MCQOPTIONS
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MCQOPTIONS
This section includes 226 Mcqs, each offering curated multiple-choice questions to sharpen your Biochemistry knowledge and support exam preparation. Choose a topic below to get started.
| 201. |
A very important group of compounds which contain an amino group and the carboxylic group is called |
| A. | amines |
| B. | amides |
| C. | amino acids |
| D. | none of above |
| Answer» D. none of above | |
| 202. |
What radioactive molecule is used to end-label an oligonucleotide? |
| A. | (alpha)-³²P-ATP |
| B. | (alpha)-³²P-dUTP |
| C. | (gamma)-³²P-ATP |
| D. | Any of these |
| Answer» D. Any of these | |
| 203. |
By refluxing excess sodium hydroxide (NaOH), the salts produced will be of |
| A. | 2-amino carboxylic acids |
| B. | amino ethanoic acid |
| C. | diol acids |
| D. | dioxyl alcohols |
| Answer» B. amino ethanoic acid | |
| 204. |
DNA- footprinting is a suitable technique for identifying which of the following? |
| A. | Particular mRNA in mixture |
| B. | Particular t-RNA in mixture |
| C. | Introns within DNA |
| D. | Protein binding site within DNA |
| Answer» E. | |
| 205. |
Molecules that bear charged groups of opposite polarity are known as |
| A. | zwitterions |
| B. | ambions |
| C. | ion conversion |
| D. | amphions |
| Answer» B. ambions | |
| 206. |
Mobile phase can be ___________ |
| A. | Only solid |
| B. | Only gas |
| C. | Solid or liquid |
| D. | Liquid or gas |
| Answer» E. | |
| 207. |
A link between amino acid molecules in a polypeptide chain by condensation reaction is called |
| A. | peptide bond |
| B. | poly peptide linkage |
| C. | diol linkage |
| D. | amine linkage |
| Answer» B. poly peptide linkage | |
| 208. |
What is the heaviest of the twenty amino acids? |
| A. | Phenylalanine |
| B. | Tryptophan |
| C. | Tyrosine |
| D. | Histidine |
| Answer» C. Tyrosine | |
| 209. |
Non-polar side chains in amino acids include |
| A. | Ala |
| B. | Ser |
| C. | Asp |
| D. | Lys |
| Answer» B. Ser | |
| 210. |
In acidic solutions, amino acids become |
| A. | positively charged |
| B. | negatively charged |
| C. | pH of 7 |
| D. | alkaline |
| Answer» B. negatively charged | |
| 211. |
An amino acid that yields acetoacetyl CoA during the catabolism of its carbon skeleton will be considered as __________ |
| A. | Glycogenic |
| B. | Ketogenic |
| C. | Both glycogenic and ketogenic |
| D. | Essential |
| Answer» C. Both glycogenic and ketogenic | |
| 212. |
Identify the wrong statement. |
| A. | Hemoglobin is a globular protein |
| B. | Hemoglobin is a fibrous protein |
| C. | Fibrous proteins are insoluble in water |
| D. | Collagen is a fibrous protein |
| Answer» C. Fibrous proteins are insoluble in water | |
| 213. |
Proteins separation can be carried out on the basis of |
| A. | net charge |
| B. | solubility in salt solutions |
| C. | size or mass |
| D. | all of these |
| Answer» E. | |
| 214. |
Which of the following forces is the most unfavorable for protein folding? |
| A. | Conformational entropy |
| B. | Hydrophobic interactions |
| C. | Vander Waals interactions |
| D. | Electrostatic interactions |
| Answer» B. Hydrophobic interactions | |
| 215. |
The amino acids which we obtain from food and our bodies are unable to build them are |
| A. | twenty |
| B. | forty |
| C. | twelve |
| D. | eight |
| Answer» E. | |
| 216. |
What was the first protein whose complete tertiary structure was determined? |
| A. | Lysozyme |
| B. | Myoglobin |
| C. | Pancreatic ribonuclease |
| D. | Pancreatic DNase |
| Answer» C. Pancreatic ribonuclease | |
| 217. |
Marfan's syndrome is thought to be a mutation affecting |
| A. | hemoglobin synthesis |
| B. | collagen synthesis |
| C. | metabolism of homogentisic acid |
| D. | insufficient thyroid production |
| Answer» C. metabolism of homogentisic acid | |
| 218. |
Cyclins are proteins that |
| A. | regulate ability of cells to invade tissue |
| B. | regulate passage from one stage of cell division to another |
| C. | regulate apoptosis of damaged cells |
| D. | none of the above |
| Answer» C. regulate apoptosis of damaged cells | |
| 219. |
During successful purification scheme, this may be expected that the |
| A. | specific activity increases |
| B. | specific activity decreases |
| C. | number of proteins in the sample decreases |
| D. | both (a) and (c) |
| Answer» E. | |
| 220. |
Electrophoresis of histones and myoglobin under non-denaturing conditions (pH = 7.0) results in |
| A. | both proteins migrate to the anode |
| B. | histones migrate to the anode and myoglobin migrates to the cathode |
| C. | histones migrate to the cathode and myoglobin migrates to the anode |
| D. | both proteins migrate to the cathode |
| Answer» D. both proteins migrate to the cathode | |
| 221. |
Which of the following statement is incorrect? |
| A. | Hemoglobin and myoglobin are the two oxygen binding proteins |
| B. | Hemoglobin transports O₂ in the blood |
| C. | Myoglobin stores O₂ in muscles |
| D. | None of the above |
| Answer» E. | |
| 222. |
What is the end product of leucine metabolism? |
| A. | Acetyl-CoA |
| B. | Pyruvic acid |
| C. | Oxaloacetic acid |
| D. | Acetyl carnitine |
| Answer» B. Pyruvic acid | |
| 223. |
When the amino acid alanine (R-group is CH₃) is added to a solution with a pH of 7.3, alanine becomes |
| A. | a cation |
| B. | nonpolar |
| C. | a zwitterions |
| D. | an isotope |
| Answer» D. an isotope | |
| 224. |
Which amino acid when exposed to ninhydrin produces a brown color? |
| A. | Asparagine |
| B. | Proline |
| C. | Alanine |
| D. | Valine |
| Answer» B. Proline | |
| 225. |
Coomassie Blue stains the proteins by reacting with |
| A. | arginine residues |
| B. | free c-termini |
| C. | peptide bonds |
| D. | aromatic ring |
| Answer» B. free c-termini | |
| 226. |
The α-amino acids have a carboxyl group with a pK around __________ , and an amino group with a pK near __________ . |
| A. | 1.1, and 12.1 |
| B. | 6.5, and 8.0 |
| C. | 3.3, and 10.5 |
| D. | 2.2, and 9.4 |
| Answer» E. | |