Welcome to the Biological Molecules MDCAT MCQs with Answers. In this post, we have shared Biological Molecules Multiple Choice Questions and Answers for PMC MDCAT 2024. Each question in MDCAT Biology offers a chance to enhance your knowledge regarding Biological Molecules MCQs in this MDCAT Online Test.
Which type of biological molecule includes enzymes and antibodies?
a) Carbohydrates
b) Lipids
c) Proteins
d) Nucleic acids
What is the primary function of carbohydrates in animals?
a) Genetic information storage
b) Long-term energy storage
c) Immediate energy supply
d) Structural support
Which molecule is known for its role in storing and transmitting genetic information?
a) Carbohydrates
b) Proteins
c) Lipids
d) Nucleic acids
What type of bond connects the monomers in a carbohydrate chain?
a) Hydrogen bond
b) Ionic bond
c) Glycosidic bond
d) Peptide bond
Which of the following is a major component of the cell membrane?
a) Proteins
b) Carbohydrates
c) Nucleic acids
d) Lipids
What is the monomer unit of proteins?
a) Nucleotide
b) Amino acid
c) Monosaccharide
d) Fatty acid
Which type of biological molecule is characterized by a hydrophobic nature?
a) Carbohydrates
b) Proteins
c) Lipids
d) Nucleic acids
Which of the following is a polysaccharide?
a) Glucose
b) Sucrose
c) Glycogen
d) Fructose
Which type of biological molecule includes enzymes that speed up chemical reactions?
a) Carbohydrates
b) Proteins
c) Lipids
d) Nucleic acids
What is the basic unit of nucleic acids?
a) Monosaccharide
b) Amino acid
c) Nucleotide
d) Fatty acid
Which molecule provides the main source of energy for cellular activities?
a) Carbohydrates
b) Lipids
c) Proteins
d) Nucleic acids
What is the function of lipids in cells?
a) Store genetic information
b) Provide energy and form cell membranes
c) Act as enzymes
d) Store and transport nutrients
Which type of carbohydrate is known as a simple sugar?
a) Polysaccharide
b) Disaccharide
c) Monosaccharide
d) Glycogen
Which of the following is a component of RNA but not DNA?
a) Thymine
b) Uracil
c) Deoxyribose
d) Ribose
What type of lipid is found in cell membranes and helps form the lipid bilayer?
a) Triglycerides
b) Phospholipids
c) Steroids
d) Waxes
Which biological molecule contains the genetic code for protein synthesis?
a) Proteins
b) Carbohydrates
c) Lipids
d) Nucleic acids
Which of the following is an example of a structural protein?
a) Insulin
b) Hemoglobin
c) Collagen
d) Enzyme
What type of bond holds together the fatty acids and glycerol in triglycerides?
a) Hydrogen bond
b) Ionic bond
c) Ester bond
d) Peptide bond
Which of the following is a function of proteins in the body?
a) Store energy
b) Provide structural support
c) Store genetic information
d) Serve as signaling molecules
What is the role of nucleotides in nucleic acids?
a) Energy storage
b) Structural support
c) Genetic information storage
d) Enzyme activity
Which type of biological molecule is used for quick energy release in cells?
a) Carbohydrates
b) Lipids
c) Proteins
d) Nucleic acids
What is the primary structure of a protein determined by?
a) The sequence of nucleotides
b) The sequence of amino acids
c) The folding pattern of the polypeptide chain
d) The bonding between amino acids
Which of the following is not a function of carbohydrates?
a) Immediate energy supply
b) Long-term energy storage
c) Genetic information storage
d) Structural support
What is the function of triglycerides in the body?
a) Store genetic information
b) Provide energy and insulation
c) Act as catalysts
d) Transport nutrients
Which component of nucleotides varies between different nucleic acids?
a) Phosphate group
b) Sugar molecule
c) Nitrogenous base
d) Amino group
What is the role of enzymes in metabolic reactions?
a) Speed up reactions
b) Provide structural support
c) Store genetic information
d) Transport substances
Which of the following is a characteristic of saturated fatty acids?
a) Contains double bonds
b) Liquid at room temperature
c) Found in animal fats
d) Contains only single bonds
What type of biological molecule is glycogen?
a) Protein
b) Carbohydrate
c) Lipid
d) Nucleic acid
Which molecule is known for its role in the synthesis of proteins?
a) DNA
b) RNA
c) ATP
d) Lipids
What is the main function of lipids in the cell membrane?
a) Energy storage
b) Provide structural support
c) Form a barrier to separate cell contents from the environment
d) Store genetic information
Which of the following is an example of a disaccharide?
a) Sucrose
b) Cellulose
c) Starch
d) Glycogen
Which type of biological molecule is characterized by having a hydrophilic “head” and a hydrophobic “tail”?
a) Carbohydrates
b) Proteins
c) Nucleic acids
d) Phospholipids
Which biological molecule is composed of long chains of nucleotides?
a) Proteins
b) Carbohydrates
c) Nucleic acids
d) Lipids
Which class of biological molecules includes enzymes, antibodies, and hormones?
a) Carbohydrates
b) Proteins
c) Lipids
d) Nucleic acids
Which component of an amino acid varies between different amino acids?
a) Amino group
b) Carboxyl group
c) Hydrogen atom
d) R group (side chain)
Which type of biological molecule is primarily used for energy storage in plants?
a) Starch
b) Glycogen
c) Cellulose
d) Chitin
What is the main role of cellulose in plants?
a) Store energy
b) Provide structural support
c) Act as a catalyst
d) Transport nutrients
Which biological molecule is involved in the energy transfer within cells?
a) Carbohydrates
b) ATP
c) Lipids
d) Proteins
Which of the following is a property of enzymes?
a) They are consumed in reactions
b) They increase the activation energy of reactions
c) They are specific to substrates
d) They perform their function in high concentrations
Which type of lipid is most commonly used for energy storage?
a) Phospholipids
b) Triglycerides
c) Steroids
d) Waxes
Which type of carbohydrate is found in DNA and RNA?
a) Glucose
b) Ribose
c) Fructose
d) Sucrose
What is the primary structural component of the fungal cell wall?
a) Cellulose
b) Chitin
c) Starch
d) Glycogen
Which biological molecule is involved in the transport of oxygen in the blood?
a) Hemoglobin
b) Insulin
c) Collagen
d) Myelin
Which of the following molecules is an energy carrier in cells?
a) DNA
b) RNA
c) ATP
d) Cellulose
What type of biological molecule is glycogen?
a) Carbohydrate
b) Protein
c) Lipid
d) Nucleic acid
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