31. What is Southern blotting?
[A] Attachment of probes to DNA fragments
[B] Transfer of DNA fragments from electrophoretic gel to a nitrocellulose sheet
[C] Comparison of DNA fragments to two sources
[D] Transfer of DNA fragments to electrophoretic gel from cellulose membrane
Show Answer
Correct Answer: B [Transfer of DNA fragments from electrophoretic gel to a nitrocellulose sheet]
Notes:
Southern blotting is the transfer of DNA fragments from electrophoretic gel to a nitrocellulose sheet.
32. Which of the following is a product of biotechnology?
[A] Bacteria
[B] Skin
[C] Vaccine
[D] Plants
Show Answer
Correct Answer: C [Vaccine]
Notes:
The vaccine is a product of biotechnology. Vaccines prepare the immune system to recognize and attack invaders or antigens.
33. Who was the father of the green revolution?
[A] Verghese Kurien
[B] Herbert Boyer
[C] Har Gobind Korana
[D] Norman Borlaug
Show Answer
Correct Answer: D [Norman Borlaug]
Notes:
Norman Borlaug was the father of the green revolution.
34. The skin biting mosquito has legs as locomotory organ which are
____:
[A] One pair
[B] Two pairs
[C] Three pairs
[D] Four pairs
Show Answer
Correct Answer: C [Three pairs]
Notes:
Like all other insects, in a mosquito, the thorax is specialized for locomotion. Three pairs of jointed legs and a pair of wings are attached to the thorax. The insect wing is an outgrowth of the exoskeleton therefore analogous to winds of a birds.
35. A man suffering from diabetes mellitus drinks water more frequently as he has to eliminate from the blood extra ____:
[A] Glucose
[B] Insulin
[C] Glucagon
[D] Salt
Show Answer
Correct Answer: A [Glucose]
Notes:
The diabetic person has higher sugar in blood. Glucose is a form of water soluble sugar. Excess blood sugar decreases the elasticity of blood vessels and causes them to narrow, impeding blood flow. This can lead to a reduced supply of blood and oxygen, increasing the risk of high blood pressure and damage to large and small blood vessels.
36. In male sharks, Claspers are found attached to
____:
[A] Anal fin
[B] Ventral fin
[C] Pectoral fin
[D] Pelvic fin
Show Answer
Correct Answer: D [Pelvic fin]
Notes:
Claspers are organs found in male elasmobranchs. Each male has two claspers. They are located along the inner side of the shark or ray’s pelvic fin and are used in reproduction. During mating, the male deposits his sperm into the female’s cloaca (the opening that serves as the entrance to the uterus, intestine and urinary tract) via grooves that lie in the upper side of the claspers.
37. The colour change in the Chameleon is due to the presence of ____:
[A] Chromatophore
[B] Haemoglobin
[C] Chlorophyll
[D] Pneumatophore
Show Answer
Correct Answer: A [Chromatophore]
Notes:
Chameleons have specialized cells, chromatophores, which contain pigments in their cytoplasm, in three layers below their transparent outer skin. Dispersion of the pigment granules in the chromatophores sets the intensity of each color. Chromatophores contain pigments and reflect light, which are responsible for creating coloration. In chameleons, there are four types of chromatophores: xanthophores, erythrophores, iridiophores, and melanophores (Cooper and Greenberg, 1992).
38. Which one of the following is not a true fish?
[A] Jellyfish
[B] Starfish
[C] Cuttlefish
[D] All of the above
Show Answer
Correct Answer: D [All of the above ]
Notes:
The term fish is most strictly used to describe any animal with a backbone that has gills throughout life and has limbs, if any, in the shape of fins. Many types of aquatic animals commonly referred to as fish are not fish in this strict sense; examples include shellfish, cuttlefish, starfish, crayfish and jellyfish.
39. What causes the mottling of the dental enamel?
[A] High levels of chlorine in water
[B] High levels of nitrate in the water
[C] High levels of fluorides in the water
[D] High levels of calcium in the water
Show Answer
Correct Answer: C [High levels of fluorides in the water]
Notes:
The mottling of dental enamel is an extremely common disorder, characterized by hypomineralization of tooth enamel caused by ingestion of excessive fluoride during enamel formation. It is also known as dental fluorosis. Common causes of fluorosis include: fluoridated drinking water (particularly during infancy), ingestion of fluoride toothpaste, use of fluoride tablets, and consumption of processed foods made with fluoridated water.
40. The blotting technique used to identify the isolated protein is _____:
[A] Western blotting
[B] Northern blotting
[C] Southern blotting
[D] Cloning
Show Answer
Correct Answer: A [Western blotting]
Notes:
Protein electrophoresis and Western blotting are both methods used to identify specific proteins in a sample or solution. Western blotting, also known as immunoblotting or protein blotting, is a core technique in cell and molecular biology. It is used to detect the presence of a specific protein in a complex mixture extracted from cells.
