Syed Ali Academy

Q.1 Why enzymes are specific in nature? Ans Each different type of enzyme will usually act on only one substrate to catalyse one biological reaction. Enzymes are specific because different enzymes have differently shaped active sites. The shape of the active site of an enzyme is complementary to the shape of its specific substrate. This means they are the correct shapes to fit together. Q.2 why enzymes activity is directly proportional to enzymes concentration? Ans The answer is that if there are more enzymes available the more substrate will get a chance to participate in the reaction hence the more product will be formed. So if there are more enzymes more product will be formed as long as enzymes increases, if enzymes are in limited amount or enzymes decrease the reaction will also be decreased Q.3 Why enzymes are called temperature sensitive Ans The proteins in enzymes are usually globular. The intra- and intermolecular bonds that hold proteins in their secondary and tertiary struc

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1) Maintaining sugar level is the example of ________ A) positive feedback b) negative feedback c) Both a and b d) none of these 2) sweet glands are present in________ A) hypodermis b) epidermis c) dermis d) all of these 3) sweat consists of __________ A) salt b ) water c) urea d) all of these 4) Blood arterioles are present in ________ A) dermis b) hypodermis c) epidermis d) a.o.t 5) ______plants have reduced stomata A) hydrophytes b) mesophytes c) xerophytes d) halophytes 6) Malpighian tubules are present in ________ A) cockroaches b) planaria c) earthworm d) human 7) the removal of malfunctioning organ with healthy one is called_______ A) dialysis b) transplant c) lithotripsy d) n.o.t 8) which one is not the part of nephron A) pelvis b) Malpighian body c) p.c.t d) loop of henle 9) plant grow in salty areas are ________ A) hydrophytes b) xerophytes c) mesophytes d) halophytes 10) lithotripsy is used in______process A) renal surgery b) renal stone c) dialysis d) a.o.t 11) ________ col

  1 The opening of larynx is known as a a) epiglottis b) Thyroid c) thalamus d) glotis 2 Trachea has ___________________s­haped cartilaginous rings a) stone.       b) B.          c) C.        d) D 3 cartilaginous rings prevent trachea from a) shrinking b) contracting c) collapsing. d) A.O.T 4 In thelower part of thorax, lies a sheet of muscles called____________  A) phragm b) biphragm c) diaphragm d) N.O.T 5 Each lung is wrappedin two_______ membranes. a) peritoniam b) pericardium c) pleural d) cell membrane 6 Photosynthesis is an/a _____________ process a) anabolic b) catabolic c) metabolic d) both a and c 7) Synthesis of food from simple,inorganic substances, is known as______  a) photorespiration b) photosynthesis c) respiration d) A.O.T  8) ______serves as the respiratory medium of the protozoa  a) peritoniam b) pericardium c) pleural d) cell membrane 9) An increase surface forgaseous exchange allows a____rate of diffusion a) Faster b) Slower c) moderate d) n.o.t 10) Each alveolus