Carbs, Fats, and Proteins

The general characteristics of proteins are that they

• Serves as structural materials, energy sources and chemical messengers

• Contains C, H, O and N, and sometimes sulfur

• Can act as enzymes

An enzyme is defined as a

Protein that speeds up chemical reactions without being changed or depleted

Which of the following statements about proteins is false?

All proteins are enzymes

Which of the following defines the term specificity?

Carrier transport of a group of closely related molecules

The coiling of the protein chain into an alpha helix is referred to as the:

Secondary structure

Cholesterol, while it is not an energy molecule, has importance in the body because:

It is a stabilizing component of the plasma membrane and is the parent molecule of steroid hormones

When ketone bodies are present in the blood in large amounts, it indicated increased metabolism of

Fatty acids

The bond between amino acids is referred to as a(n):

peptide bond

Enzymes can speed up the rate of a reaction by

Lowers the activation energy of the reaction

The category of organic molecules that are nonpolar and insoluble in water are referred to as

Lipids

Carbohydrates are stored in the liver and muscles in the form of:

Glycogen

Which of the following is not true of a protein?

• Appear to be the molecular carrier of the hereditary information

• May be denatured by heat or acidity

• Function depends on its 3-dimensional shape

• Some types are called enzymes

Appear to be the molecular carrier of the hereditary information

The subunits of proteins are called

Amino acids

Which two monosaccharides bind to form sucrose?

Fructose + Glucose

A fatty acid that contains three double bonds in its carbon chain is said to be

Polyunsaturated