Biochemistry

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Q. What is the structure of an antibody?
  • A. Single polypeptide chain
  • B. Two heavy and two light chains
  • C. Three heavy chains
  • D. Four light chains
Q. What is the structure of DNA commonly described as?
  • A. Single helix
  • B. Double helix
  • C. Triple helix
  • D. Linear strand
Q. What is the sugar component of RNA?
  • A. Deoxyribose
  • B. Ribose
  • C. Glucose
  • D. Fructose
Q. What is the term for the ability of antibodies to bind specifically to antigens?
  • A. Affinity
  • B. Specificity
  • C. Cross-reactivity
  • D. Neutralization
Q. What is the term for the specific region on an antigen that is recognized by an antibody?
  • A. Epitope
  • B. Paratope
  • C. Antibody site
  • D. Antigenic determinant
Q. What is the term for the specific region on an enzyme where the substrate binds?
  • A. Active site
  • B. Allosteric site
  • C. Binding pocket
  • D. Catalytic center
Q. What is the tertiary structure of a protein?
  • A. The overall 3D shape of a single polypeptide chain
  • B. The sequence of amino acids
  • C. The arrangement of multiple polypeptide chains
  • D. The interaction of the protein with other molecules
Q. What is the typical charge of DNA molecules during gel electrophoresis?
  • A. Positive
  • B. Negative
  • C. Neutral
  • D. Variable
Q. What is the typical length range of peptides?
  • A. 2 to 10 amino acids
  • B. 10 to 50 amino acids
  • C. 50 to 100 amino acids
  • D. Over 100 amino acids
Q. What is the typical mobile phase used in gas chromatography?
  • A. Liquid solvent
  • B. Gas
  • C. Solid adsorbent
  • D. Aqueous solution
Q. What is the typical number of cycles in a standard PCR protocol?
  • A. 5-10 cycles
  • B. 15-30 cycles
  • C. 25-40 cycles
  • D. 50-100 cycles
Q. What is the typical pressure range for HPLC systems?
  • A. 0-10 psi
  • B. 10-100 psi
  • C. 100-5000 psi
  • D. 5000-10000 psi
Q. What is the typical range of chemical shifts for protons in organic compounds?
  • A. 0-5 ppm
  • B. 0-10 ppm
  • C. 0-15 ppm
  • D. 0-20 ppm
Q. What is the typical range of wavelengths measured in FTIR spectroscopy?
  • A. 100-400 nm
  • B. 400-700 nm
  • C. 4000-400 cm-1
  • D. 700-1000 nm
Q. What is the typical temperature range for the column in gas chromatography?
  • A. 0-50°C
  • B. 50-300°C
  • C. 300-500°C
  • D. Above 500°C
Q. What mineral deficiency can lead to goiter?
  • A. Calcium
  • B. Iodine
  • C. Iron
  • D. Zinc
Q. What mineral helps regulate fluid balance in the body?
  • A. Chloride
  • B. Iron
  • C. Copper
  • D. Selenium
Q. What mineral is essential for the formation of hemoglobin?
  • A. Calcium
  • B. Iron
  • C. Zinc
  • D. Magnesium
Q. What mineral is known for its role in muscle contraction?
  • A. Sodium
  • B. Iron
  • C. Calcium
  • D. Phosphorus
Q. What mineral is primarily involved in energy metabolism?
  • A. Magnesium
  • B. Calcium
  • C. Iron
  • D. Sodium
Q. What property distinguishes polar amino acids from nonpolar amino acids?
  • A. Presence of a carboxyl group
  • B. Presence of a hydroxyl or amine group in the side chain
  • C. Presence of sulfur in the side chain
  • D. Presence of a benzene ring
Q. What role do antibodies play in the immune response?
  • A. Destroy pathogens directly
  • B. Neutralize toxins
  • C. Enhance phagocytosis
  • D. All of the above
Q. What role do chaperone proteins play in protein stability?
  • A. They degrade misfolded proteins
  • B. They assist in proper folding
  • C. They enhance enzymatic activity
  • D. They transport proteins
Q. What role do chaperone proteins play in protein structure?
  • A. They catalyze reactions
  • B. They assist in protein folding
  • C. They provide structural support
  • D. They transport proteins
Q. What role do kinases play in cell signaling?
  • A. They inhibit signaling pathways
  • B. They phosphorylate proteins
  • C. They transport molecules across membranes
  • D. They degrade signaling molecules
Q. What role do membrane proteins play in cellular functions?
  • A. Energy storage
  • B. Transport and signaling
  • C. Structural support
  • D. DNA replication
Q. What role do ribosomes play in protein synthesis?
  • A. They synthesize mRNA
  • B. They provide the site for translation
  • C. They replicate DNA
  • D. They splice introns from pre-mRNA
Q. What role do ribosomes play in the genetic code?
  • A. Transcription
  • B. Translation
  • C. Replication
  • D. Mutation
Q. What role do transcription factors play in gene expression?
  • A. They degrade RNA
  • B. They enhance or inhibit transcription
  • C. They replicate DNA
  • D. They splice RNA
Q. What role does cAMP play in the regulation of the lac operon?
  • A. It inhibits transcription
  • B. It enhances RNA polymerase binding
  • C. It degrades mRNA
  • D. It activates the repressor
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