2281. How many vertebrae are present in vertebral column of man?
✅ A. 33 vertebrae
Option A: 33 vertebrae Option B: 33 pairs of vertebrae Option C: 25 vertebrae Option D: 31 vertebrae Correct Answer : 33 vertebrae Read more
Author: Sheeraz Ahmed – Page 115
2282. Which of the following vertebrates have a fish-like body?
✅ C. Amphibians
Option A: Reptiles Option B: Aves Option C: Amphibians Option D: Mammals. Correct Answer : Amphibians Read more
2283. Which of the following statement about fatigue is correct?
✅ D. All of these
Option A: The major event in it is accumulation of lactic aci Option B: Lactic acid accumulation turns pH in acidic range leading to muscle ach Option C: Ionic imbalance may also cause it. Option D: All of these Correct Answer : All of these Read more
2284. Rigor mortis i.e, stiffening of body after death results from__________?
✅ B. Unavailability of ATP, which is necessary to break the link between actin and myosin.
Option A: Accunulation of rigid proteins molecules in sarcoplam. Option B: Unavailability of ATP, which is necessary to break the link between actin and myosin. Option C: Decrease in body temperature after death. Option D: Death of tissue due to unavailability of O2. Correct Answer : Unavailability of ATP, which is necessary to break the link between actin and myosin. Read more
2285. Which of the following statement about an arthropod exoskeleton is incorrect?
✅ B. It contains joints, for the same purpose as present in human skeletal system
Option A: It permits gaseous exchange Option B: It contains joints, for the same purpose as present in human skeletal system Option C: It provides muscle attachment Option D: Like all the other types of exoskeleton, they lack sensation Correct Answer : It contains joints, for the same purpose as present in human skeletal system Read more
2286. Ecdysone is_________________?
✅ C. A hormone that regulates moulting in arthropods
Option A: An enzyme that digest endocuticle during an arthropodal ecdysis Option B: A newly formed exoskeleton in authropods Option C: A hormone that regulates moulting in arthropods Option D: A process that involves moulting Correct Answer : A hormone that regulates moulting in arthropods Read more
2287. Endoskeleton is secreted by?
✅ C. Mesoderm.
Option A: Ectoderm. Option B: Endoderm. Option C: Mesoderm. Option D: All of these Correct Answer : Mesoderm. Read more
2288. Which one of the following forms the blk of exoskeleton of an arthropod?
✅ B. Procuticle
Option A: Epicuticle Option B: Procuticle Option C: Ectocuticle Option D: None of these Correct Answer : Procuticle Read more
2289. What happens during muscle contraction to the length of each myosin and action filament?
✅ A. Z- lines get closer
Option A: Z- lines get closer Option B: A band becomes short Option C: 1 band elongates Option D: There is no change in sarcomere Correct Answer : Z- lines get closer Read more
2290. Which of the following step occurs immediately after binding of Ca2+ with troponin molecule during muscle contraction.
✅ C. Tropomyosin gets removed from the binding sites of actin filaments.
Option A: Binding sites of actin get attached to the myosin hea Option B: Troponin uncovers the actin binding sites. Option C: Tropomyosin gets removed from the binding sites of actin filaments. Option D: Ca2+ goes back inside sarcoplasmic reticulum. Correct Answer : Tropomyosin gets removed from the binding sites of actin filaments. Read more