Question 1

Which of the following best defines an organic molecule?

Accepted Answer

A molecule primarily composed of carbon atoms bonded to hydrogen and other elements.

Question 2

Why is carbon considered a versatile building block for biological molecules?

Accepted Answer

Because it can form four covalent bonds, allowing for diverse molecular structures.

Question 3

Which of the following is NOT a way in which carbon skeletons can vary?

Accepted Answer

Formation of ionic bonds between carbon atoms.

Question 4

Which statement correctly describes structural isomers?

Accepted Answer

They have the same molecular formula but different covalent arrangements of atoms.

Question 5

Estradiol and testosterone are both steroid hormones. Which feature do they share structurally?

Accepted Answer

They both have the same carbon skeleton of four fused rings.

Question 6

Which functional group is characterized by the formula $$\mathrm{R{-}OH}$$ and is commonly found in alcohols?

Accepted Answer

Hydroxyl group

Question 7

A molecule with the formula $$\mathrm{C_6H_{12}O_6$}$$ can exist as different isomers. Which property allows these isomers to have different biological functions?

Accepted Answer

The arrangement of atoms within the molecule.

Question 8

Which of the following best describes a cis-trans (geometric) isomer?

Accepted Answer

Isomers that differ in spatial arrangement around a double bond.

Question 9

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

Accepted Answer

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

Question 10

A student is given a molecule with the following structure: $$\mathrm{CH_3${-}CH_2${-}CH_2${-}OH}. $$Which functional group is present?

Accepted Answer

Hydroxyl group

Question 11

Which of the following statements about enantiomers is correct?

Accepted Answer

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

Question 12

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

Accepted Answer

Phosphate group

Question 13

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

Accepted Answer

Its ability to form up to four covalent bonds with other atoms.

Question 14

Which of the following is a correct example of a carbon skeleton variation?

Accepted Answer

A straight chain versus a branched chain of carbon atoms.

Question 15

Which functional group is found in both estradiol and testosterone and is crucial for their classification as steroids?

Accepted Answer

Four fused carbon rings (steroid nucleus)

Question 16

A molecule contains both a carboxyl group and an amino group. What type of molecule is this most likely to be?

Accepted Answer

An amino acid

Question 17

Which of the following is a real-world example of the importance of isomers in biology?

Accepted Answer

Glucose and fructose have the same molecular formula but different structures, affecting their metabolism.

Question 18

Which functional group is most likely to make a molecule more soluble in water?

Accepted Answer

Hydroxyl group ($$\mathrm{OH})$$

Question 19

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

Accepted Answer

Because biological molecules are often chiral and interact differently with each enantiomer.

Question 20

A student is asked to identify the functional group in the following molecule: $$\mathrm{CH_3${-}COOH}. $$What is the correct answer?

Accepted Answer

Carboxyl group

Study Notes: Carbon Compounds and Functional Groups

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