Question 1

Which property of carbon most directly allows it to form the backbone of large, complex biological molecules?

Accepted Answer

Its four valence electrons, allowing up to four covalent bonds

Question 2

A hydrocarbon is defined as an organic molecule consisting of which elements?

Accepted Answer

Carbon and hydrogen

Question 3

Which of the following best explains why oxygen is the most abundant element by mass in the human body?

Accepted Answer

Oxygen is a major component of water, which makes up most of the human body

Question 4

Which functional group is characterized by a phosphorus atom bonded to four oxygen atoms, and is important in nucleic acids?

Accepted Answer

Phosphate group

Question 5

During the formation of a polymer from monomers, which type of reaction occurs and what is released?

Accepted Answer

Dehydration reaction; water is released

Question 6

If a polymer is made up of $$n$$ monomers, how many water molecules are required to completely hydrolyze it into monomers?

Accepted Answer

$$n-1$$

Question 7

Which of the following statements about carbon chains in organic molecules is correct?

Accepted Answer

Carbon chains can vary in length, branching, double bond position, and presence of rings

Question 8

Which element is most similar to carbon in terms of its position on the periodic table and its ability to form covalent bonds?

Accepted Answer

Silicon

Question 9

A dehydration reaction between two glucose molecules forms maltose and releases a water molecule. Which equation correctly represents this reaction?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$} + \mathrm{C_6H_{12}O_6$} \rightarrow \mathrm{C$$_{12}$$H_{22}O$$_{11}} + \mathrm{H_2O}$

Question 10

Which of the following is NOT a class of macromolecules found in living organisms?

Accepted Answer

Hydrocarbons

Question 11

Which process breaks down polymers into monomers by adding water?

Accepted Answer

Hydrolysis

Question 12

Why is phosphorus an important element in living organisms?

Accepted Answer

It is essential for building nucleic acids and ATP

Question 13

Which of the following best describes a polymer?

Accepted Answer

A chain-like macromolecule made of covalently bonded repeating units

Question 14

Which of the following is a correct statement about organic compounds?

Accepted Answer

They contain both carbon and hydrogen

Question 15

A scientist is studying a molecule with a long carbon chain, several branches, and a ring structure. Which property of carbon allows for this molecular diversity?

Accepted Answer

Carbon's ability to form single, double, and triple covalent bonds

Question 16

Which of the following is a correct equation for the hydrolysis of a polymer AB?

Accepted Answer

$$\mathrm{AB} + \mathrm{H_2O} \rightarrow \mathrm{A} + \mathrm{B}$$

Question 17

Which of the following is a common misconception about the elements that dominate life?

Accepted Answer

They are the most abundant elements in Earth's crust

Question 18

Which of the following best explains why silicon, despite being in the same group as carbon, is less suitable for forming the backbone of biological molecules?

Accepted Answer

Silicon forms weaker and less stable covalent bonds compared to carbon

Question 19

Which of the following is NOT a property of carbon that makes it essential for life?

Accepted Answer

Ability to form ionic bonds with hydrogen

Elements of Life: The Role of Carbon in Biological Molecules

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