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.

Which of the following statement is not correct regarding malarial infection?

1. Plasmodium enters the human body as sporozoites through the bite of freshly moulted female Anopheles mosquito

2. High fever recurring every three to four days

3. Sporozoites initially multiple within the liver cells and then attack the RBCs resulting in their rupture.

4. When a female Anopheles mosquito bites an infected person, these parasites enter the mosquito's body and undergo further development.

Out of the following diseases which are caused due to bacterial infection?

a. Typhoid

b. Elephantiasis

c. Cholera

d. Tuberculosis

1. a & b only

2. b & c only

3. a, c & d only

4. a, b, c & d

Internal bleeding, muscular pain, fever, anaemia and blockage of the intestinal passage are the common symptoms of

1. Amoebiasis

2. Elephantiasis

3. Ascariasis

4. Typhoid