Biology 152 UTM exam review questions
and answers
What is electronegativity? - Correct Answers -It is an atoms attraction for the electrons
in a covalent bond
What is a nonpolar covalent bond? - Correct Answers -equal sharing of electrons
What is a polar covalent bond? - Correct Answers -unequal sharing of electrons
What is a hydrogen bond? - Correct Answers -the attraction between a hydrogen atom
with a partial positive charge and another atom with a partial negative charge
What are hot spots? - Correct Answers -Asymmetrical distribution on electrons in a
molecule results in hot spots of positive or negative charge (van der waals interaction)
What are chemical reactions? - Correct Answers -the making and breaking of chemical
bonds
What are homologous structures? - Correct Answers -homologous structures are similar
in origin but not function (whale flippers /human arms)
vestigial structures - Correct Answers -remnant of a structure that may have had an
important function in a species' ancestors, but has no clear function in the modern
species.
convergent evolution or analogous features - Correct Answers -Evolution toward similar
characteristics in unrelated species
Doe's convergent evolution say something about ancestry? - Correct Answers -No
What are epidemic species - Correct Answers -Species not found anywhere else in the
world
What is the charged regions in what molecule cased by? - Correct Answers -The
charged regions of a water molecule are fused by the polar covalent bonds that hold the
molecule together.
, How are hydrogen bonds formed? - Correct Answers -Regions of neighbouring water
molecules with opposite partial charges are attracted to each other, forming hydrogen
bonds
How much water molecule can bind to each other? - Correct Answers -4. Each water
molecule can hydrogen bond to several others; these associations are constantly
changing.
How many negative regions does oxygen have in water molecules? - Correct Answers -
Because of its electron arrangement, oxygen has two regions with partial negative
charge.
What are the 4 emergent properties of water? - Correct Answers -1. Cohesive behavior
2. Ability to moderate temperature
3. Expansion upon freezing
4. Versatility as a solvent
What is the difference between cohesion and adhesion - Correct Answers -Cohesion:
Water is attracted to water, and Adhesion: Water is attracted to other substances.
What is surface tension? - Correct Answers -A measure of how difficult it is to stretch or
break the surface of a liquid
What's moderation of temperature? - Correct Answers -Water absorbs heat from
warmer air and releases stored heat to cooler air. Water absorbs or releases a large
amount of heat with little change in its own temperature.
What is water specific heat? - Correct Answers -It is the amount of heat that must be
absorbed or lost for 1 g of a substance to change temperature by 1 degree. 1cal/g/0c.
Due to heat absorbed when hydrogen bonds break. Heat released when hydrogen
bonds form
Why does ice float? - Correct Answers -Because hydrogen bonds in ice are more
"ordered," making ice less dense
What is hydrophilic and hydrophobic? - Correct Answers -Hydrophilic is water loving
and hydrophobic is water hating
What is dynamic equilibrium - Correct Answers -Water molecules dissociate at the
same time they are being reformed
What is ocean acidification? - Correct Answers -refers to a reduction in the pH of the
ocean over an extended period of time, caused primarily by uptake of carbon dioxide
(CO2) from the atmosphere. H+ ions combine with carbonate ions to produce
bicarbonate
and answers
What is electronegativity? - Correct Answers -It is an atoms attraction for the electrons
in a covalent bond
What is a nonpolar covalent bond? - Correct Answers -equal sharing of electrons
What is a polar covalent bond? - Correct Answers -unequal sharing of electrons
What is a hydrogen bond? - Correct Answers -the attraction between a hydrogen atom
with a partial positive charge and another atom with a partial negative charge
What are hot spots? - Correct Answers -Asymmetrical distribution on electrons in a
molecule results in hot spots of positive or negative charge (van der waals interaction)
What are chemical reactions? - Correct Answers -the making and breaking of chemical
bonds
What are homologous structures? - Correct Answers -homologous structures are similar
in origin but not function (whale flippers /human arms)
vestigial structures - Correct Answers -remnant of a structure that may have had an
important function in a species' ancestors, but has no clear function in the modern
species.
convergent evolution or analogous features - Correct Answers -Evolution toward similar
characteristics in unrelated species
Doe's convergent evolution say something about ancestry? - Correct Answers -No
What are epidemic species - Correct Answers -Species not found anywhere else in the
world
What is the charged regions in what molecule cased by? - Correct Answers -The
charged regions of a water molecule are fused by the polar covalent bonds that hold the
molecule together.
, How are hydrogen bonds formed? - Correct Answers -Regions of neighbouring water
molecules with opposite partial charges are attracted to each other, forming hydrogen
bonds
How much water molecule can bind to each other? - Correct Answers -4. Each water
molecule can hydrogen bond to several others; these associations are constantly
changing.
How many negative regions does oxygen have in water molecules? - Correct Answers -
Because of its electron arrangement, oxygen has two regions with partial negative
charge.
What are the 4 emergent properties of water? - Correct Answers -1. Cohesive behavior
2. Ability to moderate temperature
3. Expansion upon freezing
4. Versatility as a solvent
What is the difference between cohesion and adhesion - Correct Answers -Cohesion:
Water is attracted to water, and Adhesion: Water is attracted to other substances.
What is surface tension? - Correct Answers -A measure of how difficult it is to stretch or
break the surface of a liquid
What's moderation of temperature? - Correct Answers -Water absorbs heat from
warmer air and releases stored heat to cooler air. Water absorbs or releases a large
amount of heat with little change in its own temperature.
What is water specific heat? - Correct Answers -It is the amount of heat that must be
absorbed or lost for 1 g of a substance to change temperature by 1 degree. 1cal/g/0c.
Due to heat absorbed when hydrogen bonds break. Heat released when hydrogen
bonds form
Why does ice float? - Correct Answers -Because hydrogen bonds in ice are more
"ordered," making ice less dense
What is hydrophilic and hydrophobic? - Correct Answers -Hydrophilic is water loving
and hydrophobic is water hating
What is dynamic equilibrium - Correct Answers -Water molecules dissociate at the
same time they are being reformed
What is ocean acidification? - Correct Answers -refers to a reduction in the pH of the
ocean over an extended period of time, caused primarily by uptake of carbon dioxide
(CO2) from the atmosphere. H+ ions combine with carbonate ions to produce
bicarbonate
