Question 1

Which of the following best describes the process shown in the first image (Dehydration synthesis)?

Accepted Answer

A reaction where two monomers are joined together by removing a molecule of water.

Question 2

In the hydrolysis reaction depicted in the second image, what is the role of water?

Accepted Answer

Water acts as a reactant, breaking a bond in a polymer to form two monomers.

Question 3

Which statement about redox reactions, as illustrated in the third image, is correct?

Accepted Answer

The reducing agent loses electrons and is oxidized.

Question 4

Given the exchange reaction shown in the fourth image, which of the following best represents the general equation for an exchange reaction?

Accepted Answer

$$AB + CD \rightarrow AD + CB$$

Question 5

In the chemical equation $$C_6H_{12}O_6$ + 6O_2 \rightarrow 6CO_2 + 6H_2O$$, what does the coefficient '6' in front of $$O_2$$ indicate?

Accepted Answer

Six molecules of oxygen gas are required as reactants.

Question 6

According to the pH scale shown in the sixth image, which of the following solutions is most acidic?

Accepted Answer

Battery acid (pH 0)

Question 7

The seventh image shows a water droplet on a coin. Which property of water does this demonstrate?

Accepted Answer

Cohesion and surface tension

Question 8

Which part of the phospholipid bilayer, as shown in the eighth image, is hydrophobic?

Accepted Answer

The fatty acid tails

Question 9

In the DNA structure shown in the ninth image, which type of bond holds the nitrogenous bases together?

Accepted Answer

Hydrogen bonds

Question 10

The foods shown in the tenth image are rich in which type of macromolecule?

Accepted Answer

Carbohydrates

Question 11

Which of the following best describes the difference between hydrophobic and hydrophilic amino acids as shown in the eleventh image?

Accepted Answer

Hydrophobic amino acids are water-repelling, while hydrophilic amino acids are water-loving.

Question 12

Which level of protein structure is characterized by alpha helices and beta sheets, as shown in the twelfth image?

Accepted Answer

Secondary structure

Question 13

The thirteenth image shows a phospholipid. Which part interacts with water molecules?

Accepted Answer

Hydrophilic head

Question 14

Which molecule is represented in the fourteenth image, and what is its primary biological function?

Accepted Answer

Triglyceride; energy storage

Question 15

The fifteenth image shows several molecules with a four-ring structure. What class of biomolecules do these belong to?

Accepted Answer

Steroids

Question 16

Which of the following best describes the function of the codon chart shown in the sixteenth image?

Accepted Answer

It determines the sequence of amino acids in a protein.

Question 17

In the seventeenth image, which component forms the backbone of nucleic acids?

Accepted Answer

Sugar-phosphate groups

Question 18

Which base pairing is correct for DNA, as shown in the eighteenth image?

Accepted Answer

Guanine pairs with cytosine

Question 19

Which of the following is a key structural difference between DNA and RNA, as shown in the nineteenth image?

Accepted Answer

DNA is usually double-stranded, RNA is usually single-stranded.

Question 20

The twentieth image shows ATP. What happens when ATP is hydrolyzed?

Accepted Answer

Energy is released for cellular metabolism.

Chemistry of Life: Foundations for Microbiology

Study Guide - Practice Questions