Question 1

Which property of carbon most directly contributes to the molecular diversity of life?

Accepted Answer

Its ability to form up to four covalent bonds with a variety of atoms

Question 2

Stanley Miller's classic experiment demonstrated which of the following concepts?

Accepted Answer

The abiotic synthesis of organic compounds under conditions thought to resemble those of early Earth

Question 3

Which functional group is responsible for making organic molecules act as acids by donating protons ($$H^+$$)?

Accepted Answer

Carboxyl group ($$-COOH)$$

Question 4

A molecule with the formula $$C_5H_{12}$$ can exist as both pentane and 2-methylbutane. What type of isomerism does this illustrate?

Accepted Answer

Structural isomerism

Question 5

Which of the following best explains why hydrocarbons are a major component of fats and serve as energy storage molecules?

Accepted Answer

Hydrocarbons can undergo reactions that release large amounts of energy

Question 6

Which functional group is found in all amino acids and acts as a base by accepting $$H^+$$ ions?

Accepted Answer

Amino group ($$-NH_2$)

Question 7

Enantiomers are important in the pharmaceutical industry because:

Accepted Answer

Only one enantiomer is usually biologically active, while the other may be inactive or harmful

Question 8

Which functional group is most likely to confer a negative charge to a molecule and is involved in energy transfer reactions such as those in ATP?

Accepted Answer

Phosphate group ($$-$$OPO_3$$^{2-})$$

Question 9

Which of the following statements about organic chemistry is correct?

Accepted Answer

Organic chemistry is the study of compounds that contain carbon, regardless of their origin

Question 10

A molecule with a hydroxyl group ($$-OH) is $$classified as:

Accepted Answer

An alcohol

Question 11

Which of the following is true about the carbon skeletons of organic molecules?

Accepted Answer

They can vary in length, branching, double bond position, and presence of rings

Question 12

Which functional group is most likely to form a cross-link that stabilizes protein structure?

Accepted Answer

Sulfhydryl group ($$-SH)$$

Question 13

Which of the following molecules contains a carbonyl group at the end of its carbon skeleton?

Accepted Answer

Propanal

Question 14

What is the main difference between cis-trans isomers?

Accepted Answer

They differ in the spatial arrangement of atoms around a double bond

Question 15

Which functional group is NOT hydrophilic and does NOT increase solubility in water?

Accepted Answer

Methyl group ($$-CH_3$)

Question 16

Which of the following best describes the role of ATP in cells?

Accepted Answer

ATP stores the potential to react with water, releasing energy for cellular processes

Question 17

Which functional group is involved in DNA methylation and regulation of gene expression?

Accepted Answer

Methyl group ($$-CH_3$)

Question 18

A molecule with both an amino group ($$-NH_2$) and a carboxyl group (-$$COOH$$) is most likely:

Accepted Answer

An amino acid

Question 19

Which of the following is a real-world example of the importance of enantiomers in medicine?

Accepted Answer

R-albuterol relaxes bronchial muscles, while S-albuterol is less effective

Question 20

Which of the following elements is NOT one of the major elements found in living organisms?

Accepted Answer

Calcium (Ca)

Carbon and the Molecular Diversity of Life: Study Notes

Study Guide - Practice Questions