Question 1

Why is carbon considered the ideal element for forming the backbone of biological macromolecules?

Accepted Answer

Because carbon has four valence electrons, allowing it to form four stable covalent bonds and create diverse molecular structures.

Question 2

Which chemical group is responsible for making monosaccharides reactive and hydrophilic?

Accepted Answer

Carbonyl group $$(\u003eC=O)$$ and hydroxyl group $$(-OH)$$

Question 3

During the synthesis of a biological polymer, which molecule is produced as a byproduct?

Accepted Answer

Water $$H_2O$$

Question 4

Which of the following best describes a dehydration reaction?

Accepted Answer

A reaction that synthesizes polymers by removing a water molecule.

Question 5

Which property allows amphipathic molecules to form bilayer vesicles in water?

Accepted Answer

They contain both hydrophilic and hydrophobic regions.

Question 6

Which of the following is NOT considered a lipid?

Accepted Answer

Glucose

Question 7

What is the main function of polysaccharides such as starch and glycogen in living organisms?

Accepted Answer

Energy storage

Question 8

Which of the following statements about protein structure is correct?

Accepted Answer

Secondary structure involves hydrogen bonding between backbone atoms, forming alpha helices and beta sheets.

Question 9

Amino acids are classified based on the properties of their R group. Which amino acid would be classified as polar?

Accepted Answer

Serine, with an R group of $$-CH_2OH$$

Question 10

Which of the following is a correct description of the difference between DNA and RNA?

Accepted Answer

DNA contains thymine, while RNA contains uracil.

Question 11

Which type of chemical bond is primarily responsible for stabilizing the secondary structure of proteins?

Accepted Answer

Hydrogen bonds

Question 12

What is the monomer unit of nucleic acids?

Accepted Answer

Nucleotide

Question 13

Which of the following best explains why nonpolar molecules are hydrophobic?

Accepted Answer

They do not interact favorably with water molecules due to lack of charge or polarity.

Question 14

Which of the following is true about the formation of peptide bonds?

Accepted Answer

Peptide bonds are formed by dehydration synthesis between the amino group of one amino acid and the carboxyl group of another.

Question 15

Which of the following is a function of proteins in living organisms?

Accepted Answer

Catalyzing chemical reactions as enzymes

Question 16

Which of the following statements about the structure of DNA is correct?

Accepted Answer

DNA strands are antiparallel and held together by hydrogen bonds between complementary bases.

Question 17

Which of the following is a correct statement about the difference between fats and phospholipids?

Accepted Answer

Phospholipids contain a phosphate group and two fatty acids, while fats contain three fatty acids and no phosphate group.

Question 18

Which of the following is a correct description of a glycosidic linkage?

Accepted Answer

A covalent bond formed between two monosaccharides during dehydration synthesis.

Question 19

Which of the following best describes the tertiary structure of a protein?

Accepted Answer

The overall 3D shape of a polypeptide resulting from interactions between side chains.

Carbon and Biological Macromolecules: Structure, Function, and Chemistry

Study Guide - Practice Questions