Question 1

The study of the chemical reactions of living things is called _____.​
A) ​anatomy
B) ​biochemistry
C) ​physiology
D) ​physics

Accepted Answer

Biochemistry is the study of the chemical reactions that occur within living organisms, including the study of biomolecules such as proteins, nucleic acids, carbohydrates, and lipids, as well as metabolism and enzyme function. Anatomy is the study of the physical structure of living organisms, physiology is the study of how living organisms function, and physics is the study of matter and energy.

Question 2

Sitting is a chair is an example of _____ energy​
A) ​potential
B) ​kinetic
C) ​ongoing

Accepted Answer

Sitting in a chair involves potential energy because an object in a chair has the potential to fall or move, but is currently at rest. Kinetic energy is the energy of motion, and sitting in a chair does not involve any significant motion. "Ongoing" is not a type of energy.

Question 3

Fructose found in fruit and honey is an example of a disaccharide.​

Accepted Answer

Fructose is a monosaccharide, not a disaccharide. Disaccharides are formed when two monosaccharides combine, such as sucrose (glucose + fructose) or lactose (glucose + galactose).

Question 4

Atoms that are alike combine to form the next stage of matter,which is a(n)_____.​
A) ​compound
B) ​molecule
C) ​element

Accepted Answer

Atoms that are alike combine to form an element, which is a pure substance consisting of only one type of atom.

Question 5

Electrolytes are responsible for the acidity or alkalinity of solutions and can conduct an electrical charge.​

Accepted Answer

Electrolytes are substances that dissociate into ions when dissolved in a solution. These ions can conduct an electrical charge, and the concentration of electrolytes in a solution can affect its pH (acidity or alkalinity) by contributing to the concentration of hydrogen ions (H+) or hydroxide ions (OH-) present in the solution.

Question 6

Medical imaging refers to invasive techniques and processes.​

Accepted Answer

Medical imaging refers to non-invasive techniques and processes, such as X-rays, MRI, CT scans, and ultrasound.

Question 7

Another name for a base is alkali.​

Accepted Answer

This is true. A base and an alkali are basically the same thing, with an alkali typically referring to a water-soluble base.

Question 8

Buffers help a living organism to maintain a constant pH value.​

Accepted Answer

Buffers can resist changes in pH by either accepting or donating protons, helping to maintain a constant pH value in an organism's system.

Question 9

Water makes up what percentage of our body weight?​
A) ​35% to 40%
B) ​55% to 65%
C) ​75% to 80%
D) ​Greater than 90%

Accepted Answer

Water makes up about 55% to 65% of our body weight, varying slightly depending on factors such as age, sex, and body composition. This is why it is important to maintain adequate hydration for proper bodily functions.

Question 10

The nucleus of every human cell contains how many chromosomes?​
A) ​23
B) ​46
C) ​69
D) ​92

Accepted Answer

The nucleus of every human cell contains 46 chromosomes. These 46 chromosomes are arranged in 23 pairs, consisting of one chromosome from each parent.

Question 11

Enzymes are specialized protein molecules found in all living cells.​

Accepted Answer

Enzymes are indeed specialized protein molecules found in all living cells. They act as catalysts for biological reactions and are essential for the proper functioning of many cellular processes.

Question 12

When an acid and a base are combined,they form a salt and water.This type of reaction is called a(n)_____.​
A) ​negatively charged hydroxide ion
B) ​neutralization
C) ​ionization

Accepted Answer

The process described in the question is that of a neutralization reaction, where an acid and a base react to form a salt and water. Choice A refers to a specific type of ion, while choice C refers to a process by which an atom or molecule gains or loses electrons to form ions. Neither of these choices accurately describes the reaction in question. Therefore, the best choice is B – neutralization.

Question 13

Hydrogen is an example of an atom.​

Accepted Answer

Yes, hydrogen is an example of an atom, specifically a neutral atom with one proton and one electron.

Question 14

Nuclear medicine is a branch of medicine that uses radioactive isotopes to prevent,diagnose,and treat disease.​

Accepted Answer

Nuclear medicine uses small amounts of radioactive material to diagnose and treat many different types of diseases, including cancer, heart disease, and neurological disorders.

Question 15

RNA structures are unique for each person and so are usable as a means of identification.​

Accepted Answer

RNA structures are not unique to each individual; they are largely determined by the genes inherited from parents and are similar among individuals of the same species. DNA, not RNA, is typically used for identification purposes due to its unique sequence in each individual.

Question 16

Phospholipids are lipids that contain cholesterol.​

Accepted Answer

Phospholipids are lipids that contain phosphorus and are a major component of the cell membrane. Cholesterol is a sterol, a type of lipid, that is also found in the cell membrane but is not a component of phospholipids.

Question 17

A solution with a pH of 5 would tell you it is _____.​
A) ​acidic
B) ​alkaline
C) ​neutral

Accepted Answer

A pH of 5 indicates that the solution is acidic.

Question 18

Triglycerides are a type of _____.​
A) ​protein
B) ​fat
C) ​carbohydrate
D) ​glycogen

Accepted Answer

Triglycerides are a type of fat that is found in the blood and stored in adipose tissue.

Question 19

Which of the following is an example of a lipid?​
A) ​Carbohydrate
B) ​Protein
C) ​Fat
D) ​Enzyme

Accepted Answer

Lipids, commonly known as fats, include substances such as oils and cholesterol, and are characterized by their insolubility in water.

Question 20

The sour taste of lemons is due to the presence of a compound called a(n)_____.​
A) ​acid
B) ​base
C) ​salt
D) ​pH

Accepted Answer

The sour taste of lemons is due to the presence of citric acid, which is a type of organic acid. Therefore, the correct answer is A.

Quiz 2: Chemistry of Living Things

The study of the chemical reactions of living things is called _____.

Sitting is a chair is an example of _____ energy

Fructose found in fruit and honey is an example of a disaccharide.

Atoms that are alike combine to form the next stage of matter,which is a(n) _____.

Electrolytes are responsible for the acidity or alkalinity of solutions and can conduct an electrical charge.

Medical imaging refers to invasive techniques and processes.

Another name for a base is alkali.

Buffers help a living organism to maintain a constant pH value.

Water makes up what percentage of our body weight?

The nucleus of every human cell contains how many chromosomes?

Enzymes are specialized protein molecules found in all living cells.

When an acid and a base are combined,they form a salt and water.This type of reaction is called a(n) _____.

Hydrogen is an example of an atom.

Nuclear medicine is a branch of medicine that uses radioactive isotopes to prevent,diagnose,and treat disease.

RNA structures are unique for each person and so are usable as a means of identification.

Phospholipids are lipids that contain cholesterol.

A solution with a pH of 5 would tell you it is _____.

Triglycerides are a type of _____.

Which of the following is an example of a lipid?

The sour taste of lemons is due to the presence of a compound called a(n) _____.