BIOL 2070 - LECTURE 2 EXAM QUESTIONS AND ANSWERS
WITH COMPLETE SOLUTIONS
True or False: outermost electrons determine how atoms interact
True
How do covalent bonds form?
sharing of electrons
True or False: More than one electron pair can be involved in covalent bonding
True
Correct this statement: Covalent bonds share electrons equally.
Covalent bonds often share electrons unequally.
True or False: Covalent bonds are unable to survive conditions inside cells
False. They are strong enough to do so
How are ionic bonds formed?
Gain and loss of electrons
Are hydrogen bonds covalent or noncovalent?
noncovalent
True or False: Cells are made of a large amount of atom types.
False. Relatively few
What are the 4 most common elements in living things?
C, H, O, N
What are the two main types of chemical bonds?
, ionic and covalent
True or False: Ionic bonds are weak
False. They are strong
Rank the following bonds from shortest to longest: van der Waals, ionic,
covalent, hydrogen
Covalent --> Ionic --> Hydrogen --> Van der Waals
What bonds are stronger, covalent or noncovalent?
Covalent
True or False: Polar molecules can form acids and bases in water.
True
As the concentration of hydroxyl ions increase, what happens to the
concentration of hydronium ions?
Decreases
True or False: A cell is formed from nitrogen compounds
False. Carbon
what are the four major families of small organic molecules in cells?
Sugars, fatty acids, amino acids, and nucelotides
FITB: Sugars are subunits of ________
polysaccharides
FITB: Fatty acid chains are components of cell ________
membranes
FITB: amino acids are subunits of ______
proteins
WITH COMPLETE SOLUTIONS
True or False: outermost electrons determine how atoms interact
True
How do covalent bonds form?
sharing of electrons
True or False: More than one electron pair can be involved in covalent bonding
True
Correct this statement: Covalent bonds share electrons equally.
Covalent bonds often share electrons unequally.
True or False: Covalent bonds are unable to survive conditions inside cells
False. They are strong enough to do so
How are ionic bonds formed?
Gain and loss of electrons
Are hydrogen bonds covalent or noncovalent?
noncovalent
True or False: Cells are made of a large amount of atom types.
False. Relatively few
What are the 4 most common elements in living things?
C, H, O, N
What are the two main types of chemical bonds?
, ionic and covalent
True or False: Ionic bonds are weak
False. They are strong
Rank the following bonds from shortest to longest: van der Waals, ionic,
covalent, hydrogen
Covalent --> Ionic --> Hydrogen --> Van der Waals
What bonds are stronger, covalent or noncovalent?
Covalent
True or False: Polar molecules can form acids and bases in water.
True
As the concentration of hydroxyl ions increase, what happens to the
concentration of hydronium ions?
Decreases
True or False: A cell is formed from nitrogen compounds
False. Carbon
what are the four major families of small organic molecules in cells?
Sugars, fatty acids, amino acids, and nucelotides
FITB: Sugars are subunits of ________
polysaccharides
FITB: Fatty acid chains are components of cell ________
membranes
FITB: amino acids are subunits of ______
proteins
