrane allows the generation of potential energy because the

Accepted Answer

A)  composition and chemical structure of the inner and outer membranes are very similar. 
B)  inner membrane is highly permeable to most substances allowing ions to flow into the matrix. 
C)  inner membrane is highly impermeable not allowing passage of ions and molecules. 
D)  outer membrane is highly impermeable not allowing passage of ions and molecules. 
E)  outer membrane is highly impermeable allowing H+ ions to accumulate on the inner surface of the inner mitochondrial membrane.

Question 4

In eukaryotes, microtubules are

Accepted Answer

A)  strong, stable and resistant to stretching. 
B)  less rigid than microfilaments and can provide less mechanical support. 
C)  involved in chromosome separation during cell division. 
D)  found only in cilia and flagella. 
E)  composed of actin and provide the cytoskeleton of the cell.

Question 5

If you viewed the following through a light microscope, in which would you expect to see the largest, darkest nucleolus?

Accepted Answer

A)  An animal cell that was actively producing large amounts of protein 
B)  A red blood cell 
C)  An animal cell that was involved in little protein production 
D)  An animal cell at metaphase of mitosis 
E)  A plant cell during cell division

Exam 4: Functioning Cells

Which of the following is incorrect about both lysosomes and microbodies?

In a cell membrane, why must the hydrophobic and hydrophilic molecules of the phospholipid bilayer arrange in a strict orientation?

The double mitochondrial membrane allows the generation of potential energy because the

In eukaryotes, microtubules are

If you viewed the following through a light microscope, in which would you expect to see the largest, darkest nucleolus?