Free Biological Molecules MCQs with Answers
1,790 Biological Molecules MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
The chapter covers water's polarity and biological roles, carbohydrates, lipids, proteins and nucleic acids, including their monomers, bonds, structures and functions. It also distinguishes RNA from DNA and explains conjugated molecules such as glycoproteins, glycolipids and nucleoproteins, which combine organic molecules with a non-protein component.
Last updated
1,790 questions · page 46 of 90
- A. 0.8%
- B. 0.08%
- C. 0.06%
- D. 6%
Explanation: The correct answer is 0.08%. Blood plasma typically contains about 0.08% glucose, which is crucial for providing energy to cells.
Correct answer: 0.08%- A. Cellulose
- B. Glycogen
- C. Wax
- D. Protein
Explanation: Cotton is composed almost entirely of cellulose, a complex carbohydrate that forms the structural component of plant cell walls.
Correct answer: Cellulose903. Select the one which show characteristics like polymer of beta glucose, 1,4 glycosidic linkage?
- A. Glycogen
- B. Amylopectin
- C. Cellulose
- D. Amylose
Explanation: The correct answer is Cellulose. Cellulose is a linear polymer composed of β-glucose units linked by β-1,4 glycosidic bonds, which…
Correct answer: Cellulose- A. α-glucose
- B. β-glucose
- C. D-glucose
- D. L-glucose
Explanation: The correct answer is α-glucose. In the Haworth projection of glucopyranose, if the hydroxyl group attached to the anomeric carbon (carbon…
Correct answer: α-glucose- A. One
- B. Two
- C. Three
- D. None
Explanation: The term 'dipeptide' indicates that the molecule is composed of two amino acids linked by a single peptide bond.
Correct answer: One906. It is not fibrous:
- A. Haemoglobin
- B. Myosin
- C. Silk
- D. Fibrin
Explanation: The correct answer is Haemoglobin. Haemoglobin is a globular protein, characterized by its compact and spherical structure, which is…
Correct answer: Haemoglobin- A. Keratin
- B. Albumin
- C. Dehydrogenases
- D. Rubisco
Explanation: Rubisco is the most abundant protein on Earth because it is essential for photosynthesis in plants, algae, and some bacteria.
Correct answer: Rubisco- A. Fibril proteins
- B. Globular proteins
- C. Fibrous proteins
- D. Tough proteins
Explanation: Globular proteins are characterized by their spherical shape due to their tertiary and quaternary structures.
Correct answer: Globular proteins- A. Glycoproteins
- B. Phospholipids
- C. Glycolipids
- D. Sphingolipids
Explanation: The correct answer is glycoproteins. Blood group antigens are mainly composed of glycoproteins, which include protein structures linked…
Correct answer: Glycoproteins- A. Lipids
- B. Proteins
- C. Carbohydrates
- D. Nucleic acids
Explanation: Proteins make up over 50% of the dry weight of cells because they are involved in nearly every cell function, including serving as…
Correct answer: Proteins- A. 51
- B. 50
- C. 49
- D. 48
Explanation: The number of peptide bonds in a protein is determined by subtracting the number of polypeptide chains from the total number of amino…
Correct answer: 49912. Spider's web is a:
- A. Globular protein
- B. Functional protein
- C. Fibrous protein
- D. Soluble protein
Explanation: The correct answer is 'Fibrous protein'. Spider silk is a fibrous protein, characterized by its strong and elongated structure, which is…
Correct answer: Fibrous protein- A. Palmitic acid
- B. Linoleic acid
- C. Oleic acid
- D. Erucic acid
Explanation: Palmitic acid is a saturated fatty acid as it contains no double bonds between carbon atoms.
Correct answer: Palmitic acid- A. mRNA
- B. rRNA
- C. snRNA
- D. tRNA
Explanation: Ribosomal RNA (rRNA) is the correct answer because it is a fundamental structural component of ribosomes, where it forms a significant…
Correct answer: rRNA- A. RNA, DNA, Nucleus
- B. RNA, Nucleus, DNA
- C. DNA, RNA, Nucleus
- D. Nucleus, RNA, DNA
Explanation: The correct answer is that all three types of RNA (mRNA, tRNA, and rRNA) are synthesized from DNA in the nucleus.
Correct answer: RNA, DNA, Nucleus- A. rRNA
- B. tRNA
- C. mRNA
- D. snRNA
Explanation: Ribosomal RNA (rRNA) is the most abundant form of RNA in the cell. It forms the core structural and functional components of ribosomes…
Correct answer: rRNA- A. Alanine
- B. Glycine
- C. Leucine
- D. Valine
Explanation: The correct answer is Glycine. Glycine is the simplest amino acid because its R group is a single hydrogen atom.
Correct answer: Glycine- A. Hydroxyl group
- B. Amino group
- C. Aldehydic group
- D. Aldehydic group and Ketonic group
Explanation: A hydroxyl group is a functional group (-OH) consisting of an oxygen atom covalently bonded to a hydrogen atom.
Correct answer: Hydroxyl group- A. Ribose
- B. Erythrose
- C. Glucoheptose
- D. Galactose
Explanation: The correct answer is Galactose. Galactose is a monosaccharide that contains six carbon atoms, classifying it as a hexose.
Correct answer: Galactose- A. They are lighter than water
- B. They contain double bonds
- C. They are usually solid at room temperature
- D. Their specific gravity is less than one
Explanation: Fats containing unsaturated fatty acids are generally liquid at room temperature because the double bonds introduce kinks in the fatty…
Correct answer: They are usually solid at room temperature