Question 1

Which of the following statements best describes why living organisms are considered to be in a dynamic steady state rather than at equilibrium with their surroundings?

Accepted Answer

Living organisms constantly exchange matter and energy with their environment, maintaining internal conditions different from their surroundings.

Question 2

Which of the following is NOT a universal feature of living cells?

Accepted Answer

Cells are always surrounded by a rigid cell wall.

Question 3

Which of the following functional groups is present in both amino acids and nucleotides?

Accepted Answer

Hydroxyl group ($$\mathrm{OH})$$

Question 4

A patient is diagnosed with a deficiency in trace elements. Which of the following elements is most likely to be deficient?

Accepted Answer

Iron ($$\mathrm{Fe})$$

Question 5

Which of the following best explains why carbon is central to the chemistry of life?

Accepted Answer

Carbon can form four covalent bonds, allowing for a diversity of stable organic molecules.

Question 6

Which of the following macromolecules is primarily responsible for storing genetic information?

Accepted Answer

Nucleic acids

Question 7

A scientist discovers a new organism with no membrane-bound organelles and a single circular DNA molecule. To which domain does this organism most likely belong?

Accepted Answer

Bacteria

Question 8

Which of the following best describes the function of the plasma membrane in cells?

Accepted Answer

It acts as a selective barrier, regulating the movement of substances into and out of the cell.

Question 9

Which of the following is a correct pairing of a biomolecule with its monomeric unit?

Accepted Answer

Protein – Amino acid

Question 10

Which of the following best explains why evolution is considered a central principle in biochemistry?

Accepted Answer

Evolution explains the gradual changes in living organisms over time, leading to the diversity and similarity observed in biomolecules and cellular processes.

Question 11

Which of the following statements about prokaryotic and eukaryotic cells is correct?

Accepted Answer

Eukaryotic cells contain membrane-bound organelles, while prokaryotic cells do not.

Question 12

Which of the following is an example of a supramolecular complex found in eukaryotic cells?

Accepted Answer

Chromatin

Question 13

A mutation in the gene encoding a TATA-box-binding protein would most likely affect which cellular process?

Accepted Answer

Transcription initiation

Question 14

Which of the following best describes the relationship between the three domains of life?

Accepted Answer

Bacteria, Archaea, and Eukarya all share a common ancestor.

Question 15

Which of the following functional groups is found in both lipids and proteins?

Accepted Answer

Ester group ($$\mathrm{RCOOR'})$$

Question 16

Which of the following best describes an autotroph?

Accepted Answer

An organism that uses carbon dioxide as its carbon source.

Question 17

Which of the following is a correct statement about the role of ribosomes in cells?

Accepted Answer

Ribosomes are responsible for protein synthesis in both prokaryotic and eukaryotic cells.

Question 18

A cell is observed to have a plasma membrane, cytoplasm, and ribosomes, but lacks a nucleus. Which type of cell is this most likely to be?

Accepted Answer

Prokaryotic cell

Question 19

Which of the following best explains why water is essential for life at the molecular level?

Accepted Answer

Water acts as a solvent, facilitating biochemical reactions and transport of molecules.

Question 20

Which of the following is a correct description of the relationship between monomeric units and macromolecules?

Accepted Answer

Monomeric units such as amino acids and nucleotides polymerize to form proteins and nucleic acids, respectively.

Introduction to Biochemistry and the Unity of Life

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