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Biochemistry : Chemistry
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Practice Test
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Question 1 of 37
What is the primary structure of a protein?
Choose 1 answer
Alpha-helix
Beta-sheet
Amino acid sequence
Tertiary structure
Question 2 of 37
Which molecule is the primary energy carrier in cells?
Choose 1 answer
ADP
AMP
ATP
NADH
Question 3 of 37
Which of the following is NOT a component of nucleotides?
Choose 1 answer
Sugar
Phosphate group
Amino acid
Nitrogenous base
Question 4 of 37
Which enzyme is responsible for unwinding DNA during replication?
Choose 1 answer
DNA polymerase
Helicase
Ligase
Topoisomerase
Question 5 of 37
In which organelle does the citric acid cycle (Krebs cycle) occur?
Choose 1 answer
Nucleus
Mitochondria
Ribosome
Endoplasmic reticulum
Question 6 of 37
Which molecule is a common second messenger in signal transduction pathways?
Choose 1 answer
cAMP
ATP
NADPH
FADH2
Question 7 of 37
Which vitamin is essential for the synthesis of collagen?
Choose 1 answer
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?
Choose 1 answer
Ionic bond
Hydrogen bond
Covalent bond
Disulfide bond
Question 9 of 37
Which metabolic pathway is responsible for breaking down glucose to produce energy?
Choose 1 answer
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?
Choose 1 answer
mRNA
rRNA
tRNA
snRNA
Question 11 of 37
Which structure is involved in the synthesis of lipids and detoxification?
Choose 1 answer
Rough endoplasmic reticulum
Smooth endoplasmic reticulum
Golgi apparatus
Lysosome
Question 12 of 37
What type of enzyme cuts DNA at specific sequences?
Choose 1 answer
DNA ligase
Restriction endonuclease
DNA polymerase
Helicase
Question 13 of 37
Which type of bond is found between amino acids in a protein?
Choose 1 answer
Hydrogen bond
Peptide bond
Disulfide bond
Ionic bond
Question 14 of 37
Which process converts glucose to pyruvate?
Choose 1 answer
Gluconeogenesis
Glycolysis
Fermentation
Oxidative phosphorylation
Question 15 of 37
Which molecule acts as a coenzyme in redox reactions?
Choose 1 answer
Vitamin C
ATP
NADH
FADH2
Question 16 of 37
Which process involves the synthesis of mRNA from a DNA template?
Choose 1 answer
Replication
Transcription
Translation
Post-translational modification
Question 17 of 37
Which component of the cell membrane is responsible for fluidity?
Choose 1 answer
Phospholipids
Proteins
Carbohydrates
Cholesterol
Question 18 of 37
Which enzyme is responsible for joining DNA fragments during replication?
Choose 1 answer
DNA polymerase
Ligase
Helicase
Topoisomerase
Question 19 of 37
Which type of lipid is the main component of cell membranes?
Choose 1 answer
Triglycerides
Phospholipids
Steroids
Waxes
Question 20 of 37
Which process is used to synthesize ATP in mitochondria?
Choose 1 answer
Glycolysis
Citric acid cycle
Oxidative phosphorylation
Fermentation
Question 21 of 37
What is the role of ribosomes in the cell?
Choose 1 answer
Energy production
Protein synthesis
DNA replication
Lipid metabolism
Question 22 of 37
Which enzyme breaks down hydrogen peroxide into water and oxygen?
Choose 1 answer
Catalase
Peroxidase
Oxidase
Superoxide dismutase
Question 23 of 37
Which sugar is used by the body for energy storage?
Choose 1 answer
Fructose
Glucose
Sucrose
Glycogen
Question 24 of 37
Which process describes the synthesis of glucose from non-carbohydrate sources?
Choose 1 answer
Glycolysis
Gluconeogenesis
Glycogenolysis
Fermentation
Question 25 of 37
Which molecule is a precursor to all steroid hormones?
Choose 1 answer
Cholesterol
Glucose
Amino acids
Fatty acids
Question 26 of 37
Which term describes the complete set of proteins expressed by a genome?
Choose 1 answer
Proteome
Genome
Transcriptome
Metabolome
Question 27 of 37
What is the function of ATP synthase?
Choose 1 answer
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?
Choose 1 answer
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?
Choose 1 answer
Primary structure
Secondary structure
Tertiary structure
Quaternary structure
Question 30 of 37
Which process converts RNA into protein?
Choose 1 answer
Replication
Transcription
Translation
Splicing
Question 31 of 37
Which enzyme catalyzes the formation of a peptide bond between amino acids?
Choose 1 answer
Ribosome
DNA polymerase
RNA polymerase
Ligase
Question 32 of 37
Which class of biomolecules includes enzymes and antibodies?
Choose 1 answer
Carbohydrates
Proteins
Nucleic acids
Lipids
Question 33 of 37
Which term describes the study of biochemical processes involving carbohydrates?
Choose 1 answer
Lipidomics
Proteomics
Glycomics
Metabolomics
Question 34 of 37
Which coenzyme is involved in transferring acyl groups?
Choose 1 answer
NADH
FADH2
Coenzyme A
Biotin
Question 35 of 37
Which type of lipid is primarily responsible for forming cell membranes and lipid bilayers?
Choose 1 answer
Triglycerides
Phospholipids
Steroids
Waxes
Question 36 of 37
Which of the following is a non-covalent interaction that stabilizes protein structure?
Choose 1 answer
Disulfide bonds
Ionic bonds
Covalent bonds
Peptide bonds
Question 37 of 37
What is the main function of the Golgi apparatus?
Choose 1 answer
Protein synthesis
Lipid synthesis
Protein modification and packaging
Energy production
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