Question 1

Which of the following statements best explains why carbon is the chemical foundation of life rather than silicon?

Accepted Answer

Carbon-to-carbon bonds are stronger and more stable, and carbon-based molecules release more energy upon combustion.

Question 2

A researcher synthesizes a drug with two chiral centers, resulting in four stereoisomers. Why is it important to test each isomer separately in biological systems?

Accepted Answer

Stereoisomers may have identical chemical properties but can have distinct biological activities, including toxicity.

Question 3

Which functional group is most likely to exist in different protonation states at physiological pH, affecting the charge and reactivity of biomolecules?

Accepted Answer

Carboxyl group ($$\mathrm{COOH}$$ and $$\mathrm{COO^-})$$

Question 4

Which of the following best describes the difference between conformation and configuration in biomolecules?

Accepted Answer

Configuration refers to the fixed spatial arrangement of atoms (due to double bonds or chiral centers), while conformation is the flexible arrangement that can change without breaking covalent bonds.

Question 5

Which of the following is a correct application of the First Law of Thermodynamics in cellular biology?

Accepted Answer

Cells convert energy from nutrients or sunlight into work, heat, or complex biomolecules, but the total energy remains constant.

Question 6

Given the equation for Gibbs free energy $$\Delta G = \Delta H - T \Delta S$$, which scenario describes a spontaneous reaction in a cell?

Accepted Answer

A reaction where $$\Delta G \u003c 0$$, releasing free energy that can be used to do work.

Question 7

Which of the following best illustrates energy coupling in biological systems?

Accepted Answer

An exergonic reaction is used to drive an endergonic reaction, so the overall $$\Delta G is $$negative.

Question 8

Which statement about ATP is correct?

Accepted Answer

ATP serves as a universal energy currency, linking catabolic and anabolic reactions.

Question 9

A mutation in DNA changes a single nucleotide in a gene. Which of the following best describes the possible consequence?

Accepted Answer

The mutation may change the amino acid sequence, potentially altering protein structure and function, which can affect phenotype.

Question 10

Which of the following is a major difference between prokaryotic and eukaryotic cells?

Accepted Answer

Eukaryotic cells are generally larger and have specialized organelles for distinct functions.

Question 11

Which of the following best describes the structure-function relationship in biomolecules?

Accepted Answer

The structure of a biomolecule dictates its function, allowing prediction of molecular activity and disease mechanisms.

Question 12

Which of the following is NOT a major class of biomolecule found in living organisms?

Accepted Answer

Minerals

Question 13

Which of the following statements about the central dogma of biochemistry is correct?

Accepted Answer

Genetic information flows from DNA to RNA to protein.

Question 14

Which of the following best explains the evolutionary concept illustrated by the 'Ship of Theseus' analogy?

Accepted Answer

Despite constant molecular turnover, the identity of an organism is maintained through continuity of genetic information and organization.

Question 15

Which of the following is a consequence of the Second Law of Thermodynamics for living systems?

Accepted Answer

Living systems maintain high organization locally, but the total entropy of the universe increases.

Question 16

Which of the following is true regarding the stereospecificity of biochemistry?

Accepted Answer

Proteins are built exclusively from L-amino acids, and biomolecular interactions are highly stereospecific.

Question 17

Which of the following is a real-world example of the importance of stereochemistry in drug safety?

Accepted Answer

Thalidomide's two chiral forms have different biological activities, with one causing birth defects.

Question 18

Which of the following statements about the genetic basis of living organisms is correct?

Accepted Answer

Genetic information must be stored, expressed, and reproduced with minimal errors for life to persist.

Question 19

Which of the following best describes the role of water in the chemical composition of living organisms?

Accepted Answer

Water accounts for much of the hydrogen and oxygen found in living things.

Module 1: Biochemistry and the Unity of Life – Foundations for Anatomy & Physiology

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