All Free Biochemistry MCQs with Answers

• A. Translation
• B. Mutation
• C. Transcription
• D. Conjugation

Explanation: Translation is the stage in which ribosomes read the codons of messenger RNA and assemble the corresponding amino acid sequence into a…

• A. Glutamine
• B. Glycine
• C. Glutamic acid
• D. Lysine

Explanation: Glycine combines with succinyl-CoA in the first committed step of haem synthesis to form δ-aminolevulinate.

• A. Protein foldingConsult A Nutritionist
• B. Electron transport chain
• C. Transport of ATP
• D. Intracellular proteolysis

Explanation: Ubiquitin is attached to selected proteins, marking them for degradation by the 26S proteasome and thereby supporting intracellular…

• A. Collagen
• B. Albumin
• C. Globulin
• D. Hemoglobin

Explanation: Collagen is the most abundant protein in the human body because it forms the main structural framework of skin, bone, cartilage, tendons…

• A. Phenyl alanine
• B. Tyrosine
• C. Tryptophan
• D. None of the above

Explanation: Tyrosine is converted to catecholamines, including adrenaline, and is also incorporated into thyroxine produced by the thyroid gland.

• A. Epinephrine
• B. Dopamine
• C. Tyrosine
• D. Phenylalanine

Explanation: Dopamine is hydroxylated by dopamine beta-hydroxylase to form norepinephrine.

• A. Decreased rate of glucose uptake by cells
• B. Lipolysis
• C. Gluconeogenesis
• D. Deposition of chondroitin sulfate

Explanation: Somatomedin, mainly IGF-1, mediates growth hormone effects on cartilage by promoting matrix formation, including deposition of chondroitin…

• A. Rhodopsin
• B. Laminin
• C. Eutactin
• D. nidogen

Explanation: Nidogen, laminin and eutactin are basement-membrane components involved in its structural organization.

• A. Unfolding occurs
• B. Biological activity is retained
• C. Sequence of amino acids remain the same
• D. Disruption of secondary structure occurs

Explanation: Denaturation unfolds a protein and disrupts its secondary and higher-order structures, while usually leaving the amino-acid sequence…

• A. E - Cadherins
• B. Fibronectin
• C. Laminin
• D. Tenascin

Explanation: Laminin is a major basement-membrane glycoprotein with domains that bind extracellular-matrix components and cell-surface receptors such…

• A. Albumin
• B. Fibrinogen
• C. Globulin
• D. Prothrombin

Explanation: Albumin is the most abundant plasma protein and the main contributor to colloidal osmotic, or oncotic, pressure because it is plentiful…

• A. 6 gms
• B. 60 gms
• C. 120 gms
• D. 250 gms

Explanation: An adult generally requires about 0.8 g of protein per kilogram of body weight daily, which is approximately 50 to 60 g for an average…

• A. Beta Globulin
• B. Alpha 1 globulin
• C. Albumin
• D. Gamma Globulin

Explanation: Albumin migrates fastest toward the anode during serum protein electrophoresis because it has a high net negative charge and small size.

• A. Denatured state
• B. Molecular aggregation
• C. Precipitation
• D. Quaternary structure

Explanation: Quaternary structure describes the association of two or more folded protein subunits, which may be identical or different.

• A. Histone
• B. Collagen
• C. Hyaluronic acid binding protein
• D. FibrinogenOrder DNA Kits

Explanation: Histones are basic proteins rich in lysine and arginine, allowing them to bind negatively charged DNA and package it into chromosomes.

• A. Alanine
• B. Tryptophan
• C. Tyrosine
• D. Leucine

Explanation: Tyrosine is the precursor of both thyroid hormones, including thyroxine, and catecholamines such as dopamine, noradrenaline and…

• A. Ornithine
• B. Glutamine
• C. Phenylalanine
• D. Tryptophan

Explanation: Hartnup disease impairs intestinal and renal transport of neutral amino acids, especially tryptophan, so tryptophan is lost in urine.

• A. Ferric ions
• B. Vinyl groups
• C. Histidine
• D. Pyrrole rings

Explanation: Hemoglobin contains ferrous iron, Fe2+, within heme, not ferric iron, Fe3+.

• A. Alanine
• B. Glycine
• C. Histidine
• D. Leucine

Explanation: Heme synthesis begins when glycine combines with succinyl-CoA to form aminolevulinate, which ultimately leads to protoporphyrin IX.

• A. Pyridine nucleotides
• B. Riboflavin containing nucleotides
• C. Metal containing flavoproteins
• D. Iron-porphyrin proteinsConsult A Nutritionist

Explanation: Cytochromes are electron-transfer proteins containing a heme group, so they are iron-porphyrin proteins.