All Free Biology MCQs with Answers
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19844 questions · page 526 of 1985
5251. Liver cells are infected with retrovirus containing normal gene for the receptor for the treatment of:
- A. SCIDS
- B. Cystic fibrosis
- C. Hypercholesterolemia
- D. Cardiovascular disorder
Explanation: In this gene therapy, liver cells are infected with a retrovirus carrying the normal LDL receptor gene. This helps remove excess LDL cholesterol from the blood
Correct answer: Hypercholesterolemia5252. For the treatment of SCIDS, bone marrow stem cells are removed from the blood and are infected with a:
- A. Bacteriophage
- B. Retrovirus
- C. Lambda virus
- D. Bacterium
Explanation: The retrovirus acts as a vector for gene therapy.
Correct answer: Retrovirus5253. The high levels of cholesterol make a patient subject to:
- A. Fatal heart attack at old age
- B. A curable heart attack at old age
- C. A curable heart attack at young age
- D. Fatal heart attack at young age
Explanation: High levels of cholesterol especially LDL can lead to early atherosclerosis, which increases the risk of a fatal heart attack at a young age.
Correct answer: Fatal heart attack at young age5254. There are two main methods used for gene therapy i.e:
- A. Ex - vivo and in vivo
- B. Ex vivo - Ex vitro
- C. Ex - vivo and in vitro
- D. In vitro - Ex vitro
Explanation: In ex-vivo method cells or tissurs are taken out of the body and after insersion of normal genes they are implanted in the body. However, in in-vivo method gene/genes is/are inserted into the cells or at their original site in the body.
Correct answer: Ex - vivo and in vivo5255. Gene therapy includes procedures that give a patient healthy genes to make up for faulty genes to treat various human illnesses such as:
- A. Cancer
- B. Cardiovascular diseases
- C. Cancer and cardiovascular diseases
- D. Tetanus
Explanation: Gene therapy involves introducing healthy genes into a patient's cells to replace or repair faulty genes, helping treat serious illnesses like cancer and cardiovascular diseases.
Correct answer: Cancer and cardiovascular diseases5256. Urine is preferable vehicle for a biotechnology product than milk because of following reasons, EXCEPT:
- A. Only females produce milk
- B. Females don't produce milk until maturity
- C. Each animal urinates throughout life
- D. It is easier to extract proteins from urine than from milk
Explanation: Urine is preferred because both sexes produce it throughout life, unlike milk, but extracting proteins from urine is actually. harder than from milk.
Correct answer: It is easier to extract proteins from urine than from milk5257. A goat is genetically engineered to produce _, which is secreted in her milk.
- A. Prothrombin
- B. Antithrombin-III
- C. Heparin
- D. Fibrin
Explanation: It is an anti-clotting factor used in microsurgeries to discourage formation of clot at site of surgery.
Correct answer: Antithrombin-III5258. The scientists of United States Department of Agriculture have been able to genetically engineer _ to produce human growth hormone in their urine, instead of in milk.
- A. Cows
- B. Goats
- C. Mice
- D. Squirrels
Explanation: The scientists of United States Department of Agriculture have been able to genetically engineer mice to produce human growth hormone in their urine, instead of in milk.
Correct answer: Mice5259. An animal developed from an egg, having foreign gene inserted in it is called:
- A. Transgenic animal
- B. Transgender animal
- C. Clone
- D. Transsexual animal
Explanation: A transgenic animal is the one which has a foreign gene inserted in it.
Correct answer: Transgenic animal5260. Genetically engineered fishes are now being kept in ponds, that offer:
- A. No escape to the wild
- B. Mutualistic help to the wild
- C. Easy escape to the wild
- D. Symbiotic help to the wild
Explanation: Due to their massive size and more vigour the wild flora fall easy prey to them.
Correct answer: No escape to the wild