All Free Biology MCQs with Answers
Every Biology question in the bank, across all chapters, each with the correct answer and a written explanation. Free and unlimited, with no account needed.
19844 questions · page 536 of 1985
5351. Biodegradable plastic is obtained from:
- A. Yeast
- B. Mouse eared cress
- C. Bacteria
- D. Bioreactors
Explanation: A weed called mouse-eared cress has been engineered to produce a biodegradable plastic (polyhydroxy-butyrate) in cell granules.
Correct answer: Mouse eared cress5352. The antibody which can deliver radio-isotopes to tumor cells is obtained from:
- A. Yeast
- B. Weed
- C. Corn
- D. Wheat
Explanation: One type of antibody made by corn can deliver radioisotopes to tumor cells and another made by soybeans can be used as a treatment for genital herpes clinical trials have begun.
Correct answer: Corn5353. The antibody which is used for the treatment of genital herpes is obtained from:
- A. Yeast
- B. Soya bean
- C. Corn
- D. Wheat
Explanation: One type of antibody made by com can deliver radioisotopes to tumor cells and another made by soybeans can be used as a treatment for genital herpes clinical traits have begun.
Correct answer: Soya bean5354. Gene pharming is used for obtaining:
- A. Milk
- B. Meat
- C. Antibodies
- D. Drugs
Explanation: Gene pharming, the' use of transgenic farm animals to produce pharmaceuticals, is being pursued by a number of firms. Genes that code for therapeutic, and diagnostic proteins are incorporated into the animal's DNA, and the proteins appear in the animal's milk.
Correct answer: Drugs5355. In gene pharming egg is fertilized:
- A. In-vitro
- B. In-vivo
- C. In bioreactor
- D. None of the above
Explanation: The eggs are fertilized in a laboratory dish in-vitro. Using a fine, hollow needle, a solution of DNA containing the transgene is injected into the male pronucleus of the fertilized egg (the nucleus of the sperm cell that entered the egg) before it fuses with the female pronucleus.
Correct answer: In-vitro5356. Anti-thrombin is produced in:
- A. Sheep
- B. Goat
- C. Mice
- D. Bovine
Explanation: Antithrombin III, for preventing blood clot during surgery, is currently being produced by a herd of goats, and clinical trials have begun.
Correct answer: Goat5357. The organisms which are used to produce human growth hormone in their urine are:
- A. Sheep
- B. Goat
- C. Mice
- D. Bovine
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: Mice5358. The production of genetically identical copies of the organisms by asexual reproduction is called:
- A. Recombinant DNA technology
- B. Cloning
- C. Gene pharming
- D. None of the above
Explanation: The term cloning describes a number of different processes that can be used to produce genetically identical copies of a biological entity. The copied material, which has the same genetic makeup as the original, is referred to as a clone.
Correct answer: Cloning5359. The first animal cloned was:
- A. Sheep
- B. Dolly
- C. Mice
- D. Bovine
Explanation: In 1997, scientists at the Roslin Institute in Scotland announced that they achieved this feat and had produced a cloned sheep called Dolly.
Correct answer: Dolly5360. In the cloning of mice the second nucleus is obtained from:
- A. Uterus cells
- B. Cumulus cells
- C. Skin cells
- D. None of the above
Explanation: In this way, viable cloned mice have been produced from the nuclei of cumulus cells freshly isolated from adult females (10) and short-term cultured cells derived from tails of adult males (11).
Correct answer: Cumulus cells