All Free Biology MCQs with Answers

• A. Monocytes
• B. Lymphocytes
• C. Neutrophils
• D. Thrombocytes

Explanation: Lymphocytes are white blood cells that are also one of th·e body's main types of immune cells.

• A. Natural passive immunity
• B. Natural active immunity
• C. Acquired/Artificial active immunity
• D. Acquired/Artificial passive immunity

Explanation: Vaccination involves introducing antibodies (acquired) or antibodies-producing agents (artificial) into the body to provide active immunity.

• A. Lipase
• B. Protease
• C. Amylase
• D. Polymerase

Explanation: Option A: Lipase is an enzyme that primarily breaks down lipids (fats). It does not play a significant role in digesting antibodies.

• A. 1876
• B. 1796
• C. 1696
• D. 1850

Explanation: Correct option is B. Dr Edward Jenner created the world's first successful vaccine.

• A. C5H10O5
• B. C5H8O4
• C. C5H10O4
• D. C5H8O3
• E. C5H10O3

Explanation: Explanation for this question will be added soon.

• A. 0
• B. 1
• C. 2
• D. 3

Explanation: Option A: This option suggests that there are no hydrogen bonds in a Cytosine-Guanine pair.

• A. Hypothalamus
• B. Medulla
• C. Cerebrum
• D. Pons

Explanation: Hypothalamus consists of a homeostatic thermostat in the brain as it regulates a wide spectrum of physiological functions such as hunger…

• A. Homeostasis
• B. Natural health
• C. Strucutral adaptation
• D. Osmoregulation

Explanation: Homeostasis is the tendency of an organism or cell to regulate its internal conditions, such as the chemical composition of its body…

• A. Hormones
• B. Osmosis
• C. Homeostasis
• D. Ecology

Explanation: This is a standard answer. The maintenance of a stable/constant internal environment is called homeostasis.

• A. Thalamus
• B. Hypothalamus
• C. Pones
• D. Cerebellum

Explanation: Our internal body temperature is regulated by a part of our brain called the hypothalamus.

• A. Kidneys
• B. Brain
• C. Lungs
• D. Liver

Explanation: The body's temperature control center is the hypothalamus which itself is part of the brain.

• A. Homeostasis
• B. Evolution
• C. Genetics
• D. Metabolism

Explanation: Homeostasis refers to the body's ability to maintain a stable and balanced internal environment, despite external changes.

• A. Rodents
• B. Fowls
• C. Cats
• D. All of these

Explanation: d) All of these:The correct answer is d) All of these. Retroviruses have been identified to cause diseases in rodents, fowls, and cats.

• A. Rhabdo Virus
• B. Reo Virus
• C. Parvo Virus
• D. Rhino Virus
• E. Herpes Virus

Explanation: Explanation for this question will be added soon.

• A. DNA and RNA
• B. DNA
• C. RNA
• D. DNA or RNA

Explanation: Option D is correct since viruses can store decoded information ( genetic information ) to a limited extent.

• A. Adenovirus
• B. Pox virus
• C. Influenza virus
• D. Herpes virus

Explanation: Infection with herpes simplex virus (HSV), known as herpes, is common globally.

• A. Envelope
• B. DNA
• C. Capsid
• D. Tail Fibers

Explanation: All viruses contain nucleic acid, either DNA or RNA, and a protein coat, which encases the nucleic acid i.e. a capsid.

• A. DNA
• B. RNA
• C. Both a and b
• D. Proteins

Explanation: The genetic material of plant viruses mostly consists of option B: RNA.Explanation:A) DNA: While some viruses, such as certain…

• A. They are cuboidal in shape
• B. They are enveloped by host plasma membrane
• C. They do have enzyme reverse transcriptase
• D. All of them are not specific

Explanation: The first option is correct: Retroviruses are not cuboidal in shape. Retroviruses are actually spherical or roughly spherical in shape.

• A. HIV
• B. Hepatitis
• C. Measles
• D. Influenza

Explanation: FACT: Influenza is a viral disease and is caused by RNA enveloped virus, called the influenza virus.