Biochemistry MCQs
Biochemistry MCQs
Answer these 100+ Biochemistry MCQs and see how sharp is your knowledge of Biochemistry. Scroll down and let's start!
1: ______ is a steroid.
A. Butter
B. Sucrose
C. Amino acid
D. Estrogen
2: A peptide bond binds _____.
A. Polymer ... glucose molecules
B. A nucleotide is to a nucleic acid
C. They are large polymers.
D. Amino acids together in a protein
E. Maltose + water ... dehydration synthesis
3: An extremely efficient enzyme has a _____ km and a _____ kcat.
A. Small; small
B. Small; large
C. Large; large
D. Large; small
4: Atoms from the amino acids _____ are utilized in purine biosynthesis.
A. Gln, Asp
B. Gln, Asp, Gly
C. Gly, Asp
D. Gln, Asp, Gly, Phe
E. None of the above
5: Compared to an uncatalyzed reaction, an enzyme-catalyzed reaction ________.
A. PH 7 and 37 C
B. Lipase
C. Coenzyme
D. Occurs at a faster rate
E. Oxidoreductase
6: Denaturing gel electrophoresis separates proteins based on differences in _______.
A. A means of detecting the protein
B. The amino acid sequences of proteins
C. Edman degradation
D. Peptides
7: Enthalpy (h) is the _____.
A. System's entropy
B. Cell's energy equilibrium
C. Condition of a cell that is not able to react
D. Total energy in biological systems
8: Eukaryotic initiation begins with the assembly of ________________.
A. Preinitiation complex
B. Cap-binding complex
C. Poly-binding complex
D. 48S Initiation complex
9: Fat molecules do not ________.
A. Mix with H2O
B. Mix with H
C. Mix with C
D. None of these
10: Fats are generally ________ at room temperature and are obtained from ________.
A. Solids; animals
B. Solids; plants
C. Liquids; plants
D. Liquids; animals
11: In a hydrolysis reaction, __________, and in this process, water is __________.
A. A polymer is broken up into its constituent monomers...consumed
B. A nucleotide is to a nucleic acid
C. Energy storage and release
D. Dehydration or condensation reactions
12: In living organisms, dna exists as a __________ with the strand(s) __________.
A. Molecules; chaperonins
B. Glycosidic; linkages
C. Disaccharide; double helix
D. Energy stored; energy released
E. Double helix; running antiparallel
13: In terms of energy storage, _______ is to animals what _______ is to plants.
A. Lactose; starch
B. Sucrose; glucose
C. Glycogen; starch
D. Glucose; fructose
E. Monosaccharides; disaccharides
14: In the peptide glviw, the c-terminal end is ________.
A. Glycerolphospholipids
B. Glycine
C. Arachidonic
D. Tryptophan
15: In the process of nitrification, nitrate reductase converts _____ into _____.
A. Nitrate; nitrogen
B. Nitrate; ammonia
C. Nitrate; nitrite
D. Nitrate; nitric oxide
E. Nitrogen; nitrate
16: Macromolecules, the molecules of life, include all of the following except __________.
A. Proteins
B. Carbohydrates
C. Trace elements
D. All of the molecules listed are macromolecules.
E. Nucleic acids
17: Monosaccharide + monosaccharide → ______ + water
A. Disaccharide
B. Polypeptide
C. Polysaccharide
D. Fat
18: Myoglobin and a single chain of hemoglobin have similar ______ structures.
A. Primary
B. Secondary
C. Tertiary
D. Quaternary
E. None of the above
19: Oils are generally ________ at room temperature and are obtained from ________.
A. Solids; animals
B. Liquids; plants
C. Liquids; animals
D. Solids; plants
E. None of the above
20: Poisons like cyanide bind to ________ and prevent electron transfer.
A. Mitochondria
B. The endoplasmic reticulum
C. Cytochromes
D. Enzymes
E. Acetyl-CoA
21: Side chains of amino acids _____.
A. A phosphorus atom, P
B. May be polar or nonpolar
C. The components of the R-group
D. It acts as an acid and loses a proton, giving it a negative charge
22: The melting temperature of dna ________ with increasing g plus c content.
A. Decreases
B. Increases
C. Has no relation
D. Stays the same
23: The skeletal structure below is that of a ________.
A. Wax
B. Fat
C. Stearic
D. Oleic
24: Which of the following statements is false? saturated fats _____.
A. Usually solidify at room temperature
B. Are more common in animals than in plants
C. Contain more hydrogen than unsaturated fats that consist of the same number of carbon atoms
D. Have many double bonds in the carbon chains of their fatty acids
25: Transgenic animals are currently used ______.
A. As vectors for use in cloning human DNA
B. As food
C. To produce potentially useful proteins
D. All of the above
26: To make restriction fragments, a dna sample is treated with ______.
A. DNA ligase
B. Restriction enzymes
C. Gel electrophoresis
D. PCR
27: As water freezes ______.
A. It loses its polarity
B. It cools the surrounding environment
C. Its molecules move farther apart
D. Its hydrogen bonds break apart
28: A lineweaver-burk plot is a _____.
A. Double reciprocal plot
B. Michaelis-Menten plot
C. Sigmoidal plot
D. Hyperbolic plot
29: The stoichiometry of the atp synthase f0 base is ________.
A. A2b2c(10-14)
B. A3b3c3
C. Ab2c(10-14)
D. Abc(10-14
30: Phosphofructokinase is allosterically _____ by high concentrations of _____.
A. Activated; ATP
B. Inhibited; ATP
C. Inhibited; fructose-2,6-bisphosphate
D. Activated; fructose -2,6-bisphosphate
31: The nucleotide sequence of a polynucleotide chain is called the ________ structure.
A. Primary
B. Secondary
C. Local
D. None of these
32: The amphipathic property of phospholipids can be described as ________.
A. Polar region that dissolves in water and a nonpolar region that repels water
B. Polar region that repels water and a nonpolar region that dissolves in water
C. Both regions dissolved in water
D. Both regions repel water
33: __________ is always involved in hydrolysis reactions.
A. ATP
B. H+
C. OH- Synthesis.
D. Water
34: Sticky ends are produced as a result of the action of ______.
A. A clone
B. DNA ligase
C. A restriction enzyme
D. Humulin
35: A higher concentration of molecules causes a faster chemical reaction. this is known as _____.
A. The law of mass action
B. Chemical equilibrium phenomenon
C. Activation energy
D. Metabolism
36: Biochemistry is the study of _____
A. Polar molecule regulates temperature universal solvent
B. Ionic bond
C. Number of protons
D. Energy and matter within living organisms
37: Centrifuges used for biohazardous materials must be covered primarily to avoid _____.
A. Continuously drawing air into the cabinet prevents contaminated air out the open face area.
B. No more than 1% of the body weight at one time
C. Contamination via aerosol formation.
D. BioSafety Level (BSL)2
38: The co2 produced in the pentose phosphate shunt comes from carbon number _____ of glucose.
A. 1 A COOH group at the end of the carbon skeleton evolves into a CO2 group.
B. 2
C. 6
D. None of these
39: Cellulose is a polysaccharide with ______ linkages?
A. B-1,6-glycosidic
B. A-1,6-glycosidic
C. A-1.4-glycosidic
D. B-1.4'-glycosidic
40: 3 % nacl is _________________ to the elodea leaf.
A. Hypertonic
B. Hypotonic
C. Isotonic
D. Thylakoid
41: In eukaryotes, the first step in the control of gene expression is ______.
A. A.transcription
B. MRNA stability control
C. RNA processing
D. Chromatin remodeling
42: Glycogen is to animal cells as ________ is to plant cells.
A. Cellulose
B. Lipid
C. Sugar
D. Protein
E. Starch
43: Fatty acid groups are referred to as ________ groups.
A. Acetyl
B. Acyl
C. Prenyl
D. Isoprenoid
E. Isopentenyl
44: This figure is an example of a(n) _____.
A. Steroid
B. Protein
C. Unsaturated fat
D. Nucleic acid
E. Saturated fat
45: During the citric acid cycle, both nad and fad ________ a hydrogen atom and become ________.
A. Gain; reduced
B. Gain; stable
C. Reduce; gained
D. Reduce; stable
46: Each specific amino acid has a unique ______.
A. R group
B. Carboxyl group
C. Phosphate group
D. Amino group
47: The hormone __________ induces lipolysis, whereas the hormone __________ inhibits the process.
A. Epinephrine; adrenocorticotropic hormone
B. Glucagon; insulin
C. Insulin; norepinephrine
D. Glucagon; norepinephrine
E. Epinephrine; glucagon
48: Enzymes that hydrolyze lipids are ________; substances that emulsify lipids are ________.
A. Considerably more energy than carbohydrates.
B. β-oxidation process.
C. Pancreatic lipases; bile salts
D. Small intestine
49: Anomers of d-glucopyranose differ in their stereochemistry at ________.
A. C5
B. C4
C. C2
D. C1
50: The membrane's permeability to sodium ions is at its maximum at label _____.
A. A
B. B
C. C
D. D
51: The redundancy of the genetic code is a consequence of ______.
A. Having more codons than amino acids
B. Having four different letters (As, Cs, Gs, and Us) in the genetic alphabet
C. Having fewer codons than there are amino acids
D. Having three-letter-long genetic words (codons
52: Evan and evelyn are twins but are not genetically identical. they are ________ twins.
A. Gamete
B. Dizygotic
C. Monozygotic
D. Zygote
53: Prostaglandins are involved in _________.
A. Ovulation
B. Inflammation
C. Digestion
D. Both A and B are correct
E. All of the above are correct
54: Healthy cells produce ________ in response to interferons.
A. NOD
B. MACs
C. Antiviral proteins
D. Antimicrobial peptides
E. TLRs
55: Most ______ have well defined 3' ends terminating in poly(a) tails of ~ 200 nucleotides.
A. Eukaryotic mRNAs
B. Prokaryotic mRNAs
C. All of the above
D. Prokaryotic rRNAs
E. Eukaryotic rRNAs
56: Much of the stability of the double-stranded dna structure is the result of ________.
A. The stacking interactions between base pair
B. Hydrogen bonding between purines
C. The angle of the planes of the bases with respect to the helix axis
D. The phosphodiester backbone
57: An acid can denature a protein by ________.
A. Agitating the protein chains
B. Disrupting hydrogen bonds between side chains
C. Disrupting hydrophobic interactions within a protein chain
D. Removing helping molecules such as home
E. Breaking disculfide bridges
58: Biochemical tests _________________.
A. Are the main methods used to identify unknown bacteria
B. Are used to determine rate of growth
C. Are the most effective way to determine bacterial shape
D. Are visualized using microscopes
59: For a molecule to have optical isomers, it must have _____.
A. At least one asymmetric carbon
B. At least two asymmetric carbon
C. At least three asymmetric carbon
D. None of these
60: For a protein to be an integral membrane protein, it would have to be _____.
A. Hydrophilic
B. Hydrophobic
C. Amphipathic, with at least one hydrophobic region
D. Exposed on only one surface of the membrane
61: Maltose has a (1→4) linkage between glucose and ________.
A. Glucose
B. Carbohydrates
C. Hydrogen
D. None of the above
62: Sugars are molecules that have __________ c:h:o and are called __________.
A. 1:2:1 ratio of; carbohydrates
B. Less C and H than O in; lipids
C. Equal amounts of; carbohydrates
D. A 2:1:2 ratio of; carbohydrates
E. More C and H than O in; proteins
63: The formation of an enzyme-substrate complex is the ________ step in enzyme action.
A. First
B. Second
C. Third
D. Fourth
64: The relation between amino acid and polypeptide is similar to the relation between ________.
A. Nucleotide and Nucleic acid
B. The position of the carbonyl group
C. Branched amylopectin and unbranched amylose
D. Three amino acids and two peptide bonds
65: Conventional genetic analyses of rrna sequences is not possible for prions because __________.
A. They are too small to be analyzed genetically.
B. They cannot be isolated in a pure form.
C. They do not contain rRNA.
D. They do not contain nucleic acids.
66: Complete the equation: monosaccharide + monosaccharide ? ______ + water
A. Disaccharide.
B. Polypeptide.
C. Polysaccharide.
D. Fat.
67: Because bile is not secreted into the duodenum with cirrhosis, stools are _____ colored.
A. GERD
B. Clay
C. Cecum
D. None of these
68: Guided by powerful signaling molecules, the human heart develops from __________.
A. Myocardium
B. Endocardium
C. Epicardium
D. Mesoderm
69: Chemoreceptors that monitor o2 and co2 content and ph are located in the _________.
A. Decreased po2 in the alveoli
B. Medulla oblongata, carotid arteries, and aorta
C. Dorsal respiratory, diaphragm, vagus
D. Ischemic hypoxia
70: Atoms with the same number of protons but with different electrical charges _____
A. Are different ions (ions are charged atoms)
B. An attraction between ions of a different charge
C. 6, atomic number is the number of protons
D. All of this
71: Chymotrypsin catalyzes the hydrolysis of a peptide bond and is therefore categorized as a _____.
A. Hydrolase
B. K+ efflux
C. It has no effect
D. None of this
72: Rotation about a carbon-carbon double bond does not readily occur because _________.
A. The overlap of the p orbitals of the carbon-carbon π bond would be lost
B. Non-superimposable mirror image
C. Superimposable mirror image identical molecules
D. None of these
73: The energy for the polymerization of nucleotides comes from____.
A. The hydrolysis of phosphate groups from nucleoside triphosphates
B. Sugar-phosphate linkage
C. The 2' OH increases the reactivity of RNA
D. None of these
74: Chylomicrons are released from enterocytes into the _____ for transport.
A. Blood
B. A chylomicron remnant
C. Are taken up by intestinal cells without the aid of micelles.
D. None of this
75: During digestion, _____ emulsify(ies) lipids.
A. Bile Acids
B. Monoglycerides and free fatty acids.
C. 0 trans
D. None of this
76: For cells that communicate by electrical synapses, the message travels between cells via ________.
A. Ions moving across the synaptic cleft
B. The diffusion of neurotransmitters
C. Gap junctions
D. Active transport across the synaptic cleft
E. Passive transport across the synaptic cleft
77: Hydrogen bonding is ultimately due to differences in _____ between two atoms.
A. Electronegativity
B. Phosphorus
C. Protons and neutrons
D. In the spherical orbital closest to the nucleus
78: Cooking oil and gasoline (a hydrocarbon) are not amphipathic molecules because they _____.
A. None of them dissolves in water
B. Is solid at room temperature
C. Do not have a polar or charged region
D. Are not soluble in water
E. As a component of animal cell membranes
79: Screening of the nuclear charge by core electrons in atoms is ________.
A. Cl
B. More efficient than that by valence electrons.
C. An acid
D. Cl-, F-
80: Glycerophospholipids can interact both with other lipids and water because they contain ________.
A. Saturated fatty acids
B. Double bonds
C. Polar regions and nonpolar regions
D. Cholesterol
E. Glycerol
81: Acids and bases denature a protein by disrupting ________.
A. Peptide bonds and salt bridges
B. Salt bridges and hydrogen bonds
C. Amide bonds and alkene bonds
D. Salt bridges and hydrophobic interactions
82: Alcohol is metabolized by the_________
A. Small intestine
B. Kidneys
C. Liver
D. Bladder
83: Histones have a large number of ________ residues.
A. Acidic
B. Aromatic
C. Basic
D. Polar uncharged
84: The assembly of glucose molecules into polysaccharides is a(n) _____ process.
A. Anabolic
B. Catabolic
C. Both of these (by self)
D. None of these (by seld)
85: The _____ store(s) more carbon than the atmosphere. trees soil oceans rock
A. OCEANS
B. Atmosphere
C. Carbon
D. None of thes
86: If digestion is ________, then synthesis is ________.
A. Hydrolysis; dehydration
B. Dehydration; hydrolysis
C. Organic; inorganic
D. Inorganic; organic
87: When ethylamine dissolves in water, a solution of __________ is produced.
A. Ammonia
B. Ethylammonium hydroxide
C. Ethylamine
D. Ethylhydroxide
88: Enzymes are produced only _________________________.
A. Outside the active cell
B. In the DNA of the cell
C. Within an active cell
D. In another cell and transported
89: The skeletal structure of palmitoleic acid is shown below. palmitoleic acid is a ________.
A. Monounsaturated fatty acid
B. Polyunsaturated fatty acid
C. Monosaturated fatty acid
D. Saturted fatty acid
90: The important cholesterol-based molecules are __________.
A. Steroids
B. Proteins.
C. Phospholipids.
D. Fatty acids.
91: The proper three-dimensional shape and folding of a protein is assisted by _________.
A. The nucleic acid strands in a DNA molecule are oriented antiparallel to each other.
B. Water molecules are produced as a polymer is formed from monomers
C. Molecules called chaperonins
D. Cellulose: structural component of plant cell walls
92: Anabolic steroids are appropriately prescribed to __________.
A. People who suffer from muscle-debilitating diseases
B. Overweight individuals who are not healthy enough for vigorous exercise
C. Athletes who need a competitive edge
D. Patients suffering from high blood cholesterol levels
93: Hemoglobin has a total of ________ protein chains in its quaternary structure.
A. One
B. Two
C. Three
D. Four
94: In a dehydration reaction, ________. in order for this to occur water is ________.
A. Monomers are joined to become a polymer; removed
B. Polymers are broken up to form monomers; added
C. Monomers are broken up to form polymers; added
D. Polymers are joined to form monomers; removed
95: In a dehydration synthesis reaction, __________ is always formed as a by-product of the reaction.
A. Galactose
B. Water
C. Acids
D. Lipids
96: Bioinformatics can be used to scan for short sequences that specify known mrnas, called _____.
A. Expressed sequence tags
B. Multigene families
C. Proteomes
D. Short tandem repeats
97: When cycling forward in a straight line, the knee is rotating about a(n) ____ axis.
A. Longitudinal
B. Vertical
C. Anteroposterior
D. Transverse
98: In the ionized form of an amino acid, the carboxylic acid end is ________.
A. Positively charged
B. Negatively charged
C. Neutral
D. Soluble in a nonpolar solvent
99: Regarding the models of cooperativity, _________.
A. These models, strictly speaking, only apply to tetramers.
B. T state is low affinity and R state is high affinity.
C. The concerted model and the sequential model are mutually exclusive.
D. The concerted model is based on the T state and the sequential on the R state.
100: The attractive forces that are important in the secondary structure of a protein are ________.
A. Amide bonds
B. Covalent bond
C. Disulfide bridges
D. Hydrogen bonds
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Biochemistry MCQs
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