Human Biology Exam 1 questions with
correct answers.
Fundamental forms of matter are composed of ______ that cannot be broken down by normal physical
means. ANS - atoms
Water is cohesive because ANS - Two water molecules are attracted to each other with Hydrogen
bonds
How does the H+ ion concentration in a solution with a pH of 2 compare to that in a solution with a pH
of 4? ANS - There are one hundred times as many H+ ions in the solution with a pH of 2
An organic compound always contains one or more atoms of ____________. ANS - Carbon
Carbon is commonly found in the molecules of living organisms because ANS - It forms up to four
covalent bonds
Imagine a newly discovered biological molecule that is mostly hydrophobic in its structure. This new
molecule will most likely be classified as a ANS - lipid.
Each of the following is a lipid except ANS - cellulose.
What is the name of a molecule composed of one or more sugars ANS - carbohydrate
What type of chemical bond connects the complementary strands of a DNA molecule to each other?
ANS - hydrogen bonds
What are the monomer ""building blocks"" that make up proteins? ANS - amino acids
The proteins that catalyze chemical reactions in the body are called ANS - enzymes.
, How does ATP provide energy to a cell? ANS - It loses a phosphate group, releasing energy in the
process.
(Choose all that apply) Atoms are "happy" and thus most stable when ANS - The outer electron shell is
full, the number of protons and electrons are equal.
Which of the following is nonpolar? ANS - a molecule with no partial charges, electrons are shared
equally
The normal pH of human blood is ANS - between 7.35 and 7.45
Imagine some table sugar dissolved in water. Which term best describes the water? ANS - solvent
The storage form of carbohydrates in animals, including humans, is found mainly in the liver and the
muscles. This carbohydrate is called ___. ANS - Glycogen
Animal fats are usually solid at room temperature because their fatty acids are ___. ANS - Saturated
The important atom found in proteins but not found in carbohydrates or lipids is ___. ANS - Nitrogen
List the 4 types of biomolecules and provide a brief function of each. ANS - Carbohydrates are used for
energy and can be used as structural support.
Protein function varies depending on the structure but can be involved in structural support,
transmitting information in and out of cells, and muscle contraction.
Lipids provide essential fatty acids and can be the structural component of cell membranes (if they are
phospholipids.)
Nucleic Acids are involved in storing genetic information through DNA, RNA, and can be used as an
energy source through ATP.
correct answers.
Fundamental forms of matter are composed of ______ that cannot be broken down by normal physical
means. ANS - atoms
Water is cohesive because ANS - Two water molecules are attracted to each other with Hydrogen
bonds
How does the H+ ion concentration in a solution with a pH of 2 compare to that in a solution with a pH
of 4? ANS - There are one hundred times as many H+ ions in the solution with a pH of 2
An organic compound always contains one or more atoms of ____________. ANS - Carbon
Carbon is commonly found in the molecules of living organisms because ANS - It forms up to four
covalent bonds
Imagine a newly discovered biological molecule that is mostly hydrophobic in its structure. This new
molecule will most likely be classified as a ANS - lipid.
Each of the following is a lipid except ANS - cellulose.
What is the name of a molecule composed of one or more sugars ANS - carbohydrate
What type of chemical bond connects the complementary strands of a DNA molecule to each other?
ANS - hydrogen bonds
What are the monomer ""building blocks"" that make up proteins? ANS - amino acids
The proteins that catalyze chemical reactions in the body are called ANS - enzymes.
, How does ATP provide energy to a cell? ANS - It loses a phosphate group, releasing energy in the
process.
(Choose all that apply) Atoms are "happy" and thus most stable when ANS - The outer electron shell is
full, the number of protons and electrons are equal.
Which of the following is nonpolar? ANS - a molecule with no partial charges, electrons are shared
equally
The normal pH of human blood is ANS - between 7.35 and 7.45
Imagine some table sugar dissolved in water. Which term best describes the water? ANS - solvent
The storage form of carbohydrates in animals, including humans, is found mainly in the liver and the
muscles. This carbohydrate is called ___. ANS - Glycogen
Animal fats are usually solid at room temperature because their fatty acids are ___. ANS - Saturated
The important atom found in proteins but not found in carbohydrates or lipids is ___. ANS - Nitrogen
List the 4 types of biomolecules and provide a brief function of each. ANS - Carbohydrates are used for
energy and can be used as structural support.
Protein function varies depending on the structure but can be involved in structural support,
transmitting information in and out of cells, and muscle contraction.
Lipids provide essential fatty acids and can be the structural component of cell membranes (if they are
phospholipids.)
Nucleic Acids are involved in storing genetic information through DNA, RNA, and can be used as an
energy source through ATP.
