All Free Biology MCQs with Answers

• A. Cluster
• B. Spherical or curried up ball
• C. Long strands or fibrils
• D. Flat uncoiled chains

Explanation: The options describe different conformations of polypeptide chains.Option A describes a formation, not characteristic of fibrous…

• A. Ethane
• B. Fatty acid
• C. H atom
• D. Competitive reversible

Explanation: Glycine is the simplest amino acid, with its R group (the side chain of an amino acid) consisting of just a single hydrogen atom.

• A. Primary structure of protein
• B. Secondary structure of protein
• C. Tertiary structure of protein
• D. Quaternary structure of protein

Explanation: Tertiary structure of protein represents the unique three-dimensional shape of the fully folded polypeptide.

• A. Physiological components
• B. Functional components
• C. Structural components
• D. Biological components

Explanation: Proteins play a crucial role as the main structural components of the cell.

• A. Condensation
• B. Hydrolysis
• C. Glycolysis
• D. Fixation

Explanation: Hydrolysis is a chemical reaction where water is used to break down a compound, resulting in the separation of the compound into its…

• A. Mechanoreceptor
• B. Nociceptors
• C. Chemoreceptors
• D. Thermoreceptors

Explanation: Nociceptors are responsible for detecting pain sensations and transmitting them to the brain.This option is not correct.

• A. Homeostasis
• B. Sensory receptors
• C. Caffeine
• D. The medulla

Explanation: Sensory receptors, specifically nociceptors, are responsible for sending the pain message to the brain when a finger (or any other part of…

• A. Necrosis
• B. Metastasis
• C. Epistasis
• D. Apoptosis

Explanation: Explanation:The internal program of events and sequences of morphological changes by which a cell commits suicide is collectively called…

• A. Necrosis
• B. Metastasis
• C. Apoptosis
• D. Epistasis

Explanation: [A] Necrosis is the death of a body tissue,occurring when too little blood flows to the tissue.[B]Metastasis means that cancer has spread…

• A. Mitosis
• B. Meiosis
• C. Cell Growth
• D. Mitosis & Meiosis

Explanation: Mitosis is important for three main reasons: development and growth, cell replacement, and asexual reproduction.Mitosis heals wounds by…

• A. Anticodon site
• B. Ribosomes recognition site
• C. 3'-site with terminal OH
• D. Activation enzyme recognition site

Explanation: [A] At anticodon site is complementary to a corresponding codon in mRNA and binds to that specific complementary codons[B] Ribosome…

• A. Genital herpes
• B. Gonorrhea
• C. AIDS
• D. Syphilis

Explanation: Explanation:Gonorrhea is a bacterial infection caused by the bacterium Neisseria gonorrhea.

• A. Abdominal Pain
• B. Vesicular lesions in the epithelial layer
• C. Fever
• D. Failure of immune system

Explanation: Explanation:This is a common symptom of herpes simplex, which presents as painful, fluid-filled blisters or vesicles on or around the…

• A. Blood transfusion
• B. Blood clotting
• C. Absence of fibrinogen
• D. Contaminated soil

Explanation: Hepatitis B is a potentially life-threatening liver infection caused by the hepatitis B virus (HBV). It is a major global health problem.

• A. Oro-fecal Route
• B. Unsafe Sex
• C. Vector Borne
• D. Droplet Infection

Explanation: Gonorrhea is a sexually transmitted disease that is introduced into the body through sexual contact, usually through genitals and oral…

• A. Hair
• B. Heart
• C. Peripheral Nervous System
• D. Birth canal

Explanation: Syphilis, at its late stages, is known to cause cardiovascular diseases which involve the enlargement of the heart such that the aorta can…

• A. Will produce anti-Rh antibodies if given Rh* blood
• B. Rh* antigens are present on RBCs
• C. Cannot produce anti-Rh antibodies in any case
• D. Rh* antibodies are present in blood

Explanation: Explanation:If Rh- person receives Rh antigen through the wrong Rh+ blood transfusion, he will begin to produce anti-Rh antibodies against…

• A. AIDS and Cancer
• B. Malaria and AIDS
• C. Typhoid and Cancer
• D. Measles and Mumps

Explanation: Measles and mumps, both can be prevented by a joint two-dose vaccine, i.e. the MMR vaccine.

• A. Platelets
• B. B-Lymphocytes
• C. Eosinophils
• D. T-Lymphocytes

Explanation: The thymus gland is involved in the maturation of T cells, a type of white blood cell that plays a vital role in the immune system.

• A. Antigens
• B. Immunogens
• C. Serum
• D. Immunoglobulins

Explanation: Immunoglobulins (antibodies) are directly introduced to provide immediate immunity.