Question 1

Which of the following components contribute to the structure of the cytoskeleton of a cell?

Accepted Answer

A) microtubules and actin filaments 
B) pseudopodia and motor proteins 
C) chloroplasts and mitochondria 
D) the cell wall and plasma membrane

Question 2

The boundary structure that physically defines a cell is the

Accepted Answer

A) plasma membrane. 
B) protein channel. 
C) hydrophilic layer. 
D) phospholipid side chain.

Question 3

Which of the following statements is false?

Accepted Answer

A) The plasma membrane prevents some molecules from entering the cell. 
B) The plasma membrane prevents some molecules from leaving the cell. 
C) The plasma membrane receives signals from the outside environment. 
D) The plasma membrane is the storehouse for each cell's genetic information.

Question 4

Protists use cilia to move within their habitat, but ciliated human cells like those in the bronchi are always anchored to one another and to an extracellular matrix; what benefit does cilia provide these cells?

Accepted Answer

A) Ciliary movement can dislodge infective bacteria before they permanently fasten to the plasma membrane. 
B) The oxygen content of the extracellular fluid can be increased by agitation with cilia. 
C) Ciliary movement can create currents that move secretions like mucus over the surface of a tissue. 
D) all of the above

Question 5

Advancement in biology was hindered by the concept of spontaneous generation, the belief that nonliving objects could spontaneously come to life. What aspect of the cell theory specifically refutes this idea?

Accepted Answer

A) Every living organism is composed of one or more cells. 
B) All living cells come from preexisting cells. 
C) Cells are the smallest unit of life possible on Earth. 
D) The components of a cell do not individually retain the distinctive characteristics of life.

Question 6

The hydrophobic portions of a membrane's phospholipid bilayer are oriented toward the interior of the membrane.

Accepted Answer

A) True 
 B)False

Question 7

The inner membranes of both mitochondria and chloroplasts are folded into various arrangements. What is the advantage of having a folded membrane rather than a simple interior membrane that follows the same oval shape as the exterior membrane?

Accepted Answer

A) The folds in the membranes are a physical barrier for compounds attempting to enter the organelle. 
B) The folds allow for more surface area for the chemical reactions that occur across the inner membranes. 
C) The folds allow these organelles to interact more efficiently with Golgi bodies. 
D) The folds cause a necessary change in the organelles' internal pH.

Exam 6: Cell Structure and Internal Compartments