Biochemistry Quiz - Dive into the Chemistry of Living Organisms

Question 1 of 37

What is the primary structure of a protein?

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Alpha-helix

Beta-sheet

Amino acid sequence

Tertiary structure

Question 2 of 37

Which molecule is the primary energy carrier in cells?

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ADP

AMP

ATP

NADH

Question 3 of 37

Which of the following is NOT a component of nucleotides?

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Sugar

Phosphate group

Amino acid

Nitrogenous base

Question 4 of 37

Which enzyme is responsible for unwinding DNA during replication?

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DNA polymerase

Helicase

Ligase

Topoisomerase

Question 5 of 37

In which organelle does the citric acid cycle (Krebs cycle) occur?

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Nucleus

Mitochondria

Ribosome

Endoplasmic reticulum

Question 6 of 37

Which molecule is a common second messenger in signal transduction pathways?

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cAMP

ATP

NADPH

FADH2

Question 7 of 37

Which vitamin is essential for the synthesis of collagen?

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Vitamin A

Vitamin B12

Vitamin C

Vitamin D

Question 8 of 37

What type of bond holds together the two strands of a DNA double helix?

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Ionic bond

Hydrogen bond

Covalent bond

Disulfide bond

Question 9 of 37

Which metabolic pathway is responsible for breaking down glucose to produce energy?

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Gluconeogenesis

Glycolysis

Citric acid cycle

Electron transport chain

Question 10 of 37

Which type of RNA carries amino acids to the ribosome for protein synthesis?

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mRNA

rRNA

tRNA

snRNA

Question 11 of 37

Which structure is involved in the synthesis of lipids and detoxification?

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Rough endoplasmic reticulum

Smooth endoplasmic reticulum

Golgi apparatus

Lysosome

Question 12 of 37

What type of enzyme cuts DNA at specific sequences?

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DNA ligase

Restriction endonuclease

DNA polymerase

Helicase

Question 13 of 37

Which type of bond is found between amino acids in a protein?

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Hydrogen bond

Peptide bond

Disulfide bond

Ionic bond

Question 14 of 37

Which process converts glucose to pyruvate?

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Gluconeogenesis

Glycolysis

Fermentation

Oxidative phosphorylation

Question 15 of 37

Which molecule acts as a coenzyme in redox reactions?

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Vitamin C

ATP

NADH

FADH2

Question 16 of 37

Which process involves the synthesis of mRNA from a DNA template?

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Replication

Transcription

Translation

Post-translational modification

Question 17 of 37

Which component of the cell membrane is responsible for fluidity?

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Phospholipids

Proteins

Carbohydrates

Cholesterol

Question 18 of 37

Which enzyme is responsible for joining DNA fragments during replication?

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DNA polymerase

Ligase

Helicase

Topoisomerase

Question 19 of 37

Which type of lipid is the main component of cell membranes?

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Triglycerides

Phospholipids

Steroids

Waxes

Question 20 of 37

Which process is used to synthesize ATP in mitochondria?

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Glycolysis

Citric acid cycle

Oxidative phosphorylation

Fermentation

Question 21 of 37

What is the role of ribosomes in the cell?

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Energy production

Protein synthesis

DNA replication

Lipid metabolism

Question 22 of 37

Which enzyme breaks down hydrogen peroxide into water and oxygen?

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Catalase

Peroxidase

Oxidase

Superoxide dismutase

Question 23 of 37

Which sugar is used by the body for energy storage?

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Fructose

Glucose

Sucrose

Glycogen

Question 24 of 37

Which process describes the synthesis of glucose from non-carbohydrate sources?

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Glycolysis

Gluconeogenesis

Glycogenolysis

Fermentation

Question 25 of 37

Which molecule is a precursor to all steroid hormones?

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Cholesterol

Glucose

Amino acids

Fatty acids

Question 26 of 37

Which term describes the complete set of proteins expressed by a genome?

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Proteome

Genome

Transcriptome

Metabolome

Question 27 of 37

What is the function of ATP synthase?

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DNA replication

ATP production

Protein synthesis

Lipid synthesis

Question 28 of 37

Which type of bond is crucial for stabilizing the secondary structure of proteins?

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Ionic bond

Hydrogen bond

Peptide bond

Disulfide bond

Question 29 of 37

Which protein structure refers to the overall three-dimensional shape of a polypeptide?

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Primary structure

Secondary structure

Tertiary structure

Quaternary structure

Question 30 of 37

Which process converts RNA into protein?

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Replication

Transcription

Translation

Splicing

Question 31 of 37

Which enzyme catalyzes the formation of a peptide bond between amino acids?

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Ribosome

DNA polymerase

RNA polymerase

Ligase

Question 32 of 37

Which class of biomolecules includes enzymes and antibodies?

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Carbohydrates

Proteins

Nucleic acids

Lipids

Question 33 of 37

Which term describes the study of biochemical processes involving carbohydrates?

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Lipidomics

Proteomics

Glycomics

Metabolomics

Question 34 of 37

Which coenzyme is involved in transferring acyl groups?

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NADH

FADH2

Coenzyme A

Biotin

Question 35 of 37

Which type of lipid is primarily responsible for forming cell membranes and lipid bilayers?

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Triglycerides

Phospholipids

Steroids

Waxes

Question 36 of 37

Which of the following is a non-covalent interaction that stabilizes protein structure?

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Disulfide bonds

Ionic bonds

Covalent bonds

Peptide bonds

Question 37 of 37

What is the main function of the Golgi apparatus?

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Protein synthesis

Lipid synthesis

Protein modification and packaging

Energy production

Biochemistry : Chemistry

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