Biology Today — May 2017

(WallPaper) #1
A B C
(a) IgM Granules of hapten Mast cell
(b) IgG Granules of serotonin Basophil
(c) IgE Granules of histamine Mast cell
(d) IgA Granules of opsonin Histocytes


  1. Match column I with column II and select the correct option
    from the codes given below.
    Column I Column II
    A. Microsporum canis (i) Measles
    B. Bordetella pertussis (ii) Syphilis
    C. Treponema pallidium (iii) Bubonic plague
    D. Rubeola virus (iv) Whooping cough
    E. Yersinia pestis (v) Ringworm
    (a) A-(iii), B-(i), C-(v), D-(ii), E-(iv)
    (b) A-(ii), B-(iv),C-(iii),D-(v), E-(i)
    (c) A-(iv), B-(iii), C-(i), D-(v), E-(ii)
    (d) A-(v), B-(iv), C-(ii),D-(i), E-(iii)

  2. Read the following statements and select the correct option
    stating which ones include true (T) and which ones are false
    (F).
    I. Hepatitis B is transmitted by parenteral route.
    II. Symptoms of hepatitis include light coloured urine and
    dark stools.
    III. Hepatitis A virus has RNA as the genetic material.
    IV. Incubation period for Hepatitis A is 6-8 weeks.
    I II III IV
    (a) T T T F
    (b) F T T T
    (c) T F T F
    (d) F T F T

  3. Study the chemical structure below and select the correct
    option regarding it.
    CH 3
    CH 3


O

O

O

O

H

H

N

(a)  It is a crystalline powder obtained from plant
Erythroxylon coca.
(b) It has hallucinogenic properties obtained from hemp
plant.
(c) It is a psychedelic drug causing horrible dreams.
(d) It is a type of opium derivative, strong analgesic with
sedative and calming effects.


  1. Rohan suffered from chicken pox when he was five years old.
    His body has developed life time resistance to the infection,
    due to
    (a) natural passive immunity


(b)  artificial active immunity
(c) natural active immunity
(d) artificial passive immunity.


  1. Study the table and identify A, B, C and D.
    Disease Site of infection Effect
    Taeniasis A Anaemia
    B Caecum and
    appendix


Bloody stools

Enterobiasis C Appendicitis
Giardiasis Small intestine D
(a) A-Large intestine, B-Ancylostomiasis, C-Colon and
appendix, D-Epigastric pain and fever
(b) A-Small intestine, B-Trichuriasis, C-Caecum and colon,
D-Epigastric pain and headache
(c) A-Subcutaneous tissue, B-Ascariasis, C-Small intestine,
D-Enlargement of spleen and fever
(d) A-Caecum and appendix, B-Ascariasis, C-Large
intestine, D-Enlargement of spleen and fever


  1. Which of the following statements regarding antigen-
    antibody complex is incorrect?
    (a) Neutralisation occurs when antibody-antigen reaction
    blocks bacterial toxins, viruses, etc., from affecting the
    body cells.
    (b) Clumping of blood cells or microorganisms due to
    antigen-antibody reaction is called agglutination.
    (c) Some antibodies can attack and rupture the plasma
    membrane of a cell causing precipitation.
    (d) Neighbouring cells aggregate when a single antibody
    binds with the epitopes of two or more different
    antigens at the same time.

  2. Consider the following statements and select the correct
    option that fills the blanks.
    I. The lymphoid organ that is responsible for producing
    phagocytic macrophages is __.
    II. is pentamer in structure and cannot cross the
    placental barrier.
    III.
    can induce antibody formation only when they
    combine with larger protein molecules serving as carriers.
    I II III
    (a) Peyer’s patches IgA Epitope
    (b) Thymus IgM Opsonins
    (c) Spleen IgM Haptens
    (d) Tonsils IgA Partial antigen

  3. One difference between a cancer cell and a normal cell is
    that
    (a) the cancer cell is unable to synthesise DNA
    (b) the cell cycle of the cancer cell is arrested at the
    S-phase
    (c) cancer cells continue to divide in a regulated manner
    even when they are tightly packed

Free download pdf