During an allergic reaction, the binding of
antigens to IgE antibodies initiates a response,
in which chemicals cause the dilation of blood
vessels and a host of other physiological
changes, Such chemicals are
1. interferons             2. hormones
3. histamines             4. acetylamine

Cirrhosis of liver is caused by the chronic intake of

1. opium

2. alcohol

3. tobacco

4. cocaine

Which one of the following is the correct statement regarding the particular psychotropic drug specified?
1. Hashish causes altered thought perceptions and hallucinations
2. Opium stimulates the nervous system and causes hallucinations
3. Morphine leads to delusions and disturbed emotions
4. Barbiturates cause relaxation and temporary euphoria

Cancer cells differ from normal cells by the 

1. Breakdown of regulatory mechanism

2. Loss of the property of contact inhibition

3. Attaining the property of contact inhibition

4. Both 1 & 2

MALT (Mucosa-associated lymphoid tissue) constitutes:

1. 25 percent of the lymphoid tissue in the human body

2. 50 percent of the lymphoid tissue in the human body

3. 75 percent of the lymphoid tissue in the human body

4. 90 percent of the lymphoid tissue in the human body 

Mark the incorrect statement with respect to AIDS:

1. AIDS is not spread by mere touch.

2. Time lag between infection and the appearance of AIDS symptoms is just 5-6 months only.

3. It is caused by a retrovirus.

4. HIV enters body cells by receptor-mediated endocytosis.

Which of the following about AIDS virus is incorrect ?

1. AIDS virus is RNA virus

2. The major cell infected by HIV is Helper T lymphocyte that bears ${\mathrm{CD}}_4$ receptor sites

3. The attachment of virus of ${\mathrm{CD}}_4$ receptor site is by the help of GP-4 T on the protein coat of virus

4. The genome of HIV consists of two identical molecules of single stranded RNA

Antitoxin consists of 

1. Antibodies

2. Toxoid

3. Antibiotics 

4. Live attenuated pathogen

Select the correct match:

1. Dengue, chikungunya, filariasis - Vector borne disease  

2. Acid, saliva, mucus in GIT - Physiological barriers

3. Histamine, cortisol, adrenaline - Anti-inflammatory compounds

4. Crack, smack, charas - Hallucinogens

Select the correct statement

1. Cells in a malignant tumor do not show contact inhibition

2. Computed tomography scans use non-ionising radiations to study cancer of internal organs.

3. AIDS is a retroviral disease caused by unenveloped HIV.

4. Treatment of AIDS with antiretroviral drugs is completely effective and always prevents death.