Biomolecules and Enzymes: False Statements

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False Statements on Biomolecules and Enzymes

• Lipids are not composed of fatty acids and amino acids as monomers.

• Tetrameric proteins do not consist of two polypeptide chains.

• The difference between amino acids is not limited to the carboxyl group.

• Peptide bonds do not stabilize the secondary structure of a protein.

• Not all proteins can be renatured after denaturation.

• Beta sheets are not examples of a protein's tertiary structure.

• The T form of hemoglobin does not have a high affinity for oxygen.

• Collagen is not the dominant globular protein in humans.

• Ehlers-Danlos syndrome is not caused by a mutation in the elastin gene.

• Nucleases do not catalyze the hydrolysis of proteins into their component amino acids.

• Reaction velocity does not always increase with increasing substrate concentration.

• Competitive inhibitors do not decrease the Km for the substrate.

• Non-competitive inhibitors do not bind to the active site of an enzyme.

• Biotin aids different reactions to hydroxylation of lysine and proline residues in collagen synthesis.

• Competitive inhibitors do not resemble the structure of an enzyme.

• Rhodopsin does not contain Vitamin E protein opsin.

• The parathyroid and adrenal glands do not play a significant role in plasma calcium maintenance.

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True Statements on Biomolecules and Enzymes

• Acids donate hydrogen ions in water, while bases accept them.
• In the lungs, high oxygen concentrations saturate hemoglobin.
• Some amino acids contain sulfur atoms.
• Enzymes remain unchanged after participating in a reaction.
• Pellagra can be caused by niacin deficiency.
• Chronic alcoholism can cause severe thiamine deficiency.
• At equilibrium, ΔG is zero, indicating no net change in the system.
• Exergonic reactions are also exothermic.
• Amino acids are the monomers of proteins.
• A patient with a serum pH of 7.7 has alkalosis.
• Both L and D amino acids are present in humans
• Chaperones help improperly folded proteins refold correctly.
• Globular proteins are ellipsoidal due to multiple polypeptide chain folding.
• Iron moves towards the heme plane when O2 binds.
• Fetuses and adults have different types of hemoglobin chains.
• Hemoglobin heme typically contains iron in the ferrous state (Fe2+).
• Enzymes lower activation energy by stabilizing the transition state.
• Vitamins B9, cobalamin, niacin, and C are water-soluble.

Identify false statements about biomolecules and enzymes. Topics covered include lipids, proteins, hemoglobin, collagen, enzyme inhibition, and reaction kinetics. Test your understanding of molecular biology.