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Practice questions-set-4
- January 30, 2020
- Posted by: Namrata Chhabra
- Category: Practice questions
Q.1-The pH of the body fluids is stabilized by buffer systems. Which of the following buffers is the most effective buffer system at physiological pH? Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
a) Bicarbonate buffer
b) Phosphate buffer
c) Protein buffer
d) Deoxy hemoglobin
Q.2-Which of the following laboratory results below indicates compensated metabolic alkalosis?                                                                                                          Â
a) Low p CO2, normal bicarbonate and, high pH
b) Low p CO2, low bicarbonate, low pH
c) High p CO2, normal bicarbonate and, low p H
d) High pCO2, high bicarbonate, High pH.
Q.3– Which of the following has the highest glycemic index?                            Â
a) Ice cream
b) Cucumber
c) Bread
d) Dextrose
Q.4-In diabetes mellitus there is reduced oxidation of carbohydrates; what will the effect of insulin administration on RQ?                                                                         Â
a) It will increase                       Â
b) It will decrease
c) No effect
d) Initial rise and then fall
Q.5-Which of the following nutrients is rich in short and medium-chain fatty acids? Â
a) Milk
b) Peanut oil
c) Sunflower oil
d) Almond oil
Q.6- A woman’s risk for developing breast cancer is greatest with:                  Â
a) Family history of breast cancer and a history of taking hormone replacement therapy
b) Early age at menarche and late age of first parity
c) A family history of breast cancer and a history of benign breast disease
d) A BRCA1or BRCA2
Q.7-Reduction of the 2′-hydroxyl of purine and pyrimidine Ribonucleotides, catalyzed by-
a) Thioredoxin reductase
b) Ribonucleotide reductase
c) Dihydrofolate reductase
d) Oxidoreductase.
Q.8- The human brain has a low level of which of the following enzymes?              Â
a) PRPP synthetase
b) Amidotransferase
c) HGPRT
d) Adenosine deaminase
Q.9- The fragments of newly synthesized DNA are sealed by enzymes referred to as –
a) Restriction endonucleases                       Â
b) Topoisomerases
c) Telomerase
d) DNA ligases.
Q.10- In animal cells, including human cells, the replication of the DNA genome occurs only at a specified time during the life span of the cell. This period is referred to as the
a) gap 1(G1)
b) gap 2(G2)
c) M phase
d) S phase.
Q.11- The derepression of the lac operon in the presence of lactose is an example of-Â Â Â Â Â Â Â Â Â Â Â
a) Positive regulation
b) Negative regulation
c) Double negative regulation
d) Double positive regulation.
Q.12- The operator locus is a region of double-stranded DNA-Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
a) To bind RNA polymerase
b) To bind lac repressor
c) To bind CAP-cAMP complex
d) To bind transcription factors
Q.13- Which of the following is not a stop codon in prokaryotes?            Â
a) UAA
b) UAG
c) UGG
d) UGA
Q.14- The ideal support medium for separation of nucleic acids is-Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
a) Starch gel
b) Cellulose acetate
c) Agarose gel
d) Filter paper
Q.15- The drug Aspirin is detoxified by-Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
a) Methylation
b) Acetylation
c) Hydrolysis
d) Glucuronidation
Q.16- Which of the following enzymes is not a tumor marker?                                 Â
a) Alkaline phosphatase
b) Acid phosphatase
c) Lactate dehydrogenase
d) Acid maltase
Q.17- DNA is assembled into nucleosomes with the help of special proteins called-
a) Prolamines           Â
b) Histones
c) Chaperones
d) Protamines
Q.18- Burkitt’s lymphoma is caused by-                                                                     Â
a) Adenovirus
b) Human Papillomavirus
c) Hepatitis B virus
d) Epstein–Barr virus
Q.19- Which drug out of the following is not an anticancer drug?     Â
a) Azaserine
b) Allopurinol
c) Cytosine arabinoside                       Â
d) Mercaptopurine.
Q.20- Which of the following is not a true mechanism for the conversion of proto-oncogenes to oncogenes?                                                                                        Â
a) Point mutation
b) Chromosomal translocation
c) Insertional mutagenesis
d) Histone acetylation
Key to answers-
1)-a,2)-d,3)-d,4)-a,5)-a,6)-d,7)-b,8)-b,9)-d,10)-d,11)-c,12)-b,13)-c,14)-c,15)-c,16)-d,17)-b,18)-d,19)-b,20)-d
Author:Namrata Chhabra

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