Biology - Biomolecules Quiz

Amino Acids and Proteins

• Amino acids are the monomers of proteins.
• Amino acids have a carboxyl group, and some may contain sulfur atoms.
• There are 21 amino acids, including Selenocysteine.
• The amino acids found in biological proteins are of L-configuration and are dextro or laevorotatory.
• Ornithine is a non-protein amino acid involved in urea biosynthesis, but it does not occur in proteins of biological systems.
• Amino acids can contain sulfur atoms, and Cysteine is a sulfur-containing amino acid.

Protein Structure and Function

• Covalent bonds are the strongest bonds.
• Hydrogen bonds and Van der Waals forces are weaker bonds that connect molecules.
• Hemoglobin has a lower affinity to oxygen than myoglobin.
• The iron in heme is linked to globin through Histidine.
• Oxygen dissociation curve of hemoglobin is shifted to the right by the Bohr effect.
• Frederick Sanger was the first to identify the structure of a protein, specifically Insulin.

pH and Buffers

• pH is not the negative log of the oxygen molecule concentration.
• pH 7.5 is a physiological pH.
• Antidiuretic hormone regulates water balance in the body.
• Vomiting can cause the stomach to become more acidic.

Enzymes and Folding

• Chaperone rescues proteins that have folded improperly and allows them to refold properly.
• Globular proteins have multiple folding of polypeptide chains, giving them an ellipsoidal shape.
• Allosteric enzymes have certain characteristics, and all of the above statements about them are true.
• Disulfide bonds can stabilize molecules.
• Beta sheets are not an example of a protein's tertiary structure.

Miscellaneous

• Lipids do not have amino acids as monomers.
• Collagen is the most abundant protein present in the human body.
• It is not true that the only difference between amino acids is the carboxyl group.