Question 1

Which property of carbon allows it to form large and complex molecules essential for life?

Accepted Answer

Its tetravalence, allowing four covalent bonds with other atoms

Question 2

Which of the following best describes a hydrocarbon?

Accepted Answer

A molecule containing only carbon and hydrogen

Question 3

What is the main difference between structural isomers and geometric isomers?

Accepted Answer

Structural isomers differ in the arrangement of atoms; geometric isomers differ in spatial arrangement around a double bond

Question 4

Which functional group is responsible for the acidic properties of acetic acid?

Accepted Answer

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

Question 5

A molecule with the formula $$\mathrm{C_2H_4} is $$best described as:

Accepted Answer

An unsaturated hydrocarbon with a double bond

Question 6

Which of the following statements about enantiomers is correct?

Accepted Answer

They are mirror images and cannot be superimposed

Question 7

Which functional group is found in all amino acids and acts as a base?

Accepted Answer

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

Question 8

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

Accepted Answer

ATP contains a high-energy bond between its phosphate groups that releases energy when hydrolyzed

Question 9

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

Accepted Answer

Propanal

Question 10

A molecule with the formula $$\mathrm{C_6H_{12}O_6$}$$ can exist as different isomers. Which type of isomerism is most likely to affect its biological activity?

Accepted Answer

Enantiomerism

Question 11

Which of the following best describes the role of functional groups in organic molecules?

Accepted Answer

They are the main sites of chemical reactivity

Question 12

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

Accepted Answer

It contains alternating single and double bonds in a ring

Question 13

Which group is responsible for the transfer of energy in ATP?

Accepted Answer

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

Question 14

Which of the following best explains why fats are a good source of energy?

Accepted Answer

They contain many hydrocarbon chains that can be oxidized to release energy

Question 15

Which of the following is a thiol group and what is its significance in proteins?

Accepted Answer

Sulfhydryl group ($$\mathrm{SH}$$); forms disulfide bridges

Question 16

Which of the following molecules is an example of a methylated compound?

Accepted Answer

5-Methyl cytosine

Question 17

A molecule with the formula $$\mathrm{CO(NH_2$)_2} is $$known as:

Accepted Answer

Urea

Question 18

Which of the following best describes the difference between testosterone and estradiol?

Accepted Answer

They differ only in the functional groups attached to the same carbon skeleton

Question 19

Which of the following is true about the reaction: $$\mathrm{ATP + H_2O \rightarrow ADP + P_i + energy}$$?

Accepted Answer

It releases energy that can be used for cellular work

Question 20

Which of the following best explains why enantiomers can have drastically different effects in biological systems?

Accepted Answer

Biological molecules are often chiral and interact differently with each enantiomer

Carbon and the Molecular Diversity of Life: Structure, Isomerism, and Functional Groups

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