Question 1

Which of the following statements best explains why neon (Ne) is chemically unreactive, as shown in the electron shell diagram?

Accepted Answer

Neon has a full outer electron shell, making it stable and unlikely to form chemical bonds.

Question 2

A patient presents with a large swelling in the neck, as shown in the image. Which trace element deficiency is most likely responsible for this condition?

Accepted Answer

Iodine

Question 3

Which of the following best describes the formation of sodium chloride (NaCl) as illustrated in the ionic bond diagram?

Accepted Answer

A sodium atom loses an electron to become a cation, and a chlorine atom gains an electron to become an anion; the resulting opposite charges attract.

Question 4

Which of the following molecules contains a double covalent bond, as shown in the electron-shell model diagram?

Accepted Answer

Oxygen ($$O_2)$$

Question 5

The polarity of a water molecule, as shown in the diagram, is primarily due to:

Accepted Answer

The unequal sharing of electrons between oxygen and hydrogen atoms, resulting in partial charges.

Question 6

Hydrogen bonds, as depicted in the water molecule diagram, are important in biology because they:

Accepted Answer

Help maintain the structure of proteins and DNA by stabilizing their shapes.

Question 7

According to the pH scale diagram, which of the following solutions has the highest concentration of hydrogen ions ($$[H^+]$$)?

Accepted Answer

Stomach hydrochloric acid (pH 1)

Question 8

Which process is responsible for the formation of a triglyceride from glycerol and fatty acids, as shown in the diagram?

Accepted Answer

Dehydration synthesis, which removes water molecules to form ester bonds.

Question 9

Which structural feature distinguishes a phospholipid from a triglyceride, as shown in the diagrams?

Accepted Answer

A phospholipid has a phosphate group and two fatty acids, while a triglyceride has three fatty acids.

Question 10

The molecule shown with four fused rings is an example of which type of lipid?

Accepted Answer

Steroid

Question 11

Which step in the enzyme-substrate interaction diagram represents the induced fit model?

Accepted Answer

Step 3: Substrate binding alters the shape of the enzyme, promoting product formation.

Question 12

Which type of chemical bond links amino acids together in a protein, as shown in the peptide bond formation diagram?

Accepted Answer

Peptide bond (a type of covalent bond)

Question 13

In the DNA double helix diagram, which base pairs with cytosine (C)?

Accepted Answer

Guanine (G)

Question 14

Which of the following is NOT a component of a nucleotide, as shown in the nucleotide structure diagram?

Accepted Answer

Fatty acid

Question 15

A solution with a pH of 2 has how many times the hydrogen ion concentration of a solution with a pH of 6?

Accepted Answer

$$10^4$$ times greater

Question 16

Which element is most abundant in the human body by weight, according to the table of principal elements?

Accepted Answer

Oxygen

Question 17

Which of the following best describes the role of buffers in the human body?

Accepted Answer

Buffers minimize changes in pH by accepting or donating hydrogen ions as needed.

Question 18

Which of the following is a polymer made of glucose monomers and serves as the main storage form of glucose in animals?

Accepted Answer

Glycogen

Question 19

Which property of water allows it to help regulate body temperature in humans?

Accepted Answer

High heat capacity due to hydrogen bonding

Question 20

Which of the following best explains why cellulose cannot be digested by humans?

Accepted Answer

Humans lack the enzymes necessary to break the specific glycosidic bonds in cellulose.

The Chemical Level of Organization: Foundations for Anatomy & Physiology

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