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Human Health and Disease · Question 51

AIPMT 2014MCQEasy📈 Topic in 12% papers+4−1
1

At which stage of HIV infection does one usually show symptoms of AIDS ?

  1. Within 15 days of sexual contact with an infected person.
  2. When the infected retro virus enters host cells.
  3. When HIV damages large number of helper T-Lymphocytes.
  4. When the viral DNA is produced by reverse transcriptase.

Answer

(3) When HIV damages large number of helper T-Lymphocytes.

Solution

As per NCERT, after getting into the body HIV enters macrophages, where its RNA genome is replicated to viral DNA by reverse transcriptase; the macrophages continue to produce virus (HIV factory).

⇒ HIV then enters helper T-lymphocytes (TH), replicates and produces progeny viruses, which attack other helper T-lymphocytes.

⇒ This leads to a progressive decrease in the number of helper T-lymphocytes; the person starts suffering from infections and shows the symptoms of AIDS.

∵ There is always a time-lag between infection and appearance of AIDS symptoms (a few months to many years, usually 5–10 years), options (1), (2) and (4) are early stages without symptoms.

Answer: (3)

AIPMT 2014

Keep practising — Human Health and Disease

2

Infection of Ascaris usually occurs by :

  1. Tsetse fly
  2. mosquito bite
  3. drinking water containing eggs of Ascaris
  4. eating imperfectly cooked pork
NEET 2013
3

Identify the site where Wuchereria bancrofti is normally found on human body :

  1. Blood vessels of the thigh region
  2. Lymphatic vessels of the lower limbs
  3. Muscles of the legs
  4. Skin between the fingers
NEET 2013 (Karnataka)
4

Which one of the following is a hallucinogenic drug?

  1. Morphine
  2. Opium
  3. Caffeine
  4. Lysergic acid diethylamide
NEET 2013 (Karnataka)
5

Identify the molecules (a) and (b) shown below and select the right option giving their source and use. [figure]

  1. Molecule (b) Heroin, Source Cannabis sativa, Use Depressant and slows down body functions
  2. Molecule (a) Morphine, Source Papaver somniferum, Use Sedative and pain killer
  3. Molecule (a) Cocaine, Source Erythroxylum coca, Use Accelerates the transport of dopamine
  4. Molecule (b) Cannabinoid, Source Atropa belladonna, Use Produces hallucinations
AIPMT 2012 (Mains)
6

Which one of the following statements is correct with respect to immunity?

  1. Rejection of a kidney graft is the function of B-lymphocytes.
  2. Preformed antibodies need to be injected to treat the bite by a viper snake.
  3. The antibodies against smallpox pathogen are produced by T-lymphocytes
  4. Antibodies are protein molecules, each of which has four light chains.
AIPMT 2012 (Mains)
7

Motile zygote of Plasmodium occurs in

  1. Human liver
  2. Salivary glands of Anopheles
  3. Human RBCs
  4. Gut of female Anopheles
AIPMT 2012 (Prelims)
8

Common cold differs from pneumonia in that

  1. Pneumonia is a communicable disease whereas the common cold is a nutritional deficiency disease
  2. Pneumonia can be prevented by a live attenuated bacterial vaccine whereas the common cold has no effective vaccine
  3. Pneumonia is caused by a virus while the common cold is caused by the bacterium Haemophilus influenzae
  4. Pneumonia pathogen infects alveoli whereas the common cold affects nose and respiratory passage but not the lungs
AIPMT 2012 (Prelims)
9

Which one of the following is not a property of cancerous cells whereas the remaining three are ?

  1. They do not remain confined in the area of formation
  2. They divide in an uncontrolled manner
  3. They compete with normal cells for vital nutrients
  4. They show contact inhibition
AIPMT 2012 (Prelims)
10

Cirrhosis of liver is caused by the chronic intake of

  1. Cocaine
  2. Alcohol
  3. Tobacco (Chewing)
  4. Opium
AIPMT 2012 (Prelims)
11

Widal Test is carried out to test :

  1. HIV/AIDS
  2. Typhoid fever
  3. Malaria
  4. Diabetes mellitus
AIPMT 2012 (Prelims)

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