Unit 3.3 Review

The diagram shows the general structure of an amino acid. Which type of molecule is formed from amino acids?

• lipids

• carbohydrates

• proteins

• nucleic acids

Fats, oils and cholesterol are all types of what?

• cell membranes

• hormones

• fatty acids

• lipids

4. RNA and DNA are which type of macromolecules?

• nucleic acid

• lipid

• protein

• carbohydrate

The human body maintains a temperature of around 98.6 degrees at all times. Enzymes are involved in almost every chemical reaction in the body. Which of the following describes the connection between these two statements?

• Enzymes function best at a specific temperature.

• The body needs to be warm to prevent hypothermia.

• The body is kept relatively warm to prevent too much enzyme action.

• There is no connection between the two statements.

Like complex carbohydrates, proteins are macromolecules that serve many functions and can be chemically broken down and restructured. Both proteins and complex carbohydrates are which of the following?

• sequence of sugars

• polymers of smaller subunits

• lipids of large molecules

• nucleotides of DNA

In living organisms, lipids function mainly as:

• Sources of stored energy and transmitters of genetic information

• Transmitters of genetic information and catalysts of chemical reactions

• Catalysts of chemical reactions and components of cellular membranes

• Sources of stored energy and components of cellular membranes

Carbohydrates are made of monomers called ___________

• monosaccharides

• nucleotides

• amino acids

• fatty acids

The element _______is found in all of the organic compounds.

• oxygen

• carbon

• hydrogen

• nitrogen

Nucleotides are monomers of

• carbohydrates

• lipids

• proteins

• nucleic acids

Fatty acids are the monomers of

• carbohydrates

• proteins

• lipids

• nucleic acids