All Free Biology MCQs with Answers

1781. The term biology was introduced in__________ in 1800?

• A. Germany
• B. Turkey
• C. Italy
• D. Japan

Explanation: The term biology was introduced in Germany around 1800, with its early use associated with German scholar Gottfried Reinhold Treviranus and also with Lamarck's work. The country, rather than the exact wording of the date, identifies the correct option. Students may choose Italy because several important early biological and medical studies originated there, but that is unrelated to the introduction of this term.

1782. Biometry is the application of_______ in biology.

• A. Algebra
• B. Statistics
• C. Matrix
• D. Geometry

Explanation: Biometry applies statistical methods to biological measurements, such as variation in body size, inheritance, and population data. Algebra, matrices, and geometry may be used in particular analyses, but they are not what the term biometry primarily means. Students may choose algebra because biological measurements can involve equations, but the defining tool is statistics.

1783. __________ is essential for the formation of hemoglobin.

• A. Calcium
• B. Iron
• C. Water
• D. Carbohydrates

Explanation: Iron is essential because it forms the haem group of haemoglobin, which binds oxygen reversibly in red blood cells. Students may choose calcium because it is important for bones and muscles, but it is not the mineral incorporated into haemoglobin.

1784. Chlorophyll is a naturally occurring chelate compound in which central metal is

• A. copper
• B. magnesium
• C. iron
• D. None of these

Explanation: Chlorophyll is a chelate in which a magnesium ion is held at the centre of a large porphyrin-like ring. Students may choose iron because iron is central in haemoglobin, but haemoglobin and chlorophyll contain different central metals.

1785. Which of the following proteins have role in heredity?

• A. Chromo-proteins
• B. Lipo-proteins
• C. Phospho-proteins
• D. Nucleo-proteins

Explanation: Nucleoproteins consist of nucleic acids associated with proteins, and nucleic acids such as DNA carry hereditary information. Phosphoproteins also contain phosphate groups, but phosphate alone does not make them hereditary material, so students may choose phosphoproteins because DNA contains phosphate groups.

1786. Special kind of protein containing iron is called as _________ ?

• A. Hormones
• B. Hemoglobin
• C. Red blood cell
• D. White blood cell

Explanation: Hemoglobin is an iron-containing conjugated protein because its globin protein is combined with haem groups containing iron. Students may choose a red blood cell because red blood cells contain hemoglobin, but the question asks for the protein itself.

1787. Bacteriochlorophylls does not include________________?

• A. Chlorophyll e
• B. Chlorophyll d
• C. Chlorophyll a
• D. Chlorophyll c

Explanation: Bacteriochlorophylls are specialized pigments of photosynthetic bacteria and include forms such as bacteriochlorophylls a, b, c, d and e. Chlorophyll a is the major pigment of oxygenic photosynthetic organisms, not a bacteriochlorophyll, so option c is the exception. Students may choose chlorophyll d because it is less familiar, but it is included among the bacteriochlorophyll types.

1788. Which conjegated molecules play important role in gene expression___________?

• A. Glycolipids
• B. Glycoproteins
• C. Nucleohistones
• D. None of these

Explanation: Nucleohistones consist of DNA associated with histone proteins and help package DNA into chromosomes, influencing which genes are accessible for expression. Glycoproteins and glycolipids mainly function in membranes, recognition and secretion. Students may choose glycoproteins because they are important in cell signalling, but nucleohistones are the conjugated molecules directly linked with gene regulation.

1789. Most of the cellular secretions are ________ in nature?

• A. Glycolipids
• B. Glycoproteins
• C. Nucleohistones
• D. Proteins

Explanation: Many cellular secretions are glycoproteins, in which carbohydrate groups are attached to protein molecules; examples include several hormones, enzymes, antibodies and mucus components. Nucleohistones are nuclear DNA-protein complexes and are not typical secretions. Students may choose proteins because many secretions are protein-based, but the question is emphasizing the carbohydrate-protein conjugate.

1790. Glycolipids and glycoproteins have structural role in the ______________ matrix of animal and bacterial cell?

• A. Extracellular
• B. Intracellular
• C. Both of these
• D. Glucose

Explanation: Glycolipids and glycoproteins contribute carbohydrate-containing structures to the extracellular matrix and cell surface, where they help with protection, adhesion and recognition. The likely mistake is intracellular, because these molecules are made inside cells, but the structural matrix being described lies outside the cells.