What makes water a polar molecule?

• It is a large molecule.

• It has a positive end and a negative end.

• It contains carbon and hydrogen.

• It has an equal sharing of electrons.

What is the significance of hydrogen bonds in water?

• They decrease water's boiling point.

• They cause water to repel other molecules.

• They enable water molecules to stick together.

• They make water nonpolar.

Which of the following is NOT a property of macromolecules?

• They include carbohydrates and proteins.

• They are always nonpolar.

• They are made of repeating subunits.

• They are organic molecules.

What is the monomer of carbohydrates?

• Amino acids

• Nucleotides

• Fatty acids

• Glucose

Which of the following is a function of carbohydrates?

• Immediate energy source

• Speeding up chemical reactions

• Forming cell membranes

• Storing genetic information

Why are lipids important in biological systems?

• They are soluble in water.

• They are polar molecules.

• They form the cell membrane.

• They are the primary source of immediate energy.

Why do lipids not mix with water?

• Because of their high density

• Because they are polar molecules

• Because they are nonpolar and water is polar

• Because they are smaller than water molecules

What distinguishes proteins from other macromolecules?

• They contain phosphorus.

• They are made of nucleotides.

• They include nitrogen in their structure.

• They are made exclusively of glucose.

What role do nucleic acids play in cells?

• They control cell activities and hereditary information.

• They form the cell membrane.

• They provide immediate energy.

• They act as long-term energy storage.

What is the role of enzymes in biological reactions?

• They speed up chemical reactions without being consumed.

• They store genetic information.

• They decrease the rate of chemical reactions.

• They act as a structural component of cells.