31. Klenow fragment is derived from which of the following?
[A] DNA Ligase
[B] DNA Pol-I
[C] DNA Pol-II
[D] Reverse Transcriptase
Show Answer
Correct Answer: B [DNA Pol-I]
Notes:
Klenow fragment is derived from DNA Pol-I. A Klenow fragment is a large protein fragment. It is enzymatically cleaved by the protease subtilisin to DNA polymerase from E. coli.
32. Heart attack occurs due to
____:
[A] Impairment of hearts working due to unknown reasons
[B] Bacterial attack on the heart
[C] Lack of supply of blood to the heart itself
[D] Stopping of heart beat
Show Answer
Correct Answer: C [Lack of supply of blood to the heart itself]
Notes:
A heart attack occurs when blood flow to a part of your heart is blocked for a long enough time that part of the heart muscle is damaged or dies. The medical term for this is myocardial infarction. Most heart attacks are caused by a blood clot that blocks one of the coronary arteries. The coronary arteries bring blood and oxygen to the heart. If the blood flow is blocked, the heart is starved of oxygen and heart cells die.
33. In winter, at the time of hibernation, Toads maintain breathing through ____:
[A] Lungs
[B] Skin
[C] Both by Skin and Lungs
[D] Buccal cavity
Show Answer
Correct Answer: B [Skin]
Notes:
During hibernation in winter, toads or frogs spend the time tucked away deep in the soil, in the mud underwater or hidden amidst foliage or rotting plants. Outside of times of hibernation, they usually take in oxygen via the air, employing their lungs. However, during hibernation, they receive their necessary oxygen through their permeable skin. This is referred to as cutaneous gas exchange.
34. The main protein found in milk is ____:
[A] Globulin
[B] Globin
[C] Casein
[D] Albumin
Show Answer
Correct Answer: C [Casein]
Notes:
The major proteins in milk are casein and whey. These two milk proteins are both excellent sources of all the essential amino acids, but they differ in one important aspect—whey is a fast-digesting protein and casein is a slow-digesting protein. As a food source, casein supplies amino acids, carbohydrates, and the two inorganic elements calcium and phosphorus.
35. Which of the following cell organelle contains DNA apart from nucleus?
[A] Golgi Apparatus
[B] Mitochondria
[C] Cytoplasm
[D] Ribosome
Show Answer
Correct Answer: B [Mitochondria]
Notes:
The three organelles that contain DNA are the nucleus, mitochondria and chloroplasts. Mitochondria are unlike most organelles (with an exception of plant chloroplasts) in that they have their own set of DNA and genes that encode proteins. They are specialized structures unique to the cells of animals, plants and fungi.
36. To digest protein which of the enzyme is present in pancreatic juice?
[A] Pepsin
[B] Upes
[C] Trypsin
[D] Amaylase
Show Answer
Correct Answer: C [Trypsin]
Notes:
Trypsin is an enzyme that helps us digest protein. In the small intestine, trypsin breaks down proteins, continuing the process of digestion that began in the stomach. It may also be referred to as a proteolytic enzyme, or proteinase. Trypsin is produced by the pancreas in an inactive form called trypsinogen. The trypsinogen enters the small intestine through the common bile duct and is converted to active trypsin.
37. The deficiency of which nutrient causes night blindness?
[A] Vitamin A
[B] Vitamin C
[C] Vitamin K
[D] Proteins
Show Answer
Correct Answer: A [Vitamin A]
Notes:
Night blindness, also called nyctalopia, is failure of the eye to adapt promptly from light to darkness that is characterized by a reduced ability to see in dim light or at night. It occurs as a symptom of numerous congenital and inherited retinal diseases or as a result of vitamin A deficiency.
38. Just born baby has the respiratory rate as ____:
[A] 15 times/minute
[B] 18 times/minute
[C] 26 times/minute
[D] 32 times/minute
Show Answer
Correct Answer: A [15 times/minute]
Notes:
New born babies and children normally breathe faster than older children and adults. Their respiratory rate is about 30-60 breaths per minute. The respiratory rate for the different age-categories of children is:-6-12 months: 24-30; 1-5 years: 20-30; 6-12 years: 12-20.
39. Haemoglobin has highest affinity for ____:
[A] Carbon monoxide
[B] Nitrogen
[C] Oxygen
[D] Carbon dioxide
Show Answer
Correct Answer: C [Oxygen]
Notes:
Haemoglobin is the iron-containing oxygen-transport metaloprotein in the red blood cells. It is responsible for binding oxygen in the lung and transporting the oxygen throughout the body to be used up in aerobic metabolic pathways.
40. Which part becomes modified as the tusk of elephant?
[A] Premolar
[B] Second incisor
[C] Molar
[D] Canine
Show Answer
Correct Answer: B [Second incisor]
Notes:
Tusks are elongated, continuously growing front teeth (incisors) usually but not always in pairs, that protrude well beyond the mouth of certain mammal species. They are most commonly canines, as with warthogs, pig, and walruses but in the case of elephants, elongated incisors. In most tusked species both the males and the females have tusks although the males’ are larger.