$$ATP + H_2O \rightarrow ADP + P_i + \text{Energy}$$

Question 1

Which property of carbon most directly enables it to form large, complex, and diverse molecules essential for life?

Accepted Answer

Its four valence electrons allowing four covalent bonds

Question 2

Stanley Miller’s classic experiment demonstrated which concept about the origin of life?

Accepted Answer

Abiotic synthesis of organic compounds from inorganic chemicals is possible

Question 3

What is the molecular geometry around each carbon atom in methane ($$CH_4$$)?

Accepted Answer

Tetrahedral

Question 4

Which of the following best explains why carbon is the backbone of biological molecules?

Accepted Answer

Carbon can form four covalent bonds with a variety of atoms, allowing for molecular diversity

Question 5

When two carbon atoms are joined by a double bond, what is the spatial arrangement of the atoms attached to them?

Accepted Answer

They are in the same plane as the carbons

Question 6

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

Accepted Answer

Chloride group

Question 7

Which type of isomerism is responsible for the difference between glucose and fructose?

Accepted Answer

Structural isomerism

Question 8

Why are enantiomers important in the pharmaceutical industry?

Accepted Answer

Only one enantiomer is usually biologically active, and the other may be ineffective or harmful

Question 9

Which functional group is present in all amino acids and is responsible for their basic properties?

Accepted Answer

Amino group ($$-NH_2$)

Question 10

What is the major function of fats in animals, as related to their hydrocarbon structure?

Accepted Answer

Energy storage

Question 11

Which of the following molecules is an example of a hydrocarbon?

Accepted Answer

Methane ($$CH_4)$$

Question 12

Which statement best describes the role of ATP in cellular processes?

Accepted Answer

ATP stores potential energy that is released when it reacts with water

Question 13

Which equation correctly represents the hydrolysis of ATP?

Accepted Answer

$$ATP + H_2O ightarrow ADP + P_i + 	ext{Energy}$$

Question 14

Which of the following best explains the difference between cis-trans isomers?

Accepted Answer

They have the same covalent bonds but differ in spatial arrangement around a double bond

Question 15

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

Accepted Answer

Carboxyl group ($$-COOH)$$

Question 16

How does the presence of a methyl group ($$-CH_3$) affect the function of a molecule such as testosterone compared to estradiol?

Accepted Answer

It changes the molecule’s biological activity and function

Question 17

Which of the following statements about carbon skeletons is correct?

Accepted Answer

Carbon skeletons can vary in length, branching, and presence of rings

Question 18

Which chemical group is directly involved in energy transfer in cells, as seen in ATP?

Accepted Answer

Phosphate group ($$-PO_4$)

Question 19

Which of the following is true about the major elements of life (C, H, O, N, S, P)?

Accepted Answer

Their overall percentages are quite uniform from one organism to another

Question 20

Which statement best describes the relationship between functional groups and molecular function?

Accepted Answer

The number and arrangement of functional groups give each molecule its unique properties

Carbon and Molecular Diversity of Life: Study Notes (Chapter 4)

Study Guide - Practice Questions