Question 1

Which property of carbon most directly explains its ability to form large, complex, and varied molecules essential for life?

Accepted Answer

Its four valence electrons, allowing it to form four covalent bonds

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 cis-trans isomers?

Accepted Answer

Structural isomers have different covalent arrangements of atoms, while cis-trans isomers have the same covalent bonds but differ in spatial arrangement around a double bond

Question 4

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

Accepted Answer

Carboxyl group $$-COOH$$

Question 5

A pharmaceutical company discovers that only one enantiomer of a drug is biologically active. What does this imply about the drug’s structure?

Accepted Answer

The drug has a mirror-image form that interacts differently with biological molecules

Question 6

Which functional group is most likely to be found in sugars and is responsible for their classification as either aldoses or ketoses?

Accepted Answer

Carbonyl group $$-C=O$$

Question 7

Which of the following statements about ATP is correct?

Accepted Answer

ATP releases energy when it reacts with water, breaking a phosphate bond

Question 8

What is the result of the reaction: $$\mathrm{ATP} + \mathrm{H}_2\mathrm{O} ightarrow \mathrm{ADP} + 	ext{inorganic phosphate} + 	ext{energy}$$?

Accepted Answer

Energy is released for cellular work

Question 9

Which functional group is most likely to participate in cross-linking that stabilizes protein structure, such as in hair?

Accepted Answer

Sulfhydryl group $$-SH$$

Question 10

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 11

Which functional group is nonpolar and often affects gene expression when attached to DNA?

Accepted Answer

Methyl group $$-CH_3$

Question 12

Which of the following is true about hydrocarbons?

Accepted Answer

They are hydrophobic and can store large amounts of energy

Question 13

Which functional group is found in alcohols and is capable of forming hydrogen bonds with water?

Accepted Answer

Hydroxyl group $$-OH$$

Question 14

Testosterone and estradiol are both steroids with a common carbon skeleton. What accounts for their different biological activities?

Accepted Answer

The arrangement and type of functional groups attached to the skeleton

Question 15

Which element has a valence of 3 and is essential for the structure of amino acids?

Accepted Answer

Nitrogen

Question 16

Which of the following best explains why carbon chains can form rings, branches, and vary in length?

Accepted Answer

Carbon can form four covalent bonds with a variety of atoms

Question 17

Which functional group is most likely to act as a base and pick up a proton from the surrounding solution?

Accepted Answer

Amino group $$-NH_2$

Question 18

Which functional group is commonly found in organic phosphates and is important for energy transfer in cells?

Accepted Answer

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

Question 19

Which of the following is a correct statement about enantiomers?

Accepted Answer

They are mirror images of each other and may have different biological activities

Question 20

A fat molecule is largely composed of which type of organic molecule, and what property does this confer?

Accepted Answer

Hydrocarbons, making it hydrophobic and energy-rich

Chapter 4: The Chemistry of Carbon – The Backbone of Life

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