Question 1

Which of the following best describes the difference between a physical and a chemical change in matter?

Accepted Answer

A chemical change alters the basic nature of a substance, while a physical change does not.

Question 2

Which of the following elements is the most abundant in the human body by mass?

Accepted Answer

Oxygen

Question 3

A patient is found to have a deficiency in the element required for proper thyroid hormone production. Which element is most likely deficient?

Accepted Answer

Iodine

Question 4

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes of an element have the same atomic number but different atomic masses.

Question 5

Which type of chemical bond is responsible for the surface tension of water?

Accepted Answer

Hydrogen bond

Question 6

A solution has a pH of 5. What does this indicate about the solution?

Accepted Answer

It is acidic and contains more H$$^+$$ ions than OH$$^-$$ ions.

Question 7

Which of the following best explains why sodium (Na) and chlorine (Cl) form an ionic bond?

Accepted Answer

Sodium donates an electron to chlorine, resulting in oppositely charged ions that attract.

Question 8

Which of the following is a correct representation of a synthesis reaction?

Accepted Answer

$$A + B \rightarrow AB$$

Question 9

Which property of water helps prevent sudden changes in body temperature?

Accepted Answer

High heat capacity

Question 10

A patient is experiencing muscle cramps due to an electrolyte imbalance. Which ion is most likely involved in muscle contraction?

Accepted Answer

Potassium (K$$^+)$$

Question 11

Which of the following best describes the difference between saturated and unsaturated fats?

Accepted Answer

Saturated fats contain only single covalent bonds and are solid at room temperature.

Question 12

Which of the following is a function of proteins in the human body?

Accepted Answer

Acting as enzymes to catalyze biochemical reactions

Question 13

Which of the following statements about ATP is correct?

Accepted Answer

ATP releases energy when a high-energy phosphate bond is broken.

Question 14

Which of the following best describes a buffer in biological systems?

Accepted Answer

A buffer maintains a stable pH by accepting or donating H$$^+$$ ions.

Question 15

Which of the following is a correct example of a neutralization reaction?

Accepted Answer

$$\mathrm{NaOH} + \mathrm{HCl} \rightarrow \mathrm{H_2O} + \mathrm{NaCl}$$

Question 16

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

Accepted Answer

Water's polarity allows it to dissolve many ionic and polar substances.

Question 17

Which of the following is a property of enzymes?

Accepted Answer

They lower the activation energy required for a reaction.

Question 18

Which of the following best describes the primary structure of a protein?

Accepted Answer

A sequence of amino acids in a polypeptide chain

Question 19

Which of the following is a correct statement about nucleic acids?

Accepted Answer

RNA contains the sugar ribose and the base uracil.

Lecture PP-Chapter 2: Basic Chemistry – Essentials of Human Anatomy & Physiology Study Notes

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