Question 1

In an experiment in the laboratory, a small colored molecule is injected into one cell. Within minutes, the molecule has entered the adjacent cells. What type of junctions connect these cells?

Accepted Answer

A)   gap junctions
B)   free junctions
C)   adhesion junctions
D)   tight junctions
E)   actin junctions A

Question 2

Why type of junctions must there be between cells to form a barrier?

Accepted Answer

A)   adhesion junctions
B)   gap junctions
C)   tight junctions
D)   channel junctions
E)   free junctions C

Question 3

In developing embryos such as a chicken, what restores the amount of surface area needed for exchange requirements?

Accepted Answer

A)   respiration
B)   catabolism
C)   anabolism
D)   cell division
E)   assimilation D

Question 4

Viruses are not made up of cells. According to cell theory, this means what?

Accepted Answer

A)   Viruses can cause disease.
B)   Cells come only from pre-existing cells.
C)   Cells can be infected by viruses.
D)   Viruses are not living.
E)   Cells and viruses are the same thing.

Question 5

Which of the following can cross the plasma membrane because of its selective permeability?

Accepted Answer

A)   gases such as oxygen and carbon dioxide
B)   ions
C)   large, polar molecules
D)   large, nonpolar molecules
E)   glycoproteins

Question 6

Which of the following structures are present in both eukaryotes and prokaryotes?

Accepted Answer

A)   plasma membrane
B)   nucleus
C)   endoplasmic reticulum
D)   Golgi body
E)   mitochondria

Question 7

Centrosomes are associated with

Accepted Answer

A)   ribosomes.
B)   mitochondria.
C)   chromosomes.
D)   microtubules.
E)   lysosomes.

Question 8

Only glucose can be used as an energy source in the human body.

Accepted Answer

A) True 
 B)False

Question 9

What are the folds in mitochondrial membranes called?

Accepted Answer

A)   matrix
B)   cristae
C)   rugae
D)   lumen
E)   villi

Question 10

Explain the functions of adhesion junctions, gap junctions, and tight junctions in human cells.

Accepted Answer

The answer of Explain the functions of adhesion junctions, gap...

Question 11

Because bacteria are prokaryotes, they do not have DNA.

Accepted Answer

A) True 
 B)False

Question 12

Whose work proved conclusively that spontaneous generation of life from nonlife was not possible?

Accepted Answer

A)   Louis Pasteur
B)   Charles Darwin
C)   John Ray
D)   Walther Flemming
E)   Georges Cuvier

Question 13

During a hurricane, salt water invades fresh water marshes causing many of the plants to die. The plants are killed because the salt water solution is __________________ to the plants, drawing water from their cells.

Accepted Answer

A)   isotonic
B)   hypotonic
C)   mesotonic
D)   oligotonic
E)   hypertonic

Question 14

Angela would like to look at living algae from pond water. What type of equipment should she use?

Accepted Answer

A)   compound light microscope
B)   transmission electron microscope
C)   scanning electron microscope
D)   magnifying glass
E)   her naked eye

Question 15

The first day of football practice was rough on the squad. During practice the players complained of cramps and sore muscles. The reason for their complaints was that there was a __________________ build up in their muscles.

Accepted Answer

A)   glucose
B)   alcohol
C)   carbon dioxide
D)   carbon monoxide
E)   lactate

Question 16

If you could remove all the phosphate in the cell, what would happen to the ATP cycle?

Accepted Answer

A)   It would stop when all the ATP had been converted into ADP.
B)   It would stop when all the ADP had been converted into ATP.
C)   It would cycle faster because the lack of phosphate would drive the cycle.
D)   It would cycle faster because of the buildup of ATP.
E)   It would not affect the ATP cycle.

Question 17

Which of the following is not a function of the plasma membrane?

Accepted Answer

A)   determines which substances enter and leave the cell
B)   serves as a boundary between the cell and its environment
C)   contains receptor sites which determine how the cell interacts with its environment
D)   contains the genetic information
E)   marks the cell as belonging to a particular individual

Question 18

Brett needs to distinguish two points that are 0.5 mm apart. What is the easiest way to do this?

Accepted Answer

A)   Use a transmission electron microscope.
B)   Use a compound light microscope.
C)   Use his eyes.
D)   Use a magnifying glass.
E)   Use a scanning electron microscope.

Question 19

Which organelle can be likened to a post office?

Accepted Answer

A)   nucleus
B)   nucleolus
C)   mitochondria
D)   endoplasmic reticulum
E)   Golgi apparatus

Question 20

What is the function of cholesterol in the plasma membrane?

Accepted Answer

A)   cell marker
B)   receptor
C)   support
D)   channel
E)   enzyme

Exam 3: Cell Structure and Function