Question 1

Which of the following best describes the general structure of an amino acid?

Accepted Answer

A central carbon atom bonded to a hydrogen atom, an amine group ($$NH_2$$), a carboxyl group ($$COOH$$), and a variable R group.

Question 2

Which type of bond forms between the amine group of one amino acid and the carboxyl group of another during protein synthesis?

Accepted Answer

Peptide bond

Question 3

What is the primary structure of a protein?

Accepted Answer

The sequence of amino acids in a polypeptide chain

Question 4

Which of the following is a function of fibrous proteins?

Accepted Answer

Providing structural support to tissues such as skin and tendons

Question 5

What happens to a globular protein when it is denatured by heat?

Accepted Answer

Its hydrogen bonds are disrupted, causing it to lose its specific 3-D shape and function.

Question 6

Which of the following best describes the role of enzymes in biological reactions?

Accepted Answer

They lower the activation energy, allowing reactions to proceed more rapidly.

Question 7

A holoenzyme is composed of which of the following?

Accepted Answer

An apoenzyme and its cofactor

Question 8

Which of the following nucleotide base pairs is held together by three hydrogen bonds in DNA?

Accepted Answer

Cytosine and Guanine

Question 9

Which of the following statements about RNA is correct?

Accepted Answer

RNA is single-stranded and contains uracil instead of thymine.

Question 10

Which of the following best describes the structure of ATP?

Accepted Answer

Adenine, ribose, and three phosphate groups

Question 11

During which process is water released as a peptide bond forms between two amino acids?

Accepted Answer

Dehydration synthesis

Question 12

Which of the following is a real-life example of a globular protein and its function?

Accepted Answer

Hemoglobin transporting oxygen in the blood

Question 13

Which of the following best explains why enzymes are not consumed during chemical reactions?

Accepted Answer

Enzymes temporarily bind substrates, catalyze the reaction, and are released unchanged.

Question 14

Which of the following is NOT a component of a nucleotide?

Accepted Answer

Fatty acid chain

Question 15

Which of the following best describes the function of ATP in cells?

Accepted Answer

It acts as an energy currency, providing energy for cellular work.

Question 16

Which of the following is a correct sequence for the utilization of ATP in cellular work?

Accepted Answer

$$ATP \rightarrow ADP \rightarrow AMP$$

Question 17

A mutation causes a change in the primary structure of a protein. Which level(s) of protein structure could be affected as a result?

Accepted Answer

Primary, secondary, tertiary, and quaternary structures

Question 18

Which of the following best explains why cysteine is important for protein structure?

Accepted Answer

It contains a sulfhydryl group ($$-SH) $$that can form disulfide bonds, stabilizing tertiary structure.

Question 19

Which of the following is a correct pairing of a purine and a pyrimidine in DNA?

Accepted Answer

Adenine and Thymine

Question 20

Which of the following best describes the difference between DNA and RNA?

Accepted Answer

DNA contains deoxyribose sugar, while RNA contains ribose sugar.

Organic Compounds: Proteins, Nucleic Acids, and ATP – Chemistry Comes Alive (Chapter 2, Part 4)

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