Question 1

Which of the following best describes the Miller-Urey experiment and its significance in biology?

Accepted Answer

It simulated early Earth conditions and showed that organic molecules like amino acids could form spontaneously.

Question 2

Which of the following is NOT a characteristic shared by all living organisms?

Accepted Answer

Presence of a nucleus

Question 3

Which level of biological organization is immediately above 'cell' in complexity?

Accepted Answer

Tissue

Question 4

Which domain of life includes organisms that are prokaryotic and often found in extreme environments?

Accepted Answer

Archaea

Question 5

Which of the following statements about viruses is TRUE?

Accepted Answer

Viruses lack cellular structure and cannot carry out metabolism on their own.

Question 6

Which chemical property is determined by the number of valence electrons in an atom?

Accepted Answer

Chemical reactivity

Question 7

Which of the following bonds is primarily responsible for the cohesion of water molecules?

Accepted Answer

Hydrogen bonds

Question 8

If the hydrogen ion concentration $$[H^+] of a $$solution is $$1 	imes 10$$^{-5}$$ M, what is the pH of the solution?

Accepted Answer

$$pH = 5$$

Question 9

Which functional group is present in all amino acids and is responsible for their acidic properties?

Accepted Answer

Carboxyl group

Question 10

Which of the following best explains why water is an excellent solvent for ionic compounds?

Accepted Answer

Water molecules are polar, allowing them to surround and separate positive and negative ions.

Question 11

Which of the following is a correct match between a polymer and its monomer?

Accepted Answer

Nucleic acid – Nucleotide

Question 12

Which of the following best describes a dehydration (condensation) reaction?

Accepted Answer

A reaction that forms polymers from monomers by removing a water molecule.

Question 13

Which of the following is a correct description of the secondary structure of a protein?

Accepted Answer

The folding of the polypeptide chain into alpha helices and beta sheets stabilized by hydrogen bonds.

Question 14

Which of the following is a purine found in nucleic acids?

Accepted Answer

Adenine

Question 15

Which of the following functional groups is found in both DNA and RNA nucleotides?

Accepted Answer

Phosphate group

Question 16

Which of the following statements about carbohydrates is TRUE?

Accepted Answer

Polysaccharides are formed by glycosidic bonds between monosaccharides.

Question 17

Which of the following is a correct example of a lipid and its function?

Accepted Answer

Phospholipid – Membrane structure

Question 18

A solution has a pH of 3. How many times more acidic is it than a solution with a pH of 6?

Accepted Answer

1000 times

Question 19

Which of the following best describes the quaternary structure of a protein?

Accepted Answer

The interaction and arrangement of multiple polypeptide chains.

Question 20

Which of the following is a correct statement about the difference between DNA and RNA?

Accepted Answer

DNA contains deoxyribose, while RNA contains ribose.

General Biology: Chemistry of Life, Biomolecules, and Functional Groups

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