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Biochem exam 4 multiple choice 2024/2025 Questions With Completed & Verified Solutions.
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Biochem exam 4 multiple choice 2024/2025 Questions With Completed & Verified Solutions.
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Biochem exam 4 multiple choice1) The double bonds in naturally occurring fatty acids are usually _______ isomers.
A) Cis
B) Trans
C) Both cis and trans
D) Essential
E) Nonessential - ANS A
2) Fatty acids react with alcohols to form _____.
A) Amides
B) Ethers
C) Anhydrides
D) Epoxides
E) Esters - ANS E
3) The functions of fat include
A) Insulation
B) Energy storage
C) Water-repellent properties
D) Both A and B are correct
E) All of the above are correct - ANS E
4) Waxes
A) Are complex mixtures of nonpolar lipids
B) Are esters formed from long-chain fatty acids and long-chain alcohols
C) Contain hydrocarbons, sterols, and alcohols
D) Both A and B are correct
E) Both A and C are correct - ANS E
5) Phospholipids are
A) Structural components of membranes
B) Surface active agents
C) Rich energy sources
D) Both A and B are correct
E) All of the above are correct - ANS D
6) Which of the following molecules is not a lipid?
A) Fatty acids
B) Steroids
C) Isoprenoids
D) Waxes
, E) All of the above are lipids - ANS E
7) The basic structure of biological membranes is a consequence of the physical properties of
_______.
A) Proteins
B) Phospholipids
C) Cholesterol
D) Water
E) None of the above is correct - ANS B
8) In the fluid mosaic model of membrane structure
A) Proteins form an inner layer between two layers of lipid
B) Proteins coat an inner layer of lipids
C) Proteins float in a lipid bilayer
D) Proteins are covalently bonded to the lipid bilayer
E) All of the above are true - ANS C
9) Energy requiring transport mechanisms include
A) Primary active transport
B) Diffusion
C) Facilitated diffusion
D) Both A and B are correct
E) Both A and C are correct - ANS A
10) In simple diffusion a solute
A) Is propelled by random molecular motion
B) Moves up its concentration gradient
C) Moves across a membrane because of an input of free energy.
D) Both A and B are correct
E) All of the above are correct - ANS A
11) Which of the following statements is not true?
A) Membrane potential is an electrical gradient across a membrane.
B) A decrease in membrane potential is referred to as membrane depolarization.
C) The term repolarization is defined as the reestablishment of the original membrane potential.
D) The diffusion of potassium ions out of a nerve cell make the inside of the membrane
negative.
E) The sodium channel in muscle and nerve cells is a voltage-gated channel. - ANS D
12) w-6 Fatty acids
A) Have a double bond six carbon atoms from the carbonyl end of the chain
B) Have a double bond six carbon atoms from the methyl end of the chain
C) Have six double bonds in the molecule
D) Have three more double bonds than w-3 fatty acids
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