3232 MTMTBIOLOGY TODAYBIOLOGY TODAY || march ‘16march ‘16
- Which of the following best explains the difference between
an epitope and an antigen?
(a) an epitope is any foreign substance; an antigen is a
foreign protein.
(b) an epitope is the part of an antigen where an
antibody or lymphocyte receptor binds.
(c) an antigen is the part of an epitope where an
antibody or lymphocyte receptor binds.
(d) antigens are recognised by B cells and antibodies;
epitopes are recognised by T cells.
True or false
- Schuffner’s dots are seen in red blood corpuscles of man
due to kala-azar.
- Bacteria Clostridium botulinum, that cause botulism are
obligate anaerobes.
- hIV has a protein coat and a genetic material which is
dsrNa.
- Pertussis, anthrax and tetanus are bacterial diseases.
- Opioids are drugs, which bind to specific opioid receptors
present in the central nervous system and gastrointestinal
tract.
- Igm is so named as it is a microglobulin, five times smaller
than IgG.
- chikungunya bacteria is transmitted by female Aedes
aegypti mosquito.
- Narcotic analgesics, anabolic steroids and diuretics are
commonly used by sportspersons to increase muscle
strength and enhance their performance.
- Both the Igm and IgG antibodies are produced in equal
concentration during the primary as well as secondary
immune response to an antigen.
- alcohol is a stimulant which is quickly absorbed by the
stomach and transferred to blood.
match The columns
- match column-I with column-II.
Column-I Column-II
a. allergy (i) activation of B-cells
B. helper T - cells (ii) chemotherapy
c. aIDS virus (iii) carcinogens
D. X-rays (iv) IgE
E. Treatment of cancer (v) Single stranded rNa
- match column-I with column-II. (There can be more than
one match for items in column-I).
Column-I Column-II
a. Typhoid (i) mary mallon
B. malaria (ii) haemozoin
c. Pneumonia (iii) Blue lips
D. ringworm (iv) Trichophyton
E. Elephantiasis (v) Filarial worm
(vi) Widal test
(vii) Haemophilus
influenzae
(viii) Microsporum
(ix) Wuchereria
(x) Sporozoites
Passage Based Questions
23.(A) complete the given passage with appropriate words or
phrases.
acquired immunity is (i). It is characterised by (ii).
This means that our body when it encounters a (iii) for
the first time produces a response called (iv). Which
is of (v) intensity. Subsequent encounter with the
same pathogen elicits a (vi) intensified secondary or an
anamnestic response. The primary and secondary immune
responses are carried out with the help. (vii) and (viii).
b-lymphocytes produce (ix) in response to pathogen
whereas T cells do not secret antibodies but help (x) to
secrete them.
(B) read the given passage and correct the errors, wherever
present.
Plasmodium enters the human body as cryptomerozoites
through the bite of infected male Anopheles mosquito. The
parasite initially multiplies within rBcs and then attacks
liver cells resulting in their rupture. Genesis of rBcs is
associated with the release of haematozylin which is
responsible for the chill and high fever recurring every one
to two days. When the mosquito bites an infected person,
these parasite enter the mosquito’s body, multiply and get
stored in rBcs.
Assertion & reason
In each of the following questions, a statement of assertion (a)
is given and a corresponding statement of reason (r) is
given just below it. Of the statements, mark the correct
answer as :
(a) if both a and r are true and r is the correct explanation
of a
(b) if both a and r are true but r is not the correct explanation
of a
(c) if a is true but r is false
(d) if both a and r are false.
- Assertion : Entamoeba histolytica is dimorphic and
digenetic.
Reason :It occurs in two forms - larger, harmless, magna
form in pig, and smaller, harmful, minuta form in man.
