Biology 1107 Unit 1
What makes ionic bonds different from covalent bonds? - ANS -
Ionic bond involves the transfer of electrons whereas covalent
bond involves the sharing of electrons.
Why are hydrogen bonds and van der Waals interactions
necessary for cells? - ANS -Hydrogen bonds and van der Waals
interactions form weak associations between molecules,
providing the necessary shape and structure for DNA to
function in the body.
How many neutrons do carbon-12 and carbon-13 have,
respectively? - ANS -Carbon-12 contains 66 neutrons while
carbon-13 contains 77 neutrons.
When the temperature of liquid water is reduced, water freezes
and becomes less dense. This is a property not seen in most
other liquids. Ice floats on liquid water because it is less dense.
What molecular property of water allows for this phenomenon?
, - ANS -When water cools, hydrogen bonds between hydrogen
atoms push water molecules further apart.
What are three examples of how the characteristics of water
are important in maintaining life? - ANS -First, the lower density
of water as a solid versus a liquid allows ice to float, forming an
insulating surface layer for aquatic life. Second, the high specific
heat capacity of water insulates aquatic life or bodily fluids from
temperature changes. Third, the high heat of vaporization of
water allows animals to cool themselves by sweating.
Why can some insects walk on water? - ANS -Insects can walk
on water because of its high surface tension.
The unique properties of water are important in biological
processes. For the following three properties of water, define
the property and give one example of how the property affects
living organisms:
1. cohesion
2. adhesion
What makes ionic bonds different from covalent bonds? - ANS -
Ionic bond involves the transfer of electrons whereas covalent
bond involves the sharing of electrons.
Why are hydrogen bonds and van der Waals interactions
necessary for cells? - ANS -Hydrogen bonds and van der Waals
interactions form weak associations between molecules,
providing the necessary shape and structure for DNA to
function in the body.
How many neutrons do carbon-12 and carbon-13 have,
respectively? - ANS -Carbon-12 contains 66 neutrons while
carbon-13 contains 77 neutrons.
When the temperature of liquid water is reduced, water freezes
and becomes less dense. This is a property not seen in most
other liquids. Ice floats on liquid water because it is less dense.
What molecular property of water allows for this phenomenon?
, - ANS -When water cools, hydrogen bonds between hydrogen
atoms push water molecules further apart.
What are three examples of how the characteristics of water
are important in maintaining life? - ANS -First, the lower density
of water as a solid versus a liquid allows ice to float, forming an
insulating surface layer for aquatic life. Second, the high specific
heat capacity of water insulates aquatic life or bodily fluids from
temperature changes. Third, the high heat of vaporization of
water allows animals to cool themselves by sweating.
Why can some insects walk on water? - ANS -Insects can walk
on water because of its high surface tension.
The unique properties of water are important in biological
processes. For the following three properties of water, define
the property and give one example of how the property affects
living organisms:
1. cohesion
2. adhesion
