Question 1

Which of the following best describes the process of hydrolysis in biological systems?

Accepted Answer

It is the breakdown of polymers into monomers by the addition of water, releasing energy.

Question 2

A solution has a hydrogen ion concentration of $$1 	imes 10$$^{-4}$$ M. What is its pH, and is it acidic, basic, or neutral?

Accepted Answer

pH 4; the solution is acidic.

Question 3

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes have the same atomic number but different atomic weights due to varying numbers of neutrons.

Question 4

A patient is given an intravenous solution that is hypertonic relative to their blood plasma. What is the most likely effect on their red blood cells?

Accepted Answer

The cells will lose water and shrink (crenate) due to osmosis.

Question 5

Which of the following best explains why water is considered a 'universal solvent'?

Accepted Answer

Water forms hydration spheres around ions and polar molecules, allowing them to dissolve.

Question 6

Which of the following chemical bonds is the strongest under physiological conditions?

Accepted Answer

Covalent bond

Question 7

A molecule of sodium chloride ($$\mathrm{NaCl}) is $$formed by which type of chemical bond, and what happens to it when dissolved in water?

Accepted Answer

Ionic bond; it dissociates into $$\mathrm{Na^+}$$ and $$\mathrm{Cl^-}$$ ions.

Question 8

Which of the following best describes the role of buffers in biological systems?

Accepted Answer

Buffers stabilize the pH of a solution by absorbing excess hydrogen or hydroxide ions.

Question 9

Which of the following is a correct example of complementary base pairing in DNA?

Accepted Answer

Adenine pairs with thymine, and guanine pairs with cytosine.

Question 10

A protein is exposed to high heat and strong acid. Which of the following is the most likely result?

Accepted Answer

The protein will denature, losing its specific shape and function.

Question 11

Which of the following best distinguishes saturated from unsaturated fatty acids?

Accepted Answer

Saturated fatty acids have only single bonds between carbon atoms, while unsaturated fatty acids have one or more double bonds.

Question 12

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

Accepted Answer

Storing genetic information for inheritance

Question 13

A solution is described as hypotonic relative to a cell. What will happen to the cell when placed in this solution?

Accepted Answer

The cell will gain water, swell, and may burst.

Question 14

Which of the following best describes the structure of a phospholipid and its role in cell membranes?

Accepted Answer

It has a hydrophilic head and two hydrophobic tails, forming a bilayer that acts as a barrier to water-soluble substances.

Question 15

Which of the following best explains the difference between anabolism and catabolism?

Accepted Answer

Anabolism builds large molecules from smaller ones, requiring energy; catabolism breaks down large molecules into smaller ones, releasing energy.

Question 16

Which of the following is a correct statement about redox (oxidation-reduction) reactions?

Accepted Answer

Oxidation and reduction always occur together, with oxidation being the loss of electrons and reduction being the gain of electrons.

Question 17

Which of the following best describes the role of ATP in cellular metabolism?

Accepted Answer

ATP acts as the main energy currency, transferring energy for cellular processes.

Question 18

A scientist is studying a molecule with the formula $$C_{6}H$$_{12}$$O_{6}$. Which class of biomolecule does this most likely represent, and what is its primary function?

Accepted Answer

It is a monosaccharide, primarily used for energy storage and as a building block for larger carbohydrates.

Question 19

Which of the following best explains why soap is effective at removing oily dirt from hands?

Accepted Answer

Soap molecules have hydrophilic heads and hydrophobic tails, allowing them to emulsify oils and suspend them in water.

Question 20

Which of the following is a correct example of chemical notation for a balanced reaction forming water from hydrogen and oxygen?

Accepted Answer

$$2H_2 + O_2$ \rightarrow 2H_2O$$

Chemical Principles of Microbiology: Foundations for Life and Microbial Function

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