Question 1

Which of the following best defines an isomer in organic chemistry?

Accepted Answer

A molecule with the same molecular formula but a different arrangement of atoms in space.

Question 2

Which of the following is NOT one of the six major elements that combine to form organic compounds?

Accepted Answer

Calcium

Question 3

What is the valence number of nitrogen, and why is it significant for organic molecules?

Accepted Answer

3; it allows nitrogen to form three covalent bonds, enabling the formation of amino groups in proteins.

Question 4

Which of the following best describes a hydrocarbon?

Accepted Answer

A molecule consisting entirely of carbon and hydrogen atoms.

Question 5

Which functional group is responsible for the acidic properties of amino acids?

Accepted Answer

Carboxyl group $$\mathrm{(-COOH)}$$

Question 6

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

Accepted Answer

Carbon can form four covalent bonds, allowing for a diversity of stable, complex structures.

Question 7

Which of the following is a correct structural formula for an inorganic phosphate ion?

Accepted Answer

$$\mathrm{PO_4$^{3-}}$$

Question 8

A molecule contains a hydroxyl group $$\mathrm{(-OH)}$$ and a carbonyl group $$\mathrm{(C=O)}. $$Which property is most likely increased in this molecule?

Accepted Answer

Solubility in water due to increased polarity.

Question 9

Which of the following best describes the difference between ATP and ADP?

Accepted Answer

ATP has three phosphate groups, while ADP has two.

Question 10

Which functional group is most likely to be found in the side chain of an amino acid that forms disulfide bridges in proteins?

Accepted Answer

Sulfhydryl group $$\mathrm{(-SH)}$$

Question 11

Which of the following best explains the importance of functional groups in organic chemistry?

Accepted Answer

They determine the chemical reactivity and properties of organic molecules.

Question 12

A patient is diagnosed with a genetic disorder that affects the methylation of DNA. Which functional group is directly involved in this process?

Accepted Answer

Methyl group $$\mathrm{(-CH_3$)}$$

Question 13

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

Accepted Answer

ATP consists of an adenine base, a ribose sugar, and three phosphate groups.

Question 14

Which of the following best describes a structural isomer?

Accepted Answer

Molecules with the same molecular formula but different covalent arrangements of their atoms.

Question 15

Which functional group is most likely to make a molecule act as a base by accepting a proton?

Accepted Answer

Amino group $$\mathrm{(-NH_2$)}$$

Question 16

Which of the following best explains why ATP is considered the 'energy currency' of the cell?

Accepted Answer

The hydrolysis of ATP releases energy that can be used to drive cellular processes.

Question 17

Which of the following best describes the role of phosphate groups in nucleic acids like DNA and RNA?

Accepted Answer

They form part of the backbone, linking sugars together via phosphodiester bonds.

Question 18

A molecule with the formula $$\mathrm{C_6H_{12}O_6$} is $$most likely which type of organic compound?

Accepted Answer

Monosaccharide

Question 19

Which of the following functional groups is most likely to be found in steroid hormones and is responsible for their hydrophobic nature?

Accepted Answer

Methyl group $$\mathrm{(-CH_3$)}$$

Question 20

Which of the following best describes the difference between a ketone and an aldehyde functional group?

Accepted Answer

A ketone has a carbonyl group $$\mathrm{(C=O)}$$ within the carbon skeleton, while an aldehyde has it at the end.

Organic Chemistry and Biological Molecules: Key Concepts and Functional Groups

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