Nutritional Biochemistry Structures Quiz

Which of the following is a standard representation of an amino acid?

• A hexagonal ring with red and gray bonds

• A structure with a central carbon, an amino group, and a carboxyl group

• A long chain of carbon and hydrogen atoms

• A structure with a phosphate group, sugar, and nitrogenous base

Which molecule is typically involved in forming the backbone of DNA?

• Amino acid

• Sugar

• Nucleotide

• Lipid

What are the monomers of carbohydrates?

• Amino acids

• Fatty acids

• Monosaccharides

• Nucleotides

What are the monomers of lipids?

• Fatty acids and glycerol

• Amino acids

• Monosaccharides

• Nucleotides

What is the significance of carbon in the ancestry of living organisms?

• All living organisms are descended from a common ancestor containing carbon

• Carbon is only found in extinct species

• Carbon is not present in any living organisms

• Carbon is only found in plants

How many electrons does carbon have on its outermost shell?

• 2

• 4

• 6

• 8

What is the significance of carbon having 4 electrons in its outer shell?

• It can form up to 2 chemical bonds.

• It can form up to 4 chemical bonds.

• It cannot form any chemical bonds.

• It can form up to 6 chemical bonds.

Why is carbon important for biological compounds?

• It acts as a backbone for all organic molecules.

• It is the heaviest element.

• It does not form any bonds.

• It is a rare element.

Which of the following is a characteristic of organic molecules?

• They do not contain carbon.

• They are usually simple in structure.

• They create covalent bonds with other atoms.

• They include minerals and water.

Why is the shape of a molecule important?

• It determines the color of the molecule.

• It helps to uniquely identify the type of molecule.

• It affects the weight of the molecule.

• It changes the temperature of the molecule.