Q: A solution has a pH of 2. What is the concentration of hydrogen ions ($$[H^+]) in $$this solution?

$$[H^+] = 1 \times 10$$^{-2}$$ \text{ M}$$

Question 1

Which property of water allows it to moderate Earth's climate by absorbing heat without a significant rise in temperature?

Accepted Answer

High specific heat capacity

Question 2

A biologist is studying the effect of pH on enzyme activity. If the enzyme works best at pH 7, what happens when the pH is lowered to 3?

Accepted Answer

The enzyme will denature and lose its function

Question 3

Which of the following best explains why ice floats on water?

Accepted Answer

Hydrogen bonds in ice create a lattice that is less dense than liquid water

Question 4

Which functional group is found in both amino acids and proteins, and is responsible for their acidic properties?

Accepted Answer

Carboxyl group ($$-COOH)$$

Question 5

A patient is diagnosed with a genetic disorder that affects the structure of their cell membranes. Which type of biological molecule is most likely involved?

Accepted Answer

Lipids

Question 6

Which process involves the breakdown of polymers into monomers by adding water?

Accepted Answer

Hydrolysis

Question 7

Which of the following is a correct description of a phospholipid's structure?

Accepted Answer

A hydrophilic head and two hydrophobic tails

Question 8

Which equation correctly represents the dissociation of water into ions?

Accepted Answer

$$H_2O \rightarrow H^+ + OH^-$$

Question 9

A solution has a pH of 2. What is the concentration of hydrogen ions ($$[H^+]) in $$this solution?

Accepted Answer

$$[H^+] = 1 	imes 10$$^{-2}$$ 	ext{ M}$$

Question 10

Which of the following best describes the role of enzymes in biological reactions?

Accepted Answer

Enzymes decrease the activation energy required for reactions

Question 11

Which type of bond is responsible for the secondary structure of proteins?

Accepted Answer

Hydrogen bonds

Question 12

Which of the following is a polysaccharide used for energy storage in animals?

Accepted Answer

Glycogen

Question 13

A scientist adds a strong acid to a solution. What happens to the pH and the concentration of $$H^+$$ ions?

Accepted Answer

pH decreases, $$[H^+]$$ increases

Question 14

Which of the following is NOT a function of proteins in living organisms?

Accepted Answer

Storing genetic information

Question 15

Which of the following best explains why saturated fatty acids are solid at room temperature?

Accepted Answer

They have straight chains that pack closely together

Question 16

Which molecule is the primary energy currency of the cell?

Accepted Answer

ATP

Question 17

Which of the following is a correct pairing of a nucleic acid base and its complementary base in DNA?

Accepted Answer

Adenine ($$A) $$pairs with thymine ($$T)$$

Question 18

Which of the following reactions is an example of a dehydration synthesis?

Accepted Answer

Forming a peptide bond between two amino acids

Question 19

A mutation changes the sequence of bases in a gene. Which molecule will be directly affected by this change?

Accepted Answer

A protein

Question 20

Which of the following best describes the difference between DNA and RNA?

Accepted Answer

DNA is double-stranded, RNA is single-stranded

Biochemistry Foundations for General Biology

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