Q: A solution has a hydrogen ion concentration of $$[H^+] = 1 \times 10$$^{-7}$$ M. What is the pH of this solution?

$$pH = -\log_{10}(1 \times 10$$^{-7}$$) = 7$$

Question 1

Which of the following best describes the structure and function of phospholipids in biological membranes?

Accepted Answer

Phospholipids have two hydrophobic tails and a hydrophilic phosphate head, forming a bilayer that separates aqueous environments.

Question 2

A solution has a hydrogen ion concentration of $$[H^+] = 1 	imes 10$$^{-7}$$ M. What is the pH of this solution?

Accepted Answer

$$pH = -\log_{10}(1 	imes 10$$^{-7}$$) = 7$$

Question 3

Which of the following is a correct statement about the difference between saturated and unsaturated fatty acids?

Accepted Answer

Saturated fatty acids contain only single bonds in their hydrocarbon tails, making them straight, while unsaturated fatty acids contain one or more double bonds, causing bends in their tails.

Question 4

Which functional group is responsible for the acidic properties of amino acids and fatty acids?

Accepted Answer

Carboxyl group ($$-COOH)$$

Question 5

A laboratory technician needs to prepare 500 mL of a 5% dextrose (glucose) solution. How many grams of glucose are required?

Accepted Answer

25 grams

Question 6

Which of the following best explains why proteins denature when exposed to high temperatures or extreme pH?

Accepted Answer

High temperatures and extreme pH disrupt hydrogen bonds and other interactions that maintain the protein’s three-dimensional structure.

Question 7

Which of the following is a polysaccharide found in the cell walls of plants and is not digestible by humans?

Accepted Answer

Cellulose

Question 8

Which of the following best describes the role of cholesterol in animal cells?

Accepted Answer

Cholesterol is a steroid that is a component of cell membranes and a precursor for bile salts, vitamin D, and steroid hormones.

Question 9

Which of the following statements about nucleotides is correct?

Accepted Answer

Nucleotides are composed of a ribose sugar, a nitrogenous base, and one or more phosphate groups.

Question 10

A patient’s blood test shows a sodium ion concentration of 140 mmol/L. How many equivalents per liter (Eq/L) does this represent, given sodium’s charge is +1?

Accepted Answer

0.140 Eq/L

Question 11

Which of the following best describes the induced-fit model of protein-ligand binding?

Accepted Answer

The protein changes shape slightly to fit the ligand upon binding, enhancing specificity.

Question 12

Which of the following is a correct example of a conjugated protein?

Accepted Answer

Lipoprotein, which is a protein combined with a lipid for transport in blood.

Question 13

Which of the following best explains why polar molecules are generally soluble in water?

Accepted Answer

Polar molecules can form hydrogen bonds with water, making them hydrophilic.

Question 14

Which of the following is a correct statement about the primary structure of a protein?

Accepted Answer

It is the sequence of amino acids in a polypeptide chain.

Question 15

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

Accepted Answer

Buffers moderate changes in pH by binding or releasing hydrogen ions.

Question 16

Which of the following is a real-life example of a prion disease caused by misfolded proteins?

Accepted Answer

Creutzfeldt–Jakob disease (vCJD) in humans

Question 17

Which of the following best describes the difference between glycogen and starch?

Accepted Answer

Glycogen is a highly branched glucose polymer found in animals, while starch is a glucose polymer found in plants.

Question 18

Which of the following is a correct statement about the quaternary structure of proteins?

Accepted Answer

It involves the association of two or more folded polypeptide chains.

Question 19

Which of the following best explains why hemoglobin is considered a quaternary protein?

Accepted Answer

Hemoglobin consists of multiple polypeptide subunits that function together.

Question 20

Which of the following best describes the role of functional groups in organic molecules?

Accepted Answer

Functional groups impact the chemical properties and behavior of organic molecules, such as acidity or polarity.

Molecular Interactions: Biomolecules and Bonds in Human Physiology

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