Exploring Carbohydrates, Lipids, and Proteins in IB Biology

The video tutorial covers the basics of organic and inorganic compounds, focusing on carbon's role. It explains macromolecules like proteins, carbohydrates, lipids, and nucleic acids, detailing their structures and functions. Lipids are discussed in terms of energy storage, insulation, and buoyancy. Carbohydrates are explored through their types, digestion, and storage as glycogen, with emphasis on their roles in plants and animals. The tutorial also highlights the importance of glucose and insulin in energy regulation.

Which of the following is considered an inorganic substance?

• Carbon dioxide

• Glucose

• Protein

• Starch

What are the building blocks of proteins?

• Nucleotides

• Monosaccharides

• Amino acids

• Fatty acids

Which macromolecule is primarily found in the bun and vegetables of a burger?

• Proteins

• Lipids

• Nucleic acids

• Carbohydrates

What are lipids made up of?

• Glycerol and fatty acids

• Monosaccharides

• Nucleotides

• Amino acids

Which of the following is NOT a function of lipids?

• Transport of oxygen

• Buoyancy

• Heat insulation

• Energy storage

Why are fats harder to digest compared to carbohydrates?

• They are nonpolar and do not dissolve well in water

• They contain more energy

• They are stored in the liver

• They are larger molecules

What is the primary function of glucose in animals?

• Buoyancy

• Main source of energy

• Energy storage

• Heat insulation

Which hormone helps in lowering blood sugar levels by storing excess glucose as glycogen?

• Thyroxine

• Glucagon

• Insulin

• Adrenaline

What is the main storage carbohydrate in animals?

• Sucrose

• Cellulose

• Starch

• Glycogen

Which disaccharide is found in milk and can cause intolerance in some people?

• Maltose

• Fructose

• Sucrose

• Lactose