Question 1

Which property of water allows it to dissolve ionic compounds such as NaCl, as shown in the image with salt crystals dissolving in water?

Accepted Answer

Water's polarity, which allows it to surround and separate ions

Question 2

Refer to the diagram of the water molecule. What type of bond holds the hydrogen and oxygen atoms together within a single water molecule?

Accepted Answer

Covalent bond

Question 3

Which of the following best explains why ice floats on liquid water, as shown in the image of water in three states?

Accepted Answer

Hydrogen bonds in ice create an open lattice structure, making it less dense than liquid water

Question 4

Based on the summary of chemical bonds, which bond type is primarily responsible for holding together the two strands of DNA?

Accepted Answer

Hydrogen bonds

Question 5

A solution has a pH of 4. What is the concentration of hydrogen ions $$[H^+] in $$this solution?

Accepted Answer

$$10^{-4}$$ moles/liter

Question 6

Which process is depicted in the image showing the removal of water to link monomers together, and what is its biological significance?

Accepted Answer

Dehydration synthesis; it builds macromolecules from smaller subunits

Question 7

In the image showing two monosaccharides joining to form a disaccharide, what is the name of the bond formed and the process involved?

Accepted Answer

Glycosidic bond; dehydration synthesis

Question 8

Which of the following statements about glycogen, as shown in the image of branched glucose chains, is correct?

Accepted Answer

Glycogen is a polysaccharide used for energy storage in animals

Question 9

The image of three triglyceride molecules shows differences in their fatty acid tails. Which statement best explains the physical state of saturated versus unsaturated fats at room temperature?

Accepted Answer

Saturated fats are solid at room temperature because their straight tails allow tight packing

Question 10

Which property of phospholipids, as shown in the cell membrane image, is essential for the formation of biological membranes?

Accepted Answer

Their amphipathic nature, with hydrophilic heads and hydrophobic tails

Question 11

Steroids, as shown in the image with four carbon rings, differ from other lipids in which way?

Accepted Answer

They have a structure based on four fused carbon rings

Question 12

Which level of protein structure is determined by the sequence of amino acids, as shown in the image of protein folding?

Accepted Answer

Primary structure

Question 13

Enzymes, as depicted in the image of substrate binding and product release, function by:

Accepted Answer

Decreasing the activation energy required for reactions

Question 14

Which of the following best describes the relationship between DNA, RNA, and proteins?

Accepted Answer

DNA contains instructions for making RNA, which then directs protein synthesis

Question 15

A nucleotide, as shown in the nucleic acid image, is composed of which three components?

Accepted Answer

A phosphate group, a five-carbon sugar, and a nitrogenous base

Question 16

Which of the following best explains why buffers are important in biological systems?

Accepted Answer

They minimize changes in pH, helping maintain stable conditions for enzymes and cellular processes

Question 17

ATP, as shown in the image, is often called the 'energy currency' of the cell. Which process releases energy from ATP for cellular work?

Accepted Answer

Hydrolysis of ATP to ADP and phosphate

Question 18

Which of the following is a correct real-life application of hydrolysis in the human body?

Accepted Answer

Breaking down dietary starch into glucose during digestion

Question 19

If a solution has a hydrogen ion concentration of $$[H^+] = 10$$^{-9}$$ moles/liter, what is its pH and is it acidic, neutral, or basic?

Accepted Answer

pH = 9; basic

Question 20

Which of the following best describes the difference between a peptide bond and a hydrogen bond?

Accepted Answer

A peptide bond is a strong covalent bond between amino acids, while a hydrogen bond is a weak attraction between polar molecules

Water and Biomolecules: Foundations of Life

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