Biological Molecules and Their Functions

This video tutorial covers the four main types of biomolecules: proteins, carbohydrates, lipids, and nucleic acids. It explains the structure, components, and functions of each macromolecule, highlighting their roles in biological processes. Proteins are discussed in terms of their R groups and functions as enzymes and hormones. Carbohydrates are described as energy sources, with examples of monosaccharides and polysaccharides. Lipids are explained as energy storage molecules, with a focus on saturated and unsaturated fats. Nucleic acids are covered in terms of DNA and RNA structure, including base pairing rules.

Which of the following is NOT a component of proteins?

• Carboxyl group

• R group

• Phosphate group

• Amino group

What is the primary function of carbohydrates in the body?

• Hormone production

• Immediate energy

• Structural support

• Enzyme activity

Which polysaccharide is found in the exoskeleton of arthropods?

• Cellulose

• Starch

• Chitin

• Glycogen

What is the main structural component of cell membranes?

• Phospholipids

• Carbohydrates

• Nucleic acids

• Proteins

Which type of fat is considered healthier and is typically liquid at room temperature?

• Hydrogenated fats

• Trans fats

• Saturated fats

• Unsaturated fats

What sugar is found in the backbone of RNA?

• Deoxyribose

• Ribose

• Glucose

• Fructose

Which nitrogenous base is found in RNA but not in DNA?

• Cytosine

• Uracil

• Thymine

• Adenine

According to Chargaff's rule, if guanine is 20% of the DNA, what percentage is adenine?

• 20%

• 30%

• 40%

• 50%

Which element is NOT typically found in carbohydrates?

• Nitrogen

• Hydrogen

• Oxygen

• Carbon

What distinguishes proteins from nucleic acids in terms of elemental composition?

• Presence of oxygen

• Presence of nitrogen

• Presence of hydrogen

• Presence of sulfur