Exam (elaborations)
Bio 101 Exam 2 Practice Material
- Course
- BIO 101
- Institution
- Bergen Community College
This is a comprehensive and detailed practice material that contains questions for Exam 2.
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1) Chapter 5 Review questions
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
2) The fluid mosaic model of the membrane proposed that membranes 2) _______
A) consist of protein molecules embedded in a fluid bilayer of phospholipid s.
B) consist of a phospholipid bilayer composed of a variety of fatty acids.
C) consist of a single layer of phospholipids and proteins.
D) consist of a phospholipid bilayer between two layers of hydrophilic proteins.
3) In what way do the membranes of a eukaryotic cell vary? 3) _______
A) Certain proteins are unique to each kind of membrane.
B) Phospholipids are found only in certain membranes.
C) Only certain membranes of the cell are selectively permeable.
D) Only certain membranes are constructed from amphipathic molecules.
4) Which of the following processes includes all the others? 4) _______
A) diffusion of a solute across a membrane
B) passive transport
C) transport of an ion down its electrochemical gradient
D) osmosis
5) Based on the figure below, which of these experimental treatments would increase the rate of sucrose transport into a
plant cell?
, 5) _______
A) adding a substance that makes the membrane more permeable to hydrogen ions
B) decreasing extracellular pH
C) decreasing cytoplasmic pH
D) decreasing extracellular sucrose concentration
6) The primary structural components of the cell membrane are 6) _______
A) cholesterol and proteins.
B) phospholipids and cellulose.
C) phospholipids and proteins.
D) proteins and cellulose.
E) glycoproteins and cholesterol.
7) Which of the following tend to lack hydrophobic regions on their surface? 7) _______
A) transmembrane proteins
B) cholesterol
C) integral proteins
D) integrins
E) peripheral proteins
8) The movement of the hydrophobic gas nitrous oxide (N2O) (laughing gas) into a cell is an example of 8) _______
A) diffusion through the lipid bilayer.
B) osmosis through the lipid bilayer.
C) cotransport across the lipid bilayer.
D) active transport across the lipid bilayer.
E) facilitated diffusion through the lipid bilayer.
9) Which of the following would diffuse through the lipid bilayer of a plasma membrane most rapidly? 9) _______
A) O2
B) an amino acid
C) glucose
D) Na+
E) starch
10) Water passes quickly through cell membranes because 10) ______
A) it moves through hydrophobic channels.
B) it is a small, nonpolar molecule.
C) the bilayer is hydrophilic.
D) water movement is tied to ATP hydrolysis.
E) it moves through aquaporin channel proteins.
11) Which of the following statements correctly describes the normal tonicity relationships between typical plant and
animal cells and their respective environments? 11) ______
A) Animal cells are generally in a hypotonic solution, and plant cells are generally in an isotonic solution.
B) Animal cells are generally in an isotonic solution, and plant cells are generally in a hypotonic solution.
C) Animal cells are generally in a hypertonic solution, the plant cells are generally in a hypotonic solution.
D) Animal cell are generally in a hypertonic solution, and plant cells are generally in an isotonic solution.
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