Question 1

Which experiment provided the first experimental evidence that organic biomolecules could be synthesized abiotically under early Earth conditions?

Accepted Answer

The Miller-Urey experiment

Question 2

Which of the following statements best describes the 'RNA World' hypothesis for the origin of life?

Accepted Answer

RNA or a related molecule acted as both the first genetic material and the first catalyst.

Question 3

Which of the following is NOT a function of proteins in living organisms?

Accepted Answer

Storing genetic information

Question 4

Which of the following correctly describes the bond that links two amino acids in a protein?

Accepted Answer

Peptide bond

Question 5

Which of the following elements is NOT considered one of the six most common elements in living organisms?

Accepted Answer

Iron (Fe)

Question 6

Which of the following statements about the structure of DNA is correct?

Accepted Answer

DNA nucleotides are linked by 5'-3' phosphodiester bonds.

Question 7

Which of the following best explains why unsaturated fatty acids are typically liquid at room temperature?

Accepted Answer

Their double bonds create kinks, preventing tight packing.

Question 8

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

Accepted Answer

Eukaryotic cells contain a nucleus, while prokaryotic cells do not.

Question 9

Which of the following best describes the role of phospholipids in biological membranes?

Accepted Answer

They form a bilayer with hydrophobic tails facing inward and hydrophilic heads facing outward.

Question 10

Which of the following is a correct statement about the flow of genetic information in cells?

Accepted Answer

DNA is transcribed into RNA, which is then translated into protein.

Question 11

Which of the following best explains why carbon is the backbone of biological molecules?

Accepted Answer

Carbon can form up to four covalent bonds, allowing for complex structures.

Question 12

Which of the following is a function of carbohydrates in living organisms?

Accepted Answer

Providing energy storage and structural support

Question 13

Which of the following best describes the difference between starch and cellulose?

Accepted Answer

Starch has α-1,4 linkages, while cellulose has β-1,4 linkages between glucose monomers.

Question 14

Which of the following is a correct description of the peptide bond formation?

Accepted Answer

It forms between the carboxyl group of one amino acid and the amino group of another, releasing water.

Question 15

Which of the following is a function of cholesterol in animal cells?

Accepted Answer

It provides structural support to cell membranes.

Question 16

Which of the following statements about the Miller-Urey experiment is correct?

Accepted Answer

It demonstrated that amino acids and other biomolecules could form under simulated early Earth conditions.

Question 17

Which of the following is a correct statement about the evolution of eukaryotic cells?

Accepted Answer

Endosymbiosis with aerobic bacteria led to the formation of mitochondria.

Question 18

Which of the following best describes the role of metal ions such as Mg²⁺ and Zn²⁺ in living organisms?

Accepted Answer

They play important roles as enzyme cofactors and in metabolism.

Question 19

Which of the following is a correct statement about the structure of phospholipids?

Accepted Answer

They have a hydrophilic head and two hydrophobic tails.

Question 20

A mutation in a gene leads to a change in a single amino acid in a protein. Which level of protein structure is directly affected by this mutation?

Accepted Answer

Primary structure

Biochemistry Foundations: Genes, Proteins, and Biomolecules

Study Guide - Practice Questions