ANATOMY & PHYSIOLOGY TEST BANK CHAPTER 3
1. 1) About how many cells constitute the body of an adult?
A) 50 to 100 million
B) 50 to 100 billion
C) 50 to 100 trillion
D) 50 to 100 quadrillion: C
2. 2) The body is made up of many different cell types, from small circular red
blood cells to the elongated smooth muscle cells 20X its size. Why is there
such variation in size and shape?
A) Different cell sizes are due to nutritional differences.
B) Different variations in size and shape allow differentiated cell types to
perform unique functions.
C) Variations in cell shape and size are due to chromosomal differences
between cells.
D) Cell size and shape does not vary among cell types.: B
3. 3) The three major parts of a cell are
A) the endoplasmic reticulum, Golgi apparatus, and vesicles.
B) the nucleus, nucleolus, and nuclear envelope.
C) microtubules, ribosomes, and centrosomes.
D) the nucleus, cytoplasm, and cell membrane.: D
4. 4) A cell is surrounded by an extremely thin, flexible membrane. Why is the
membrane selectively permeable?
A) It allows all substances to pass through, making it easier to absorb nutri-
ents.
B) It allows all organic substances to pass through, but excludes all inorganic
substances that could be harmful.
, ANATOMY & PHYSIOLOGY TEST BANK CHAPTER 3
C) It allows some substances to pass through and excludes others based on
size, polarity, and other factors.
D) It does not allow any substances to pass through as they could damage the
cell.: C
5. 5) Cell membranes are described as a fluid mosaic that maintains stability
while still allowing movement. What component maintains most of the flexi-
bility of the membrane?
A) Phospholipid bilayer
B) Integral proteins
C) Polysaccharides
D) Carbohydrates: A
6. 6) The major components of the cell membrane are
A) lipids and carbohydrates.
B) proteins and carbohydrates.
, ANATOMY & PHYSIOLOGY TEST BANK CHAPTER 3
C) lipids and proteins.
D) carbohydrates and polysaccharides.: C
7. 7) Which of the following correctly describes the structural organization of
the cell membrane?
A) A solid, rigid layer of phospholipid with loosely bound protein molecules
B) A bilayer of phospholipid molecules in which protein molecules are embed-
ded and can move
C) Rigid layers of protein molecules in which carbohydrate molecules are
suspended
D) Three layers; lipid on the inside, protein in the middle, and carbohydrates
(and polysaccharides) on the outside: B
8. 8) A protein that spans the cell membrane is termed a(n)
A) receptor protein.
B) integral protein.
C) peripheral protein.
D) anchoring protein.: B
9. 9) Cellular adhesion molecules are
A) peripheral proteins.
B) integral proteins.
C) lipids.
D) receptors.: A
10. 10) When you scrape your skin, white blood cells arrive to fight infection. To
slow down near the site of the cut, they use selectin, which provides traction.
Since selectin helps white blood cells bind to a surface, they are part of a
protein group known as
1. 1) About how many cells constitute the body of an adult?
A) 50 to 100 million
B) 50 to 100 billion
C) 50 to 100 trillion
D) 50 to 100 quadrillion: C
2. 2) The body is made up of many different cell types, from small circular red
blood cells to the elongated smooth muscle cells 20X its size. Why is there
such variation in size and shape?
A) Different cell sizes are due to nutritional differences.
B) Different variations in size and shape allow differentiated cell types to
perform unique functions.
C) Variations in cell shape and size are due to chromosomal differences
between cells.
D) Cell size and shape does not vary among cell types.: B
3. 3) The three major parts of a cell are
A) the endoplasmic reticulum, Golgi apparatus, and vesicles.
B) the nucleus, nucleolus, and nuclear envelope.
C) microtubules, ribosomes, and centrosomes.
D) the nucleus, cytoplasm, and cell membrane.: D
4. 4) A cell is surrounded by an extremely thin, flexible membrane. Why is the
membrane selectively permeable?
A) It allows all substances to pass through, making it easier to absorb nutri-
ents.
B) It allows all organic substances to pass through, but excludes all inorganic
substances that could be harmful.
, ANATOMY & PHYSIOLOGY TEST BANK CHAPTER 3
C) It allows some substances to pass through and excludes others based on
size, polarity, and other factors.
D) It does not allow any substances to pass through as they could damage the
cell.: C
5. 5) Cell membranes are described as a fluid mosaic that maintains stability
while still allowing movement. What component maintains most of the flexi-
bility of the membrane?
A) Phospholipid bilayer
B) Integral proteins
C) Polysaccharides
D) Carbohydrates: A
6. 6) The major components of the cell membrane are
A) lipids and carbohydrates.
B) proteins and carbohydrates.
, ANATOMY & PHYSIOLOGY TEST BANK CHAPTER 3
C) lipids and proteins.
D) carbohydrates and polysaccharides.: C
7. 7) Which of the following correctly describes the structural organization of
the cell membrane?
A) A solid, rigid layer of phospholipid with loosely bound protein molecules
B) A bilayer of phospholipid molecules in which protein molecules are embed-
ded and can move
C) Rigid layers of protein molecules in which carbohydrate molecules are
suspended
D) Three layers; lipid on the inside, protein in the middle, and carbohydrates
(and polysaccharides) on the outside: B
8. 8) A protein that spans the cell membrane is termed a(n)
A) receptor protein.
B) integral protein.
C) peripheral protein.
D) anchoring protein.: B
9. 9) Cellular adhesion molecules are
A) peripheral proteins.
B) integral proteins.
C) lipids.
D) receptors.: A
10. 10) When you scrape your skin, white blood cells arrive to fight infection. To
slow down near the site of the cut, they use selectin, which provides traction.
Since selectin helps white blood cells bind to a surface, they are part of a
protein group known as
