Biology · Chemistry
Biomolecules and Enzymes
1,501 Questions
This topic focuses on biomolecules, specifically proteins, enzymes, and amino acids. It includes questions on enzyme structures, protein folding, and catalysis. These concepts are crucial for medical and biology competitive exams.
Enzyme catalysisProtein structuresAmino acid synthesisPolypeptide chainsBiomolecule properties
Biomolecules and Enzymes Questions
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cross-link proteins and nucleic acids
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break apart cell membranes
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are non-toxic
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degerm
A
Correct answer
Explanation
Aldehydes, such as glutaraldehyde and formaldehyde, act as disinfectants by cross-linking proteins and nucleic acids, which inactivates them.
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catalase
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lysozyme
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hydrogenase
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RNase
A
Correct answer
Explanation
Catalase is the enzyme that breaks down hydrogen peroxide into water and oxygen, protecting the cell from oxidative damage.
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Carbohydrate
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Protein
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Lipid
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Nucleic Acids
D
Correct answer
Explanation
DNA (deoxyribonucleic acid) is the universal genetic material for all known living organisms. It encodes the instructions for life.
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Carbohydrate
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Protein
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Lipid
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Nucleic Acid
B
Correct answer
Explanation
Proteins are polymers composed of amino acid monomers linked by peptide bonds. The sequence of these amino acids determines the protein's function.
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lipid
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globular
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nucleic acid
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bond
B
Correct answer
Explanation
Albumin is a globular protein, meaning it is folded into a compact, spherical shape. Globular proteins are typically water-soluble and perform various functional roles.
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bond
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globular
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protein
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lipid
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lipid
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nucleic acid
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protein
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carbohydrate
C
Correct answer
Explanation
Proteins are built from amino acids and are essential for maintaining cell structure (e.g., cytoskeleton) and function.
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nucleic acid
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lipid
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carbohydrate
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enzyme
D
Correct answer
Explanation
The suffix -ase is the standard naming convention for enzymes. Other biomolecules have different naming conventions, such as -ose for many carbohydrates.
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denatured
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protein
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fit
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polymerase
A
Correct answer
Explanation
When an enzyme loses its 3D structure due to heat, pH, or other factors, it is denatured. Denatured enzymes can no longer function because their active site shape is altered.
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denatured
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pH
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slows down
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active site
B
Correct answer
Explanation
The pH scale ranges from 0 to 14 and measures the acidity or alkalinity of a solution, which significantly impacts enzyme activity. The other options are either parts of an enzyme or outcomes of environmental stress.
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substrate
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enzyme
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active site
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denatured
C
Correct answer
Explanation
The active site is the specific region on an enzyme where substrate molecules bind and undergo a chemical reaction. It is shaped to fit specific substrates.
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lipids
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carbohydrates
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proteins
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nucleic acids
C
Correct answer
Explanation
Enzymes are specialized proteins that catalyze biological reactions. They are composed of amino acid chains folded into specific shapes.
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Brains
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Leg
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Backbone
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Extremity
C
Correct answer
Explanation
Carbon atoms form the structural framework or backbone of biological molecules like proteins, lipids, carbohydrates, and nucleic acids.
A
Correct answer
Explanation
A sol is a colloidal suspension of solid particles in a liquid, which is less viscous than a gel (the solid-like state).
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Pepsin
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Trypsin
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Chymotrypsin
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Chymotrypsinogen
D
Correct answer
Explanation
A zymogen is an inactive precursor of an enzyme. Chymotrypsinogen is the inactive form that is converted into the active enzyme chymotrypsin.