Question 1

Which element makes up the largest percentage of the human body by mass?

Accepted Answer

Carbon

Question 2

Which of the following best describes an atom?

Accepted Answer

A form of matter that cannot be broken down by ordinary chemical reactions and maintains the properties of an element.

Question 3

Which subatomic particle determines the atomic number of an element?

Accepted Answer

Proton

Question 4

What is the maximum number of electrons that can occupy the 2p orbitals of an atom?

Accepted Answer

$$6$$

Question 5

Which of the following statements about covalent bonds is correct?

Accepted Answer

Covalent bonds involve the sharing of valence electrons between atoms.

Question 6

A molecule of water ($$H_2O) is $$held together by which type of bond between the hydrogen and oxygen atoms?

Accepted Answer

Covalent bond

Question 7

Which property of water allows it to absorb a large amount of heat with only a slight change in temperature?

Accepted Answer

High specific heat

Question 8

What is the pH of pure water at $$25^\circ C$$?

Accepted Answer

$$7$$

Question 9

Which of the following best explains why carbon is considered the 'universal adaptor' in biochemistry?

Accepted Answer

It can form four covalent bonds, allowing for a variety of stable structures.

Question 10

Which of the following is a correct statement about isomers?

Accepted Answer

Isomers have identical chemical formulas but different structures.

Question 11

A patient is experiencing acidosis (low blood pH). Which of the following chemical equations represents the buffer system that helps maintain blood pH?

Accepted Answer

$$HCO_3^- + H$$^+ \rightleftharpoons H_2CO_3$$

Question 12

Which of the following best describes the difference between a polar covalent bond and a nonpolar covalent bond?

Accepted Answer

Polar covalent bonds involve unequal sharing of electrons, while nonpolar covalent bonds involve equal sharing.

Question 13

Which of the following functional groups is essential for the formation of peptide bonds in proteins?

Accepted Answer

Amino and carboxyl groups

Question 14

Which of the following statements about hydrogen bonds is correct?

Accepted Answer

Hydrogen bonds are important for the structure of DNA and protein folding.

Question 15

Which of the following best explains why trans fats are problematic for human health?

Accepted Answer

Humans lack enzymes to efficiently metabolize trans fats, leading to their accumulation.

Question 16

Which of the following is a real-life example of the law of mass action in biological systems?

Accepted Answer

The maintenance of blood pH through the bicarbonate buffer system.

Question 17

Which of the following best describes the role of electronegativity in chemical bonding?

Accepted Answer

It determines how strongly an atom attracts electrons in a bond.

Question 18

A molecule with the formula $$C_6H_{12}O_6$ can exist as glucose or fructose. What type of relationship do these two molecules have?

Accepted Answer

They are isomers.

Question 19

Which of the following statements about water dissociation is correct?

Accepted Answer

Water dissociates to form $$H_3O^+$$ and $$OH^-$$ ions.

Question 20

Which of the following best explains why hemoglobin releases oxygen in tissues with low pH?

Accepted Answer

Low pH causes hemoglobin to convert to the deoxy state, releasing oxygen.

The Chemistry of Life: Chapter 2 Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards