All Free Biology MCQs with Answers

• A. One cell control activities of others
• B. One cell transfers its activities to others
• C. One cell destroys other cells
• D. One cell transfers germs to another cell

Explanation: In metastasis, cancer cells break away from where they first formed (primary cancer), travel through the blood or lymph system, and form…

• A. Rickets
• B. Anemia
• C. Heart disorders other than stroke
• D. Stroke

Explanation: Correct option is B. Conditions that can cause increased LDH (lactate dehydrogenase and lactic acid dehydrogenase) in the blood may…

• A. Leukemia
• B. Edema
• C. Thalassemia
• D. Atherosclerosis

Explanation: "Leukaemia" is a type of cancer that results in the body making too many abnormal white blood cells.

• A. Prothrombin
• B. Lipoprotein
• C. Albumin
• D. Iron

Explanation: Serum albumin accounts for 55% of blood proteins and is a major contributor to maintaining the osmotic pressure of the plasma to assist in…

• A. 100 days
• B. 110 days
• C. 120 days
• D. 130 days

Explanation: This is a standard answer. Lifespan of RBCs is approximately 120 days.This option c suggests that the life span of red blood cells (RBCs)…

• A. A+ve
• B. O-ve
• C. AB+ve
• D. O+ve

Explanation: O negative donors are often called 'universal donors' because anyone can receive the red blood cells from their donations.

• A. Liver
• B. Large intestine
• C. Stomach
• D. Gall bladder

Explanation: Explanation for this question will be added soon.

• A. Hippocampus
• B. Hypothalamus
• C. Amygdala
• D. Thalamus

Explanation: Amygdala controls feelings and emotions of love, hate, anger, fear, rage, and sexual arousal.

• A. Skull
• B. Vertebral column
• C. Meninges
• D. CSF (cerebrospinal fluid)
• E. All of the above

Explanation: Explanation for this question will be added soon.

• A. Limbic system
• B. Cerebellum
• C. Cerebrum
• D. Thalamus
• E. Hypothalamus

Explanation: Explanation for this question will be added soon.

• A. Brain
• B. Adrenal gland
• C. Stomach
• D. Thymus

Explanation: Endorphins are neurotransmitters that are produced in various parts of the brain, including the hypothalamus and the pituitary gland.

• A. i only
• B. ii only
• C. ii & iii
• D. i, iv & v
• E. i & v

Explanation: Explanation for this question will be added soon.

• A. Triose
• B. Tetrose
• C. Pentose
• D. Hexose
• E. Heptose

Explanation: Explanation for this question will be added soon.

• A. Sucrose
• B. Fructose
• C. Lactose
• D. Maltose
• E. Glycerose

Explanation: Explanation for this question will be added soon.

• A. It has a sweet taste
• B. It is found in fruits
• C. It rotates the plane of polarized light to left
• D. It exhibits mutarotation

Explanation: The explanation for this question will be added soon.

• A. C-H
• B. C-N
• C. C-O
• D. C-C

Explanation: Hydroxyl groups allow for the carbs to make glycosidic linkages which are the important bonds that allow for polymers.

• A. Proteins
• B. Carbohydrates
• C. Lipids
• D. Vitamins

Explanation: Carbohydrates (example cellulose, starch, glycogen, glucose, fructose etc) are the most abundant biomolecules on earth.

• A. Fructose
• B. Sucrose
• C. Lactose
• D. Maltose

Explanation: Option A: Fructose is not a disaccharide. Disaccharides are carbohydrates that are composed of two monosaccharides joined together by a…

• A. Monosaccharides
• B. Oligosaccharides
• C. Polysaccharides
• D. Carbohydrates

Explanation: Option A: Monosaccharides are the simplest form of carbohydrates and cannot be further hydrolyzed into smaller units.

• A. C
• B. H
• C. N
• D. O

Explanation: 'Carbohydrates' are primordial and essential compounds, crucial to the body.