8.The only imino acid a. Gly b. Cys c. Lys d. Pro
Kindly answer questions 8, 9 and 10. Put the letter of the answer.
1. Which of the following statements is accurate regarding these protein structures?
a. Proteins in a quaternary structure consist of a simple polypeptide chain.
b. Interactions between the R groups in amino acids form tertiary structure.
c. Secondary structures are formed by multiple polypeptide chains.
d. The two types of primary structure are α- helices and β- pleated sheets.
2. What type of bonds are formed between amino acids?
a. Peptide bond
b. Glycosidic linkage
c. Hydrogen bonds
d. Ester linkages
3. Which of the following is an example of protein denaturation?
a. Amino acids fold into repeating patterns due to hydrogen bonding of the peptide backbone.
b. Several amino acids are joined together via peptide bonds.
c. A protein binds with a substrate, lowering the activation energy of a reaction.
d. A protein is exposed to extremely high heat, causing it to lose its secondary structure and be left with only its primary structure.
4. A new drug is developed which selectively cleaves covalent bonds between two sulfur atoms of non-adjacent amino acids in a polypeptide chain. Which level of protein structure in affected molecules would be most directly affected by the drug?
a. Primary
b. Secondary
c. Tertiary
d. Quaternary
5. What are molecular chaperones?
a. Enzymes
b. Cell mass
c. Tumor
d. Helper proteins
6. Chaperones binds to which type of amino acids?
a. Polar basic
b. Polar acidic
c. Hydrophobic
d. Hydrophilic neutral
7. Which set of the following amino acids are all polar?
a. W K Q
b. H M N
c. T N Y
d. M T C
e. P C S
8.The only imino acid
a. Gly
b. Cys
c. Lys
d. Pro
9. Dopamine, norepinephrine and epinephrine are collectively called catecholamines. Which of the following amino acids serves as a precursor in the synthesis of these catecholamines?
a. W
b. T
c. Y
d. R
10. Debie just gave birth to a healthy baby. However, she was having hard time secreting milk. Which of these small peptide hormone is associated in low level with Debie’s condition.
a. Enkephalins
b. Vasopressin
c. Oxytocin
d. Both A & B
11. A mother went to a drugstore to purchase a vitamin supplement for her baby. She found out from the pharmacist that the vitamins contain an amino acid that can help in the absorption of calcium which is helpful for the bone development of her child. What particular amino acid is present?
a. Methionine
b. Lysine
c. Arginine
d. Phenylalanine
12. This protein that is involve in immune system responses is measured to check to individuals who were suspected or have been exposed to Covid-19 infections.
a. Insulin
b. Myoglobin
c. Transferrin
d. Immunoglobulins
13. The 22nd amino acid and the only amino acid
a. Selenocysteine
b. Selenicysteine
c. Carbocysteine
d. Pyrrolysine
14. Ser+thr+tyr will engage this specific interaction
a. Hydrogen Bonding
b. Disulfide Bonds
c. Non-Polar Hydrophobic
d. Salt Bridges
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