A cell membrane has a double layer of molecules. These molecules are made up of a phosphorus-containing “head” and two long, fatty acid “tails.”

Which of the following best explains why the molecules are classified as lipids?

• They contain phosphorus.

• They form a double layer.

• They are made up of fatty acids.

• They are found in the cell membrane.

When proteins are broken down, phenylalanine is sometimes produced. Phenylalanine contains the elements carbon, nitrogen, hydrogen, and oxygen.

Phenylalanine is which type of compound?

• Amino acid

• Lipid

• Fatty Acid

• Monosaccharide

Tags

NGSS.HS-LS1-6

Maltose is a carbohydrate molecule that provides energy to plants early in their life cycle. Which elements are most common in a molecule of maltose?

• carbon and hydrogen

• iron and zinc

• phosphorus and iron

• potassium and zinc

Tags

NGSS.MS-PS1-1

What is the monomer for lipid?

• Amino acid

• Fatty acid

• Monosaccharide

• Nucleic acid

What is the monomer for proteins

• Amino acid

• Fatty acid

• Monosaccharide

• Nucleic acid

Tags

NGSS.HS-LS1-6

What is the monomer for carbohydrates?

• Amino acid

• Fatty acid

• Monosaccharides

• Nucleotides

What is the monomer for nucleic acids?

• Amino acid

• Fatty acid

• Monosaccharide

• Nucleotides

Some bacteria produce cellulase, a substance that speeds up the breakdown of cellulose in plant cell walls. Cellulase is an example of which of the following?

• carbohydrate

• enzyme

• hormone

• organelle

Diatoms are marine organisms with unique cell walls that contain the element silicon. Which of the following are two common elements found in the cells of diatoms?

• aluminum and magnesium

• helium and hydrogen

• mercury and neon

• nitrogen and phosphorus

What is the most important element for life?

• Hydrogen

• Carbon

• Oxygen

• Nitrogen