Question 1

Which of the following statements best explains why lipids are not considered true polymers?

Accepted Answer

Lipids are formed from smaller molecules but do not consist of repeating monomer units.

Question 2

A dehydration reaction is crucial in the synthesis of biological macromolecules. Which equation correctly represents the dehydration reaction between two glucose molecules to form maltose?

Accepted Answer

$$C_6H_{12}O_6$ + C_6H_{12}O_6$ \rightarrow C$$_{12}$$H_{22}O$$_{11} + H_2O$

Question 3

Which of the following best describes the difference between starch and cellulose?

Accepted Answer

Starch is composed of $$\alpha$$ glucose monomers with helical structure, while cellulose is composed of $$\beta$$ glucose monomers with straight, unbranched structure.

Question 4

Which of the following is NOT a function of proteins in living organisms?

Accepted Answer

Storing hereditary information

Question 5

A patient is diagnosed with sickle-cell disease. Which molecular change is responsible for this condition?

Accepted Answer

A single amino acid substitution in the primary structure of hemoglobin

Question 6

Which of the following correctly describes the structure of a phospholipid and its behavior in water?

Accepted Answer

Phospholipids have two hydrophobic tails and a hydrophilic head, forming bilayers in water.

Question 7

Which of the following is a correct statement about the linkage that joins nucleotides in a polynucleotide chain?

Accepted Answer

Nucleotides are joined by phosphodiester linkages between the phosphate group of one nucleotide and the sugar of the next.

Question 8

Which of the following best explains why animal fats are solid at room temperature while plant oils are liquid?

Accepted Answer

Animal fats contain saturated fatty acids with no double bonds, allowing molecules to pack closely together.

Question 9

Which of the following is a correct sequence for the flow of genetic information in a cell?

Accepted Answer

$$DNA \rightarrow RNA \rightarrow Protein$$

Question 10

A scientist is studying the effect of temperature on protein structure. Which term describes the loss of a protein's native structure due to environmental changes?

Accepted Answer

Denaturation

Question 11

Which of the following is a structural polysaccharide found in the exoskeleton of arthropods and the cell walls of fungi?

Accepted Answer

Chitin

Question 12

Which of the following correctly matches the macromolecule with its monomer?

Accepted Answer

Nucleic acid — Nucleotide

Question 13

Which of the following is true about the secondary structure of proteins?

Accepted Answer

It consists of $$\alpha-$$helices and $$\beta-$$pleated sheets stabilized by hydrogen bonds.

Question 14

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

Accepted Answer

A covalent bond formed between two monosaccharides during a dehydration reaction.

Question 15

Which of the following is a purine found in nucleic acids?

Accepted Answer

Adenine

Question 16

Which of the following best explains the role of enzymes in the synthesis and breakdown of polymers?

Accepted Answer

Enzymes are specialized macromolecules that speed up dehydration and hydrolysis reactions.

Question 17

Which of the following is a correct statement about the structure of DNA?

Accepted Answer

DNA consists of two antiparallel polynucleotide strands forming a double helix.

Question 18

Which of the following is a major function of adipose tissue in mammals?

Accepted Answer

Storing long-term energy reserves

Question 19

Which of the following correctly describes the difference between a polypeptide and a functional protein?

Accepted Answer

A polypeptide is a single linear chain of amino acids, while a functional protein may consist of one or more polypeptides precisely folded into a unique shape.

The Structure and Function of Large Biological Molecules

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