Chemistry

Which of these is the smallest unit of living things?

• cells
• atoms 
• molecules
• compounds

Zane is making a chart of compounds that are found in the human body. What is the most common compound found in the human body?

• H2O   
• CO2
• Sodium Bicarbonate (baking soda)
• NaCl (table Salt)

Kayla has a cat with blue eyes. The color of her cat’s eyes is determined by deoxyribonucleic acid (DNA). The DNA directs which substance to construct these eyes?

• lipids
• water
• proteins
• carbohydrates

Carbohydrates are made up of three of the six major molecules found in living things. The general chemical formula for a carbohydrate is CH₂O. Which elements combine to make a carbohydrate?

• copper and cobalt
• chlorine and oxygen
• carbon, helium, and oxygen
• carbon, hydrogen, and oxygen

When people eat foods high in proteins, such as meat, eggs and cheese, the body breaks down the proteins into smaller molecules. What is supplied to cells when the body breaks down proteins?

• amino acids
• nucleic acids
• phospholipids
• carbohydrates