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GATE 2015 : Life Sciences [Section L]

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GATE 2015 ZOOLOGY XL-L L : ZOOLOGY Q. 1 Q. 10 carry one mark each. Q.1 The term paedomorphosis refers to (A) Accelerated reproductive development as compared to somatic development (B) A transient stage in the developmental event (C) Two independent structures resembling each other, yet performing different functions (D) A form of mimicry Q.2 Which one of the following statements is TRUE when determining the age of a fossil using carbon dating? (A) Carbon dating is based on carbon-13 to carbon-12 ratio in fossils (B) Carbon dating is useful for determining the age of only fossils older than 100,000 years (C) Older the fossil, lesser the carbon-14 to carbon-12 ratio (D) Older the fossil, lesser the carbon-12 to carbon-14 ratio Q.3 Constitutive enzymes are (A) Induced by effector molecules (B) Repressed by repressors (C) Encoded by sequences that occur as part of an operon (D) Always produced in the cell Q.4 Which one of the following is a function of intermediate filaments? (A) Chromosome movement during the cell division (B) Cytoplasmic streaming (C) Formation of tight junctions (D) Anchorage of the nucleus Q.5 Which one of the following statements is FALSE with respect to phospholipids? (A) Phospholipids have amphipathic character (B) Phospholipids form the lipid bilayer of the cell membrane (C) Phospholipids form micelles in living systems (D) Some phospholipid molecules may contain a double bond in hydrophobic tails Q.6 Which one of the following organs is INCORRECTLY paired with its function? (A) Intestinal villi absorption (C) Gall bladder carbohydrate digestion Q.7 Where do B lymphocytes acquire immune competence? (A) Thymus Q.8 (B) Bone Marrow (C) Lymph nodes (D) Spleen Which one of the following life cycle stages of Plasmodium falciparum is infectious? (A) Sporozoite XL-L (B) Epiglottis closure of larynx (D) Parietal cells hydrochloric acid (B) Cryptozoite (C) Merozoite (D) Trophozoite 1/3

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