Question 1

Which of the following elements is NOT considered one of the four most abundant elements in living systems?

Accepted Answer

Phosphorus (P)

Question 2

Which type of linkage connects the monomers in nucleic acids?

Accepted Answer

Phosphodiester bond

Question 3

A patient is diagnosed with hypokalemia (low potassium levels). Which ion is directly involved and essential for life?

Accepted Answer

K$$^{+}$$

Question 4

Which property of water allows it to act as an excellent solvent for ionic compounds?

Accepted Answer

Relatively high dielectric constant

Question 5

Which of the following best describes an amphipathic molecule?

Accepted Answer

A molecule with both hydrophobic and hydrophilic regions

Question 6

Which class of biological macromolecules is NOT formed by polymerization of identical or similar monomers?

Accepted Answer

Lipids

Question 7

Given the equation $$\mathrm{pH} = -\log [\mathrm{H}^{+}]$$, what is the pH of a solution with $$[\mathrm{H}^{+}] = 1 	imes 10$$^{-6}$$ M?

Accepted Answer

$$\mathrm{pH} = 6$$

Question 8

Which of the following statements about acids and bases is TRUE according to the Brønsted-Lowry definition?

Accepted Answer

Acids are proton donors and bases are proton acceptors

Question 9

Which of the following is a correct pairing of biological macromolecule and its monomer?

Accepted Answer

Nucleic acid – Nucleotide

Question 10

A solution has a pH of 7.4. Which statement best describes its hydrogen ion concentration compared to a solution with pH 6.4?

Accepted Answer

It has 10 times lower $$[\mathrm{H}^{+}]$$

Question 11

Which of the following is a function of lipids in biological systems?

Accepted Answer

Forming cellular membranes

Question 12

Which property of water is responsible for its ability to moderate temperature changes in living organisms?

Accepted Answer

High heat capacity

Question 13

Which of the following best explains why the phospholipid bilayer forms spontaneously in water?

Accepted Answer

Phospholipids are amphipathic, with hydrophilic heads and hydrophobic tails

Question 14

Which of the following ions is NOT typically considered essential for life?

Accepted Answer

Fe$$^{2+}$$

Question 15

Which of the following statements about molecular charge and pH is correct?

Accepted Answer

Molecular charge depends on pH and affects biomolecular interactions

Question 16

Which of the following is the correct order of abundance for the major elements in living systems?

Accepted Answer

O \u003e C \u003e H \u003e N

Question 17

Which of the following is a correct description of a strong acid in aqueous solution?

Accepted Answer

It dissociates completely, releasing many protons

Question 18

Which of the following is NOT a direct field that contributes to biochemistry?

Accepted Answer

Physics

Question 19

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

Accepted Answer

Hydrogen bond

Question 20

A researcher adds a fatty acid to water and observes the formation of a micelle. What property of the fatty acid is responsible for this behavior?

Accepted Answer

It is amphipathic

Foundations of Biochemistry: Chemical Elements, Macromolecules, Water, and pH

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