Question 1

Carbohydrates are water soluble and a good source of energy for the human body.

Accepted Answer

A) True 
 B)False  True

Question 2

Describe how buffers work in the human body. Also explain their significance using a specific example.

Accepted Answer

Will vary. The pH of your blood must stay between 7.4 and 7.5 or your cells will cease to function. Carbonic acid in blood acts as a buffer by dissociating to release H⁺ ions (Hydrogen) and HCO₃ (Bicarbonate) ions. If the system is acidic with more of H⁺ concentration , the bicarbonate ion will absorb H⁺ ions to form carbonic acid and if the system is low on H⁺ ions, carbonic acid will dissociate to release H⁺ ions. This buffer maintains the consistent pH in the blood

Question 3

Which type of lipid is a key component of the cell membrane?

Accepted Answer

A)  Steroid 
B)  Phospholipid 
C)  Triglyceride 
D)  Fatty acid 
A)  Steroid 
B)  Phospholipid 
C)  Triglyceride 
D)  Fatty acid B

Question 4

Which description of Ca2+ is most accurate?

Accepted Answer

A)  A positive ion that has lost 2 electrons. 
B)  A positive ion that has gained 2 protons. 
C)  An isotope with 2 extra neutrons. 
D)  An atom that has gained 2 electrons. 
A)  A positive ion that has lost 2 electrons. 
B)  A positive ion that has gained 2 protons. 
C)  An isotope with 2 extra neutrons. 
D)  An atom that has gained 2 electrons.

Question 5

Which collection of elements are the most common in living organisms?

Accepted Answer

A)  Oxygen, carbon, hydrogen, and nitrogen 
B)  Oxygen, sulfur, nitrogen, and carbon 
C)  Carbon, hydrogen, neon, and nitrogen 
D)  Oxygen, hydrogen, neon, and sulfur 
A)  Oxygen, carbon, hydrogen, and nitrogen 
B)  Oxygen, sulfur, nitrogen, and carbon 
C)  Carbon, hydrogen, neon, and nitrogen 
D)  Oxygen, hydrogen, neon, and sulfur

Question 6

A subunit, like -COOH, when attached to an organic molecule will determine how it reacts with other chemicals. The subunit is known as a(n) ___________.

Accepted Answer

The answer of A subunit, like -COOH, when attached to...

Question 7

The negatively charged particle labeled C is called a(n) ________.

Accepted Answer

A)  electron 
B)  neutron 
C)  proton 
D)  oxygen 
A)  electron 
B)  neutron 
C)  proton 
D)  oxygen

Question 8

The valence shell of an atom determines how many bonds it can form.

Accepted Answer

A) True 
 B)False

Question 9

A positively charged ion is formed when an atom gains electrons.

Accepted Answer

A) True 
 B)False

Question 10

Which bond is the weakest?

Accepted Answer

A)  Peptide 
B)  Ionic 
C)  Covalent 
D)  Hydrogen 
A)  Peptide 
B)  Ionic 
C)  Covalent 
D)  Hydrogen

Question 11

During transcription

Accepted Answer

A)  a molecule of mRNA is made from the DNA template. 
B)  a new protein/polypeptide is made from RNA directions. 
C)  tRNA molecules pick up nucleotides in the nucleus. 
D)  a new molecule of DNA is made so there are two exact copies. 
A)  a molecule of mRNA is made from the DNA template. 
B)  a new protein/polypeptide is made from RNA directions. 
C)  tRNA molecules pick up nucleotides in the nucleus. 
D)  a new molecule of DNA is made so there are two exact copies.

Question 12

This molecule is single stranded and involved in regulation and transfer of information.

Accepted Answer

A)  Lipid 
B)  RNA 
C)  DNA 
D)  Carbohydrate 
A)  Lipid 
B)  RNA 
C)  DNA 
D)  Carbohydrate

Question 13

What is the difference between Carbon-12 and Carbon-14?

Accepted Answer

A)  Carbon-14 is older. 
B)  Carbon-14 has more neutrons. 
C)  Carbon-14 has more protons. 
D)  Carbon-14 has a half-life of 14 years. 
A)  Carbon-14 is older. 
B)  Carbon-14 has more neutrons. 
C)  Carbon-14 has more protons. 
D)  Carbon-14 has a half-life of 14 years.

Question 14

Translation coverts the information stored in ____ into ____.

Accepted Answer

A)  RNA, DNA 
B)  DNA, a polypeptide 
C)  RNA, a polypeptide 
D)  DNA, RNA 
A)  RNA, DNA 
B)  DNA, a polypeptide 
C)  RNA, a polypeptide 
D)  DNA, RNA

Question 15

Why is this organic molecule important in living organisms?

Accepted Answer

A)  Structural component for most parts of a cell 
B)  Stores genetic information 
C)  Insulation 
D)  Biological energy 
A)  Structural component for most parts of a cell 
B)  Stores genetic information 
C)  Insulation 
D)  Biological energy

Question 16

What would happen if the active site of an enzyme had a different shape?

Accepted Answer

A)  Nothing would change 
B)  The process would happen in reverse 
C)  The enzyme would die 
D)  The enzyme would not be functional 
A)  Nothing would change 
B)  The process would happen in reverse 
C)  The enzyme would die 
D)  The enzyme would not be functional

Question 17

What makes an acid different from a base?

Accepted Answer

A)  Acids contain more hydrogen ions than hydroxide ions. 
B)  Acids have a pH of 7 or greater. 
C)  Acids taste sweet. 
D)  Acids have equal amounts of hydrogen and hydroxide ions. 
A)  Acids contain more hydrogen ions than hydroxide ions. 
B)  Acids have a pH of 7 or greater. 
C)  Acids taste sweet. 
D)  Acids have equal amounts of hydrogen and hydroxide ions.

Question 18

What does the letter C represent in this diagram?

Accepted Answer

A)  Enzyme 
B)  Product 
C)  Substrate 
D)  Acid 
A)  Enzyme 
B)  Product 
C)  Substrate 
D)  Acid

Question 19

Exothermic reactions like burning hydrogen fuel release energy.

Accepted Answer

A) True 
 B)False

Question 20

Water is both ___________ and adhesive, allowing it to fill vessels and spaces within the body.

Accepted Answer

The answer of Water is both ___________ and adhesive, allowing...

Exam 3: Everyday Chemistry of Life

Carbohydrates are water soluble and a good source of energy for the human body.

Describe how buffers work in the human body. Also explain their significance using a specific example.

Which type of lipid is a key component of the cell membrane?

Which description of Ca2+ is most accurate?

Which collection of elements are the most common in living organisms?

A subunit, like -COOH, when attached to an organic molecule will determine how it reacts with other chemicals. The subunit is known as a(n) ___________.

The negatively charged particle labeled C is called a(n) ________.

The valence shell of an atom determines how many bonds it can form.

A positively charged ion is formed when an atom gains electrons.

Which bond is the weakest?

During transcription

This molecule is single stranded and involved in regulation and transfer of information.

What is the difference between Carbon-12 and Carbon-14?

Translation coverts the information stored in ____ into ____.

Why is this organic molecule important in living organisms?

What would happen if the active site of an enzyme had a different shape?

What makes an acid different from a base?

What does the letter C represent in this diagram?

Exothermic reactions like burning hydrogen fuel release energy.

Water is both ___________ and adhesive, allowing it to fill vessels and spaces within the body.

What Is Life

Where Do We Come From and Where Do We Fit

Cells: Organization and Communication

Tissues

The Skeletomuscular System

The Nervous System

The Special Senses

Immunity and the Lymphatic System

Infectious Disease and Epidemiology

The Human Microbiome

Cancer

The Cardiovascular System

The Respiratory System: Movement of Air

Nutrition: You Are What You Eat

The Digestive System

The Urinary System

The Endocrine System and Development

The Reproductive Systems: Maintaining the Species

Pregnancy: Development From Conception to Newborn

Inheritance, Genetics, and Molecular Biology

Filters

Which description of Ca²⁺ is most accurate?

Translation coverts the information stored in into .