PSU BIOLOGY EXAM 1 Mastery Pack :
Verified Questions &Step-by-Step Solutions
Which of the following would NOT be a key characteristic of "life"
inability to change
Non-living things would NOT naturally contain
DNA
The smallest unit of life that can exist as a separate entity is the
Cell
The smallest ion is made up of
One proton
The smallest ion has what charge
+1
During metabolism, ATP is used as an energy source for which of the following processes
Reproduction,growth,development
The ability to acquire,store,transfer,or utilize energy is called
Metabolism
Which of the following is the first or primary source of energy in the human body
Carbohydrates
A mutation is a change in
single base pair in DNA
Homeostasis provides what kind of environment
Constant
Blood pH is near a value of 7 because of
Water
Fats and oils are
Non-polar
If a patient's blood pH was found to be 7.15 the patient would be said to have
Acidosis
Sugars dissolve in water,therefore,they are
Polar
Polar covalent bonds are produced when two or more atoms
Share electrons unequally
Of the following,which is the first explanation of a problem
Hypothesis
In order to arrive at a solution to a problem,a scientist usually devises one or more
Experiments
Water molecules are attracted to each other by
Hydrogen bonds
O2 is an example of a
Molecule
Which is the smallest portion of an element that retains the properties of that element
Atom
The nucleus of an atom
1|P age
,Contains electrons and neutrons; the heaviest part of an atom
The simplest atom
Has one proton+ one electron
If an atom loses an electron it
Becomes Oxidized
If an element has 4 protons, it would tend to
Lose two electrons
The essential element in an organic compound is
Carbon
A solution with a pH of 3 has a [H+] of
1.0 X 10 to the negative 3 power
A substance that helps maintain pH balance is known as a
Buffer
Which of the following is closer to the pH of D/W
pH 8
How many electrons are needed to make Phosphorous have a stable valence shell
Three
A solution with a pH of 9 is how many times more basic than a solution with a pH of 7
100
In a chemical equation, the chemicals to the left of the arrow are
Reactants
An atom that gains or loses electrons is called an
Ion
Both atoms exert the same pull on shared electrons
Nonpolar covalent bonds
Cation ions are formed by
Oxidation reactions
Sodium is bonded to chlorine in the formation of sodium chloride by what type of chemical
bond
Ionic
Water is composed of two atoms of hydrogen and one atom of oxygen held together
through what type of chemical bond
Polar covalent
What do atoms of 6C12, 14Si28, and 32Ge73 have in common
#protons=#electrons in each, their outer electron shell contains the same # of electrons
A salt will dissolve in water to form
Ions
Glucose dissolves in water because it
Is polar and forms many hydrogen bonds with the water molecules
Cellular pH is kept near a value of 7 because of
Buffers
Carbon usually forms how many bonds with other atoms
4
Carbon has an atomic number of 6 while oxygen has an atomic number of 8. Which
combination of carbon and oxygen atoms would produce a stable molecule
1 carbon,2 oxygen
2|P age
, Which of the following is NOT a macromolecule
Nucleotides
Water ionizes to form
An equal amount of H+ and OH-
Radioactive isotopes have
Excess neutrons
Substances that are polar and mix with by water
Hydrophilic
Any substance that releases hydroxyl ions in water is a
Base
Any substance that releases hydrogen ions in water is an
Acid
Which is the smallest level of organization listed
Subatomic particle
Unequal distribution or unequal sharing of electrons between atoms will result in
Partially charged molecules
Organic macromolecules
Carbohydrates,Lipids,Proteins,Nucleic Acids
Calcium
C
Chlorine
Cl
Molybdenum
Mo
Iron
Fe
Zinc
Zn
Sulfur
S
NaCl
Na+ +Cl-
HCl
H+ +Cl-
NaOH
Na+ +OH-
Ionic bonds involve a
Transfer of electrons between atoms
Covalent bonds involve a
Sharing of electrons between atoms
Redox Reactions
Transfer of electrons
Reduction
Gain electron
Oxidation
Lose electron
3|P age
Verified Questions &Step-by-Step Solutions
Which of the following would NOT be a key characteristic of "life"
inability to change
Non-living things would NOT naturally contain
DNA
The smallest unit of life that can exist as a separate entity is the
Cell
The smallest ion is made up of
One proton
The smallest ion has what charge
+1
During metabolism, ATP is used as an energy source for which of the following processes
Reproduction,growth,development
The ability to acquire,store,transfer,or utilize energy is called
Metabolism
Which of the following is the first or primary source of energy in the human body
Carbohydrates
A mutation is a change in
single base pair in DNA
Homeostasis provides what kind of environment
Constant
Blood pH is near a value of 7 because of
Water
Fats and oils are
Non-polar
If a patient's blood pH was found to be 7.15 the patient would be said to have
Acidosis
Sugars dissolve in water,therefore,they are
Polar
Polar covalent bonds are produced when two or more atoms
Share electrons unequally
Of the following,which is the first explanation of a problem
Hypothesis
In order to arrive at a solution to a problem,a scientist usually devises one or more
Experiments
Water molecules are attracted to each other by
Hydrogen bonds
O2 is an example of a
Molecule
Which is the smallest portion of an element that retains the properties of that element
Atom
The nucleus of an atom
1|P age
,Contains electrons and neutrons; the heaviest part of an atom
The simplest atom
Has one proton+ one electron
If an atom loses an electron it
Becomes Oxidized
If an element has 4 protons, it would tend to
Lose two electrons
The essential element in an organic compound is
Carbon
A solution with a pH of 3 has a [H+] of
1.0 X 10 to the negative 3 power
A substance that helps maintain pH balance is known as a
Buffer
Which of the following is closer to the pH of D/W
pH 8
How many electrons are needed to make Phosphorous have a stable valence shell
Three
A solution with a pH of 9 is how many times more basic than a solution with a pH of 7
100
In a chemical equation, the chemicals to the left of the arrow are
Reactants
An atom that gains or loses electrons is called an
Ion
Both atoms exert the same pull on shared electrons
Nonpolar covalent bonds
Cation ions are formed by
Oxidation reactions
Sodium is bonded to chlorine in the formation of sodium chloride by what type of chemical
bond
Ionic
Water is composed of two atoms of hydrogen and one atom of oxygen held together
through what type of chemical bond
Polar covalent
What do atoms of 6C12, 14Si28, and 32Ge73 have in common
#protons=#electrons in each, their outer electron shell contains the same # of electrons
A salt will dissolve in water to form
Ions
Glucose dissolves in water because it
Is polar and forms many hydrogen bonds with the water molecules
Cellular pH is kept near a value of 7 because of
Buffers
Carbon usually forms how many bonds with other atoms
4
Carbon has an atomic number of 6 while oxygen has an atomic number of 8. Which
combination of carbon and oxygen atoms would produce a stable molecule
1 carbon,2 oxygen
2|P age
, Which of the following is NOT a macromolecule
Nucleotides
Water ionizes to form
An equal amount of H+ and OH-
Radioactive isotopes have
Excess neutrons
Substances that are polar and mix with by water
Hydrophilic
Any substance that releases hydroxyl ions in water is a
Base
Any substance that releases hydrogen ions in water is an
Acid
Which is the smallest level of organization listed
Subatomic particle
Unequal distribution or unequal sharing of electrons between atoms will result in
Partially charged molecules
Organic macromolecules
Carbohydrates,Lipids,Proteins,Nucleic Acids
Calcium
C
Chlorine
Cl
Molybdenum
Mo
Iron
Fe
Zinc
Zn
Sulfur
S
NaCl
Na+ +Cl-
HCl
H+ +Cl-
NaOH
Na+ +OH-
Ionic bonds involve a
Transfer of electrons between atoms
Covalent bonds involve a
Sharing of electrons between atoms
Redox Reactions
Transfer of electrons
Reduction
Gain electron
Oxidation
Lose electron
3|P age
