Question 1

Which of the following best defines biochemistry?

Accepted Answer

A branch of the natural sciences that deals with the study of the chemical composition and processes of cell parts in living organisms.

Question 2

Which scientist is credited with the discovery of the first enzyme, diastase (amylase), in 1833?

Accepted Answer

Anselme Payen

Question 3

Which of the following is NOT a main branch of biochemistry?

Accepted Answer

Astrobiology

Question 4

Which historical event marked the first use of DNA evidence in a criminal conviction?

Accepted Answer

The conviction of Colin Pitchfork in 1988

Question 5

Which of the following best describes the role of biochemistry in food and nutrition?

Accepted Answer

It explains the chemical reactions involved in digestion and metabolism of nutrients.

Question 6

Which equation best represents the lock-and-key model of enzyme action as described by Emil Fischer?

Accepted Answer

$$E + S \rightarrow ES \rightarrow E + P$$

Question 7

Which of the following is a significant contribution of George Beadle and Edward Tatum to biochemistry?

Accepted Answer

Demonstration that a single gene is responsible for the production of a specific enzyme

Question 8

Which foundation of biochemistry is primarily concerned with the study of energy flow and chemical processes in living organisms?

Accepted Answer

Physical foundation

Question 9

Which of the following best describes the organization of life from smallest to largest, according to biochemistry?

Accepted Answer

Atoms → Molecules → Macromolecules → Organelles → Cells → Tissues → Organs → Systems → Organisms → Population → Community → Ecosystem → Biosphere

Question 10

Which technique, developed in the mid-20th century, revolutionized the structural analysis of biological macromolecules?

Accepted Answer

X-ray diffraction

Question 11

Which of the following is a real-world application of clinical biochemistry?

Accepted Answer

Diagnosing diabetes by measuring glucose levels in blood

Question 12

Which scientist first synthesized an organic compound (urea) from inorganic components, marking a milestone in biochemistry?

Accepted Answer

Wöhler

Question 13

Which of the following best describes the main focus of structural biochemistry?

Accepted Answer

Understanding the chemical architecture of biological macromolecules such as proteins and nucleic acids

Question 14

Which of the following discoveries is correctly matched with its scientist?

Accepted Answer

Discovery of DNA polymerase – Kornberg

Question 15

Which of the following is a key concept in the genetic foundation of biochemistry?

Accepted Answer

Genetic information and continuity of life

Question 16

Which of the following best describes the role of bioinformatics in modern biochemistry?

Accepted Answer

It integrates information technology to analyze and interpret biological data, such as DNA sequences.

Question 17

Which of the following is an example of a xenobiotic?

Accepted Answer

Snake venom

Question 18

Which equation best represents the semi-conservative replication of DNA as confirmed by Meselson and Stahl?

Accepted Answer

$$DNA_{parent} \rightarrow DNA_{parent} + DNA_{new}$$

Question 19

Which of the following is a direct application of enzymology in medicine?

Accepted Answer

Using restriction enzymes to cut DNA for gene therapy

Question 20

Which of the following statements about the scope of biochemistry is correct?

Accepted Answer

Biochemistry integrates cellular, physical, chemical, and genetic foundations to address biological and medical problems.

Introduction to Biochemistry: Foundations, History, and Scope

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