Quests and answers collected in class

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Biomolecules – Domande proposte durante le lezioni – A.A. 2019/2020 DOMANDE 20/09/19 -pH degli acidi <7 -Free Gibbs energy reazione endoergonica >0 -buffer solution formata da acido + base coniugata -buffer solution ha sempre un pH fisso DOMANDE 24/09/19 1. the zwitterion state of amino acid shows only one negative charge in carboxyl group FALSE, because there is a balance of positive and negative charges, so the final charge in equal to zero. 2. Peptide bond is a strong chemical bond between 2 amino acids (AAs). TRUE 3. The side chains of AAs are in cis position due to resonance present in peptide bond. FALSE, the peptide bond has a partial double bond due to resonance 4. Aliphatic AAs are characterized by: A. Hydroxyl group in side chains B. C and H atom s in side chains C. Carboxyl group in side chains 5. Aas with -OH and amide grops in side chains perform: A. Hydrophobic interaction B. Hydrogen bond C. Weak interactions controlled by polarity The first is false because if I have a polar aminoacid it could only interact with hydrophilic AAs! 6. Acid AAs contain phosphoric group in side chain FALSE 7. Acid AAs are characterized by a possible negative charge in side chain TRUE 8. Acid AAS perform electrostatic interactions with positively charged compounds. TRUE DOMAND E 01/10/19 1. Cysteine performs A. H bonds with another cysteine. B. Covalent bond with another cysteine. C. Disulfide bridge with another cysteine. 2. Primary structure of a protein A. Is the result of polypeptide chain’s arrangement without considering the residues conformations. B. Is the amino acids sequence forming polypeptide chain. C. Is the result of polypeptide chain’s arrangement, considering the residues conformations. 3. Secundary structure of a protein A. Is the result of polypeptide…