Question 1

Which of the following elements is NOT included in the acronym CHNOPS, which represents the bulk elements found in living organisms?

Accepted Answer

Calcium

Question 2

Organic molecules are defined as chemical compounds that contain which of the following elements covalently bonded together?

Accepted Answer

Carbon and Hydrogen

Question 3

Which of the following best explains why carbon is considered an excellent building block for biological molecules?

Accepted Answer

It can form up to four covalent bonds, allowing for diverse molecular structures.

Question 4

A molecule contains only carbon and hydrogen atoms. According to the study materials, this molecule is classified as a:

Accepted Answer

Hydrocarbon

Question 5

Which of the following is NOT a way in which carbon backbones can vary in organic molecules?

Accepted Answer

Type of ionic charge

Question 6

Given the following structure, which functional group is present?

$\mathrm{R}-\mathrm{SH}$

Accepted Answer

Sulfhydryl

Question 7

Which of the following functional groups is commonly found in ATP and is important for energy transfer in cells?

Accepted Answer

Phosphate group

Question 8

A molecule with the formula $\mathrm{C}_2\mathrm{H}_6$ is best described as:

Accepted Answer

A hydrocarbon

Question 9

Which of the following functional groups is NOT present in the molecule shown below?

$\begin{array}{c}
\mathrm{O} \
|| \
\mathrm{C}-\mathrm{OH} \
| \
\mathrm{NH}_2
\end{array}$

Accepted Answer

Sulfhydryl

Question 10

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

Accepted Answer

They are groups of atoms that are reactive and commonly found together, often extending off the carbon backbone.

Question 11

A student is asked to identify the organic molecule among the following. Which one should they choose?

A. $\mathrm{CO}_2$ 
B. $\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6$ 
C. $\mathrm{H}_2\mathrm{O}$ 
D. $\mathrm{NaCl}$

Accepted Answer

$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6$

Question 12

Which of the following is an example of a molecule with a branched carbon backbone?

Accepted Answer

Butane ($\mathrm{C}_4\mathrm{H}_{10}$) in its isobutane form

Question 13

Which of the following best describes the difference between a hydrocarbon and an organic molecule?

Accepted Answer

Hydrocarbons contain only carbon and hydrogen, while organic molecules contain carbon covalently bonded to other elements.

Question 14

A molecule contains a carbon atom double-bonded to an oxygen atom and single-bonded to a hydroxyl group ($-\mathrm{OH}$). Which functional group does this describe?

Accepted Answer

Carboxyl group

Question 15

Which of the following is NOT a functional group commonly found in biological molecules?

Accepted Answer

Chloride

Question 16

A molecule with the structure $\mathrm{CH}_3-\mathrm{CH}_2-\mathrm{CH}_3$ is an example of which type of hydrocarbon?

Accepted Answer

Alkane

Question 17

Which of the following best explains why functional groups are important in biological molecules?

Accepted Answer

They determine the chemical reactivity and properties of molecules.

Question 18

A molecule contains a phosphate group. Which of the following is a likely function of this molecule in a biological system?

Accepted Answer

Energy transfer

Question 19

Which of the following best describes the relationship between the structure and function of organic molecules?

Accepted Answer

The structure, including the carbon backbone and attached functional groups, determines the molecule's function.

Question 20

A patient is found to have a genetic mutation that prevents the addition of methyl groups to DNA. Which of the following processes is most likely to be affected?

Accepted Answer

Gene expression regulation

Carbon and Functional Groups in Organic Molecules

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