Question 1

Organisms whose cells lack internal,membrane-bound organelles are classified as ________.

Accepted Answer

The answer of Organisms whose cells lack internal,membrane-bound organelles are...

Question 2

Multicellularity does not characterize all types of organisms living today; which eukaryotic kingdoms retain unicellular representatives?

Accepted Answer

A)  protists (slime mold), plants (algae), and fungi (yeast) 
B)  animals (plasmodium), plants (algae), and fungi (yeast) 
C)  protists (algae) and fungi (yeast) 
D)  animals (plasmodium), protists (algae), and fungi (yeast)

Question 3

Strong evidence that multicellularity conveys adaptive value to multicellular organisms is provided by the fact that it

Accepted Answer

A)  evolved within various eukaryotic groups independently. 
B)  first emerged about 1.5 billion years ago. 
C)  reduces the potential for predation. 
D)  allows an organism with relatively small cells to develop a large body.

Question 4

A cell structure that pinches off from a membrane,encloses material,and then fuses with another membrane to release its contents at its destination is called a(n)________.

Accepted Answer

The answer of A cell structure that pinches off from...

Question 5

The magnification of a specimen by a light microscope is a result of

Accepted Answer

A)  the bending of light as it passes through glass lenses. 
B)  the focusing of electron beams by magnets. 
C)  the reflection of light off a specimen. 
D)  using chemicals to physically enlarge cells.

Question 6

In the chloroplast,pancake-like,membrane-bound structures known as ________ are arranged into stacks.

Accepted Answer

The answer of In the chloroplast,pancake-like,membrane-bound structures known as ________...

Question 7

Which of the following statements is FALSE?

Accepted Answer

A)  Actin filaments can change rapidly in length. 
B)  Actin filaments define the paths for vesicle movement within the cell. 
C)  Actin filaments allow cells to change shape. 
D)  Actin filaments allow cells to move.

Question 8

The hydrophobic portions of a membrane's phospholipid bilayer are oriented toward the interior of the membrane and pointed away from aqueous environments.

Accepted Answer

A) True 
 B)False

Question 9

The ________ found in eukaryotic cells have cristae.

Accepted Answer

The answer of The ________ found in eukaryotic cells have...

Question 10

Membrane-enclosed structures in eukaryotic cells are called ________.

Accepted Answer

The answer of Membrane-enclosed structures in eukaryotic cells are called...

Question 11

Volvox,the multicellular green alga shown here,has flagellated cells on its surface cells,but not on interior cells.Which of the following is the most likely explanation for the development of this condition?

Accepted Answer

A)  Interior cells attempt to grow flagella, but the lack of open space suppresses the effort. 
B)  Interior cells discard the genetic instructions for flagella once their interior position is established. 
C)  The commitment of resources for photosynthesis reduces the availability of protein and other biomolecules needed to produce flagella. 
D)  Signals from surface cells or the absence of signals from the environment to the plasma membranes of the interior cells suppresses the growth of flagella.

Question 12

The plasma membrane of a cell and the membrane boundaries of organelles,such as mitochondria and chloroplasts,serve similar functions.What is one of the main functions of the membranes of both cells and organelles?

Accepted Answer

A)  They keep reactants near each other to speed biological reactions. 
B)  They allow external chemicals to diffuse freely into and out of the cell. 
C)  They encourage cellular respiration at the membrane boundaries. 
D)  They keep water out of the cell and organelle interiors.

Question 13

Which of the following diseases is NOT caused by a malfunction of or problem in the lysosomes?

Accepted Answer

A)  Tay-Sachs disease 
B)  storage diseases 
C)  adrenoleukodystrophy (AL
D)  
D)  asbestosis

Question 14

Which of the following molecules is NOT found associated with the plasma membrane?

Accepted Answer

A)  phospholipids 
B)  nucleic acids 
C)  proteins 
D)  carbohydrates

Question 15

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)  Ciliary movement can lead to the eventual release of cells from a cell layer when necessary.

Question 16

Which of the following statements about mitochondria and chloroplasts is FALSE?

Accepted Answer

A)  They were probably primitive eukaryotic cells. 
B)  They contain their own DNA. 
C)  They are able to make some proteins. 
D)  They reproduce independently of the cell in which they reside.

Question 17

The ________ endoplasmic reticulum is covered with ribosomes.

Accepted Answer

The answer of The ________ endoplasmic reticulum is covered with...

Question 18

The ________ is the place where the majority of the genetic material in a eukaryotic cell is stored.

Accepted Answer

The answer of The ________ is the place where the...

Question 19

The definition of life is somewhat arbitrary; the critical aspect(s)that currently define(s)cells as living structures is (are)

Accepted Answer

A)  structural organization, energy dependence, and self-replication. 
B)  nucleic acid housed within a protective, protein-based container. 
C)  size: any carbon-based molecular assembly between 0.1 and 1 µm. 
D)  the presence of at least two classically recognized organelles.

Question 20

Imagine examining a cell using a light microscope; a prokaryote could be distinguished from a eukaryote by the absence of

Accepted Answer

A)  DNA. 
B)  a plasma membrane. 
C)  a nucleus. 
D)  a cell wall.

Exam 3: Cell Structure and Internal Compartments