Question 1

Which historical experiment provided the first evidence against the doctrine of vitalism by synthesizing an organic compound from inorganic precursors?

Accepted Answer

Friedrich Wöhler's synthesis of urea from ammonium cyanate

Question 2

Which of the following best describes the primary focus of biochemistry?

Accepted Answer

The chemistry of life at the molecular level, including structure and function of biomolecules

Question 3

Which type of bond links nucleotide monomers in nucleic acids?

Accepted Answer

Phosphodiester bond

Question 4

Amino acids are joined together in proteins by which type of chemical linkage?

Accepted Answer

Amide (peptide) bond

Question 5

Which of the following is NOT a major class of biological macromolecules essential for life?

Accepted Answer

Steroids

Question 6

Which of the following statements about lipids is TRUE?

Accepted Answer

Lipids form noncovalent assemblies due to the hydrophobic effect

Question 7

Which of the following best explains why polysaccharides can have significant structural diversity?

Accepted Answer

Their glycosidic bond linkages can vary in both chemical identity and geometry

Question 8

Which function is a major role of proteins, but not of nucleic acids or polysaccharides, according to the functions of biopolymers?

Accepted Answer

Carry out metabolic reactions

Question 9

Which of the following is a correct sequence of biological organization from smallest to largest?

Accepted Answer

Molecule → Organelle → Cell → Organ → Organism

Question 10

Which of the following best describes the hydrophobic effect in the context of biological membranes?

Accepted Answer

It drives the noncovalent association of lipid molecules in water

Question 11

Which of the following is a real-world application of biochemistry that has had a significant impact on medicine?

Accepted Answer

The discovery of antibiotics such as vancomycin and streptomycin

Question 12

Which of the following is the correct chemical equation for the synthesis of urea from ammonium cyanate, as performed by Friedrich Wöhler?

Accepted Answer

$$\mathrm{NH_4$^+NCO^- \xrightarrow{heat} H_2NCONH_2}$$

Question 13

Which of the following best describes the relationship between monomers and polymers in biological systems?

Accepted Answer

Monomers are joined together by covalent bonds to form polymers

Question 14

Which of the following is a function shared by both nucleic acids and proteins, but not by polysaccharides?

Accepted Answer

Encode information

Question 15

Which of the following is a correct example of a monomer-polymer pair?

Accepted Answer

Amino acid – Protein

Question 16

Which of the following best explains why the discovery of the double-helical structure of DNA was significant for biochemistry?

Accepted Answer

It provided a molecular explanation for the storage and transmission of genetic information

Question 17

Which of the following is a correct statement about the composition of cells?

Accepted Answer

Cells are primarily composed of water and a limited set of elements

Question 18

Which of the following bonds is responsible for linking glucose monomers in cellulose?

Accepted Answer

Glycosidic bond

Question 19

Which of the following best describes the role of nucleic acids in cells?

Accepted Answer

They encode and transmit genetic information

Introduction to Biochemistry: History, Principles, and Biomolecules

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