BIO 9A - Biomolecule Functions

The differences between two molecules include the type of sugar that forms a section of the molecules and the identity of one of the four nitrogenous bases that make up another section of the molecules. These two molecules are —

• proteins

• lipids

• nucleic acids

• complex carbohydrates

The complex carbohydrates pictured below are made by linking molecules of glucose.

In all three complex carbohydrates, the subunits of glucose are bonded together differently. Because they have different structures, they most likely —

• contain different chemical elements

• form different proteins

• carry different nucleotides

• perform different functions

An advertisement for a health supplement for dogs claims to build lean muscle and strengthen tendons and ligaments, as well as provide energy. Which two biomolecules must the supplement contain to provide these benefits?

• Carbohydrates and lipids

• Proteins and carbohydrates

• Nucleic acids and carbohydrates

• Lipids and nucleic acids

Two biomolecules are shown.

Which of the following best describes these biomolecules?

• Molecule X and Molecule Y are both carbohydrates.

• Molecule X is a nucleic acid, and Molecule Y is a carbohydrate.

• Molecule X and Molecule Y are both nucleic acids.

• Molecule X is a carbohydrate, and Molecule Y is a nucleic acid.

Macromolecules which are both hydrophobic and hydrophilic and are a major component of cell membranes are –

• polysaccharides

• proteins

• phospholipids

• inorganic

Which of the following is not a lipid?

• steroid

• cholesterol

• wax

• cellulose

Which biomolecule do living organisms use as energy storage?

• carbohydrates

• lipids

• protein

• nucleic acid

Many land plants store energy in starch. When energy is needed, the starch molecules can be broken down quickly. Starch is which of the following molecules?

• amino acid

• lipid

• polysaccharide

• RNA chain

Beeswax is a waxy substance that is produced by bees and then harvested by humans for a variety of uses. Ancient Romans used beeswax as a waterproofing agent because it is not water-permeable. Beeswax is which of the following types of organic molecule?

• carbohydrate

• lipid

• nucleic acid

• protein

Which of the following macromolecules are a prominent part of animal tissues that function in insulation, helping animals conserve heat?

• carbohydrates

• lipids

• proteins

• nucleic acids