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 class of biological macromolecules is NOT formed by polymerization of identical or similar monomeric units?

Accepted Answer

Lipids

Question 3

A patient presents with a blood pH of 7.1. Based on the physiological pH range, how would you classify this condition?

Accepted Answer

Acidosis

Question 4

Which of the following best describes an amphipathic molecule?

Accepted Answer

A molecule with both hydrophilic and hydrophobic regions

Question 5

What type of bond links the monomers in a protein?

Accepted Answer

Peptide (amide) bond

Question 6

Which property of water is MOST responsible for its ability to dissolve ionic compounds?

Accepted Answer

Permanent dipole

Question 7

Given the equation $$pH = -\log [H^+]$$, what is the pH of a solution with $$[H^+] = 1 	imes 10$$^{-5}$$ M?

Accepted Answer

$$pH = 5$$

Question 8

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

Accepted Answer

Fe$$^{2+}$$

Question 9

Which macromolecule is primarily responsible for storing genetic information?

Accepted Answer

Nucleic acids

Question 10

A strong acid in water will:

Accepted Answer

Completely dissociate, forming a hydronium ion

Question 11

Which of the following is a correct statement about the phospholipid bilayer?

Accepted Answer

It is the primary component of cellular membranes

Question 12

Which linkage connects monosaccharide units in polysaccharides?

Accepted Answer

Glycosidic (ether) bond

Question 13

Which property of water allows it to act as a temperature buffer in living organisms?

Accepted Answer

High heat capacity

Question 14

If a protein is placed in a solution with pH far from its isoelectric point, what is the likely effect?

Accepted Answer

The protein will gain a net positive or negative charge

Question 15

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

Accepted Answer

Forming cellular membranes

Question 16

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

Accepted Answer

Ice has a lower density than liquid water due to its molecular lattice

Question 17

Which of the following is a correct application of the Brønsted-Lowry definition?

Accepted Answer

An acid donates a proton

Question 18

A solution has a pH of 8.0. What is the hydrogen ion concentration $$[H^+]$$?

Accepted Answer

$$1 	imes 10$$^{-8}$$ M

Question 19

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

Accepted Answer

Astronomy

Question 20

Which of the following statements about the physiological pH range is correct?

Accepted Answer

Most biological reactions occur between pH 6.5 and 8.0

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

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