All Free Biology MCQs with Answers

• A. 2001
• B. 1999
• C. 2005
• D. 2000

Explanation: Experimental administration of the HIV virus began in 2001 (BOOK INFORMATION.)

• A. RBCs
• B. Platelets
• C. Leukocytes
• D. None of these

Explanation: The human immunodeficiency virus (HIV) infects leukocytes, also known as white blood cells.

• A. 1994
• B. 1984
• C. 1950
• D. 1920

Explanation: The AIDS virus (HIV) was discovered in 1984.

• A. Human Immunodeficiency Virus
• B. Parvovirus
• C. Influenza Virus
• D. Paramyxovirus

Explanation: HIV (Human Immunodeficiency Virus) is a virus that attacks the body's immune system.

• A. When it attacks the T cells
• B. When it replicates at maximum level
• C. When it destroys the body cells
• D. All of these

Explanation: AIDS is the late stage of HIV infection that occurs when the body's immune system is badly damaged because of the virus.

• A. Replicase
• B. Reverse transcriptase
• C. Transcriptase
• D. Reverse replicase

Explanation: HIV is the causative agent of AIDS. It is a retrovirus. The enzymes needed for HIV replication are reverse transcriptase, integrase, and…

• A. A person has AIDS
• B. A person having two positive tests for HIV
• C. A person can transmit the HIV
• D. A person is safe from AIDS

Explanation: Option: C Being HIV positive means there is evidence of presence of the HIV in the body and is a chance of transferring the virus through…

• A. 11
• B. 12
• C. 13
• D. 14

Explanation: Option B is correct because it is fact that HIV glycoprotein is composed of 12 subunits.

• A. Heterosexuals
• B. Homosexuals
• C. Both
• D. None

Explanation: The AIDS was reported by some physicians in early 1980's in young males having one or more of complex symptoms such as severe pneumonia, a…

• A. Sexual contact
• B. Blood
• C. Breast feeding
• D. All of the above

Explanation: HIV is a sexually transmitted disease that spreads to the blood, especially in trageting cells of the immune system known as T-cells thus…

• A. RNA polymerase I
• B. DNA polymerase II
• C. Reverse transcriptase I
• D. Reverse transcriptase

Explanation: HIV pathogenesis is a condition in which there is a competition between HIV replication and the immune responses of the patient.

• A. Type of lymphocytes
• B. Present in blood and work as the defence system
• C. They kill the foreign invader
• D. All of these options are correct

Explanation: A type of white blood cell, T-cells are part of the immune system and develop from stem cells in the bone marrow.

• A. The virus is highly mutated
• B. The vaccine is too expensive
• C. The virus can be controlled through change in hygiene
• D. None of these

Explanation: Option A is correct since HIV can be mutated very rapidly and numerous strains of HIV exist.

• A. 1986
• B. 1980
• C. 1992
• D. 1970

Explanation: The term "HIV" (Human Immunodeficiency Virus) was coined in 1986. However, it's important to note that the virus itself was discovered…

• A. Replicase
• B. Reverse transcriptase
• C. Transcriptase
• D. Reverse replicase

Explanation: The replication of the HIV (Human Immunodeficiency Virus) nucleic acid depends on the activity of the enzyme reverse transcriptase.

• A. The virus is highly mutated.
• B. The vaccine is too expensive.
• C. The virus can be controlled through change in hygiene.
• D. None of these options is correct.

Explanation: Efforts to develop an HIV vaccine have been hampered by the genetic diversity of the virus itself.

• A. RNA polymerase I
• B. DNA polymerase II
• C. Reverse Transcriptase I
• D. Reverse Transcriptase

Explanation: When HIV RNA enters the cell it must be "reverse transcribed" into proviral DNA before it can be integrated into the DNA of the host cell.

• A. Simian Imunodeficiency Virus
• B. Silurian Imunodeficiency Virus
• C. Siberian Imunodeficiency Virus
• D. Both A and C

Explanation: Simian immunodeficiency viruses (SIV) are members of the Lentivirus genus of Retroviruses that infect nonhuman primates such as monkeys…

• A. Lymphocytes
• B. Cancer cells
• C. Stem cells
• D. T lymphocytes

Explanation: HIV primarily targets a type of cell in the immune system called the CD4+ T cell.

• A. Safe and protected lifestyle
• B. Use of sterile injections and needles
• C. Use of available vaccines
• D. Safe blood transfusion methods

Explanation: There is no vaccine currently available to offer protection against AIDS caused by HIV.