Q: A solution has a pH of 3. What is the concentration of hydrogen ions $$[H^+] in $$this solution?

$$[H^+] = 1 \times 10$$^{-3}$$ \ \mathrm{M}$$

Question 1

Which of the following best describes a dehydration synthesis reaction in biological systems?

Accepted Answer

It forms larger, more complex molecules from smaller ones, releasing water as a byproduct.

Question 2

A scientist is studying a reaction where a triglyceride is broken down into glycerol and fatty acids. Which type of reaction is this, and what is required for it to occur?

Accepted Answer

Decomposition reaction; requires addition of water (hydrolysis)

Question 3

Which property of water allows insects like the water strider to walk on its surface?

Accepted Answer

Cohesion due to hydrogen bonding

Question 4

A solution has a pH of 3. What is the concentration of hydrogen ions $$[H^+] in $$this solution?

Accepted Answer

$$[H^+] = 1 	imes 10$$^{-3}$$ \ \mathrm{M}$$

Question 5

Which of the following functional groups is found in all amino acids and is essential for peptide bond formation?

Accepted Answer

Carboxyl group ($$-COOH)$$

Question 6

Which of the following statements about phospholipids is correct?

Accepted Answer

They have hydrophilic heads and hydrophobic tails, forming the basis of cell membranes.

Question 7

A patient is suffering from acidosis (blood pH below 7.35). Which of the following would help buffer the blood and bring the pH closer to normal?

Accepted Answer

Adding a weak base

Question 8

Which of the following best explains why the neutralization of an acid by a base often produces water?

Accepted Answer

Because acids release $$H^+$$ ions and bases release $$OH^-$$ ions, which combine to form water.

Question 9

Which of the following is a correct description of a saturated fatty acid?

Accepted Answer

It contains only single bonds between carbon atoms in its hydrocarbon chain.

Question 10

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

Accepted Answer

Long-term energy storage

Question 11

A researcher isolates a molecule with the following structure: a phosphate group, a pentose sugar, and a nitrogenous base. This molecule is most likely a:

Accepted Answer

Nucleotide

Question 12

Which of the following statements about DNA and RNA is correct?

Accepted Answer

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

Question 13

Which of the following best describes the role of ATP in cells?

Accepted Answer

It is the main short-term energy supply for cellular processes.

Question 14

Which of the following is an example of an exchange reaction?

Accepted Answer

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

Question 15

Which of the following statements about salts is TRUE?

Accepted Answer

Salts dissociate in water to produce cations and anions other than $$H^+$$ and $$OH^-.$$

Question 16

Which of the following best explains why phospholipids form bilayers in aqueous environments?

Accepted Answer

Their hydrophilic heads interact with water, while hydrophobic tails avoid water.

Question 17

Which of the following is a function of carbohydrates in cells?

Accepted Answer

Forming the backbone of nucleic acids

Question 18

A mutation causes a change in the side group (R group) of an amino acid in a protein. Which level(s) of protein structure could this potentially affect?

Accepted Answer

Secondary, tertiary, and quaternary structures

Question 19

Which of the following best describes catabolism in living organisms?

Accepted Answer

It involves the breakdown of complex molecules into simpler ones, releasing energy.

Question 20

Which of the following bonds is responsible for the complementary base pairing in DNA?

Accepted Answer

Hydrogen bonds

Chapter 2: The Chemistry of Microbiology – Structured Study Notes Ch2-2

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