Understanding Biological Molecules

What are biological molecules essential for?

• Forming minerals and rocks

• Generating electricity

• Creating water and air

• Building cells and living organisms

What elements make up carbohydrates?

• Carbon, hydrogen, and phosphorus

• Carbon, hydrogen, and oxygen

• Carbon, oxygen, and nitrogen

• Hydrogen, oxygen, and sulfur

Which molecule is primarily used by our bodies for energy?

• Lipids

• Proteins

• Carbohydrates

• Nucleic acids

What are lipids made of?

• Amino acids

• Glycerol and fatty acids

• Nucleotides

• Monosaccharides

What is the primary role of proteins in the body?

• Oxygen transport

• Energy storage

• Water balance

• Growth and repair

How can you test for the presence of starch in food?

• Benedict's solution

• Iodine solution

• Biuret solution

• Ethanol test

What color does iodine turn if starch is present?

• Yellow

• Red

• Green

• Blue-black

What indicates the presence of glucose in the Benedict's test?

• Turns green to brick red depending on concentration

• Turns purple

• Remains colorless

• Turns blue

What does the Biuret solution test for?

• Proteins

• Glucose

• Starch

• Lipids

What result indicates lipids are present in the ethanol test?

• Red precipitate

• Colorless solution

• Cloudy white emulsion

• Blue solution