BSC 1005: Exam 1 questions and
answers graded A+ updated
Water is formed when... - correct answer ✔✔oxygen covalently bonds two hydrogens
Covalent bonds share... - correct answer ✔✔electron pairs (electrons are not always equally
shared)
Uneven sharing of electron pairs leads to... - correct answer ✔✔polar covalent bonds where
there are partial positive and negative charges around parts of the molecule
Hydrogen bonding is... - correct answer ✔✔a type of intermolecular interaction where the
positively charged hydrogens of one water molecule are attracted to the negatively charged
oxygen of another molecule
Cohesion is... - correct answer ✔✔water molecules sticking to one another as a result of
hydrogen bonding
Adhesion is... - correct answer ✔✔water molecules sticking to other polar or charged objects
Capillary action is... - correct answer ✔✔the ability of water to rise against the force of gravity
in a narrow tube due to the combined effects of adhesion and cohesion (plants & blood vessels)
Why is water known as a "universal solvent"? - correct answer ✔✔because it is able to dissolve
most polar substances BUT water is a poor solvent of nonpolar substances
, Why is water resistant to changes in temperature? - correct answer ✔✔because it has a high
heat capacity because of the attractive forces of hydrogen bonding
What are the four classes of large biomolecules? - correct answer ✔✔Carbohydrates, lipids,
proteins, nucleic acid
What is a macromolecule? - correct answer ✔✔they are polymers built from monomers
What is a polymer? - correct answer ✔✔a long molecule consisting of building blocks called
monomers
What 3/4 of the classes of biomolecules are polymers? - correct answer ✔✔Carbohydrates,
protein, nucleic acid
When does a dehydration reaction occur? - correct answer ✔✔When two monomers bond
together through the loss of a water molecule
What is hydrolysis? - correct answer ✔✔a reaction that is essentially the reverse of the
dehydration reaction where polymers are disassembled by monomers
How are monosaccharides classified? - correct answer ✔✔The location of the carbonyl group
& the number of carbons in the carbon skeleton
How is a disaccharide formed? - correct answer ✔✔when a dehydration reaction joins two
monosaccharides
What is the bond to form a disaccharide called? - correct answer ✔✔This covalent bond is
called a glycolic linkage
answers graded A+ updated
Water is formed when... - correct answer ✔✔oxygen covalently bonds two hydrogens
Covalent bonds share... - correct answer ✔✔electron pairs (electrons are not always equally
shared)
Uneven sharing of electron pairs leads to... - correct answer ✔✔polar covalent bonds where
there are partial positive and negative charges around parts of the molecule
Hydrogen bonding is... - correct answer ✔✔a type of intermolecular interaction where the
positively charged hydrogens of one water molecule are attracted to the negatively charged
oxygen of another molecule
Cohesion is... - correct answer ✔✔water molecules sticking to one another as a result of
hydrogen bonding
Adhesion is... - correct answer ✔✔water molecules sticking to other polar or charged objects
Capillary action is... - correct answer ✔✔the ability of water to rise against the force of gravity
in a narrow tube due to the combined effects of adhesion and cohesion (plants & blood vessels)
Why is water known as a "universal solvent"? - correct answer ✔✔because it is able to dissolve
most polar substances BUT water is a poor solvent of nonpolar substances
, Why is water resistant to changes in temperature? - correct answer ✔✔because it has a high
heat capacity because of the attractive forces of hydrogen bonding
What are the four classes of large biomolecules? - correct answer ✔✔Carbohydrates, lipids,
proteins, nucleic acid
What is a macromolecule? - correct answer ✔✔they are polymers built from monomers
What is a polymer? - correct answer ✔✔a long molecule consisting of building blocks called
monomers
What 3/4 of the classes of biomolecules are polymers? - correct answer ✔✔Carbohydrates,
protein, nucleic acid
When does a dehydration reaction occur? - correct answer ✔✔When two monomers bond
together through the loss of a water molecule
What is hydrolysis? - correct answer ✔✔a reaction that is essentially the reverse of the
dehydration reaction where polymers are disassembled by monomers
How are monosaccharides classified? - correct answer ✔✔The location of the carbonyl group
& the number of carbons in the carbon skeleton
How is a disaccharide formed? - correct answer ✔✔when a dehydration reaction joins two
monosaccharides
What is the bond to form a disaccharide called? - correct answer ✔✔This covalent bond is
called a glycolic linkage
