Question 1

Which property of carbon allows it to form large, complex molecules essential for life?

Accepted Answer

It can form four covalent bonds with a variety of atoms, enabling molecular diversity.

Question 2

A dehydration reaction is crucial in the synthesis of which biological macromolecule?

Accepted Answer

Proteins, by linking amino acids together through the removal of a water molecule

Question 3

Which of the following best describes the structure and function of saturated fatty acids?

Accepted Answer

They contain only single bonds between carbons, are solid at room temperature, and are found in animal fats.

Question 4

Which of the following statements about ATP is correct?

Accepted Answer

ATP consists of adenosine attached to three phosphate groups and releases energy when hydrolyzed.

Question 5

A scientist is studying a molecule composed of carbon, hydrogen, oxygen, and nitrogen. It is a polymer made of monomers linked by peptide bonds. What type of macromolecule is this?

Accepted Answer

Protein

Question 6

Which of the following best explains why phospholipids form bilayers in water?

Accepted Answer

Their hydrophilic heads face the aqueous environment, while hydrophobic tails face inward, away from water.

Question 7

Which of the following is NOT a function of proteins within cells?

Accepted Answer

Storing genetic information

Question 8

A DNA molecule is composed of two strands running in opposite directions. What is the term for this arrangement, and what type of bonds hold the two strands together?

Accepted Answer

Antiparallel; hydrogen bonds

Question 9

Which of the following best describes the difference between hydrolysis and dehydration synthesis?

Accepted Answer

Hydrolysis breaks polymers into monomers by adding water, while dehydration synthesis joins monomers by removing water.

Question 10

Which of the following base pairs is found in RNA but not in DNA?

Accepted Answer

Adenine - Uracil

Question 11

A mutation changes a single amino acid in the primary structure of a protein. Which levels of protein structure could potentially be affected as a result?

Accepted Answer

Primary, secondary, tertiary, and quaternary structures

Question 12

Which of the following statements about polysaccharides is correct?

Accepted Answer

They function as energy storage and structural components in cells.

Question 13

Which of the following best explains why enzymes are essential for life?

Accepted Answer

They speed up chemical reactions without being consumed in the process.

Question 14

A triglyceride is formed by the reaction of which components?

Accepted Answer

Three fatty acids and one glycerol molecule via dehydration synthesis

Question 15

Which of the following best describes the directionality of a DNA strand?

Accepted Answer

It has a 5' end with a phosphate group and a 3' end with a hydroxyl group.

Question 16

Which of the following functional groups is found in all amino acids and is responsible for their acidic properties?

Accepted Answer

Carboxyl group ($$-COOH)$$

Question 17

A patient is diagnosed with a genetic disorder that affects the enzyme responsible for breaking down glycogen. Which process is directly impaired in this patient?

Accepted Answer

Hydrolysis of polysaccharides for energy release

Question 18

Which of the following best explains why unsaturated fatty acids are liquid at room temperature?

Accepted Answer

They contain one or more double bonds, creating kinks that prevent tight packing.

Question 19

Which of the following is a correct complementary base pair in DNA?

Accepted Answer

Guanine - Cytosine

Question 20

A protein is exposed to high heat and extreme pH, causing it to lose its 3D structure. What is this process called, and what is the likely result?

Accepted Answer

Denaturation; the protein will lose its biological function.

General Biology: Structure and Function of Biological Macromolecules

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