Q: Which of the following equations correctly represents the hydrolysis of ATP?

$$\mathrm{ATP} + \mathrm{H}_2\mathrm{O} \rightarrow \mathrm{ADP} + P_i + \text{energy}$$

Question 1

Which of the following best describes the difference between potential and kinetic energy in the context of human physiology?

Accepted Answer

Potential energy is stored in chemical bonds, such as ATP, while kinetic energy is the energy of movement, such as muscle contraction.

Question 2

Which of the following mixtures is correctly matched with its example and description?

Accepted Answer

Suspension – blood; solute particles are very large, settle out, and may scatter light.

Question 3

Which property of water allows it to absorb and release large amounts of heat before changing temperature, and why is this important for the human body?

Accepted Answer

High heat capacity; it prevents sudden changes in body temperature.

Question 4

Which of the following statements about chemical bonds is correct?

Accepted Answer

Hydrogen bonds are weak attractions between a hydrogen atom and an electronegative atom.

Question 5

A solution has a pH of 5. Compared to a solution with a pH of 7, how much more acidic is it?

Accepted Answer

It is 100 times more acidic.

Question 6

Which of the following best describes the structure and function of phospholipids in the cell membrane?

Accepted Answer

They have a polar, hydrophilic head and two nonpolar, hydrophobic tails, forming a bilayer that regulates entry and exit of substances.

Question 7

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

Accepted Answer

Unsaturated fatty acids have one or more double bonds, causing kinks that prevent tight packing, making them liquid at room temperature.

Question 8

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

Accepted Answer

A sequence of amino acids linked by peptide bonds.

Question 9

What is the main function of enzymes in biological systems?

Accepted Answer

They act as biological catalysts, lowering the activation energy and increasing the speed of reactions.

Question 10

Which of the following correctly matches the nitrogenous base with the nucleic acid in which it is found?

Accepted Answer

Adenine is found in both DNA and RNA.

Question 11

Which of the following equations correctly represents the hydrolysis of ATP?

Accepted Answer

$$\mathrm{ATP} + \mathrm{H}_2\mathrm{O} ightarrow \mathrm{ADP} + P_i + 	ext{energy}$$

Question 12

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

Accepted Answer

It is a precursor for the synthesis of vitamin D, steroid hormones, and bile salts.

Question 13

A patient is experiencing muscle cramps due to an electrolyte imbalance. Which ion is most likely involved, and what is its primary function?

Accepted Answer

Potassium (K+); major ion in cells, necessary for nerve function and muscle contraction.

Question 14

Which of the following best explains why enzymes are specific to their substrates?

Accepted Answer

The active site of an enzyme has a unique shape that fits only specific substrates.

Question 15

Which of the following statements about DNA and RNA is correct?

Accepted Answer

DNA is double-stranded and contains deoxyribose, while RNA is single-stranded and contains ribose.

Question 16

Which of the following best describes an exergonic reaction in the human body?

Accepted Answer

A reaction that releases energy, such as the breakdown of glucose to produce ATP.

Question 17

Which of the following is true regarding the tertiary structure of a protein?

Accepted Answer

It is the 3D shape formed by interactions between secondary structures, including hydrogen and covalent bonds.

Question 18

Which of the following best explains why water is considered the 'universal solvent' in the human body?

Accepted Answer

Water's polarity allows it to dissolve and dissociate ionic substances, facilitating transport and chemical reactions.

Question 19

Which of the following best describes the process of dehydration synthesis?

Accepted Answer

The removal of water to form a bond between two monomers, such as amino acids or monosaccharides.

Chapter 2: Chemistry Comes Alive – Foundations for Anatomy & Physiology

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