Carbohydrates are composed of carbon, hydrogen, and oxygen in a 1:2:1 ratio.

• True

• False

Which of the following best describes dehydration reactions?

• They break polymers into monomers.

• They assemble monomers into polymers.

• They eliminate water from biological systems entirely.

• They only occur in lipids.

Which molecule type is primarily responsible for energy storage in plants?

• Chitin

• Glycogen

• Starch

• Cellulose

Glycogen has more branching in its structure than starch.

• True

• False

Which property of lipids makes them insoluble in water?

• Polar C-H bonds

• Hydrophilic phosphate groups

• Nonpolar C-H bonds

• Short carbon chains

Saturated fats contain one or more double bonds in their carbon chains.

• True

• False

To maintain fluidity at room temperature, lipids should have:

• A high number of trans double bonds

• A long carbon chain

• A high number of cis double bonds

• More hydrophilic heads

Phospholipids have both hydrophilic and hydrophobic properties.

• True

• False

What level of protein structure involves peptide bonds connecting amino acids in a sequence without the presence of hydrogen bonding?

• Primary structure

• Secondary structure

• Tertiary structure

• Quaternary structure

Which molecule type is found in both DNA and RNA?

• Phosphate group

• Ribose sugar

• Uracil base

• Double-stranded helix