Bio 110 Final: Chapter 2

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Biology Quiz on Bio 110 Final: Chapter 2, created by Christina Marshall on 12/12/2017.
Christina Marshall
Quiz by Christina Marshall, updated more than 1 year ago
Christina Marshall
Created by Christina Marshall almost 7 years ago
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Resource summary

Question 1

Question
___________________________________ make(s) up the nucleus of an atom.
Answer
  • Protons and electrons
  • Protons and neutrons
  • DNA and RNA
  • Neutrons and electrons
  • DNA only

Question 2

Question
Living organisms are composed mainly of which atoms?
Answer
  • calcium, hydrogen, nitrogen, and oxygen
  • carbon, hydrogen, nitrogen, and oxygen
  • hydrogen, nitrogen, oxygen, and helium
  • carbon, helium, nitrogen, and oxygen
  • carbon, calcium, hydrogen, and oxygen

Question 3

Question
The ability of an atom to attract electrons in a bond with another atom is termed its
Answer
  • hydrophobicity
  • electronegativity
  • solubility
  • valence
  • both a and b

Question 4

Question
Hydrogen bonds differ from covalent bonds in that
Answer
  • covalent bonds can form between any type of atom, and hydrogen bonds form only between H and O.
  • covalent bonds involve sharing of electrons, and hydrogen bonds involve the complete transfer of electrons
  • covalent bonds result from equal sharing of electrons, but hydrogen bonds involve unequal sharing of electrons.
  • covalent bonds involve sharing of electrons between atoms, but hydrogen bonds are the result of weak attractions between a hydrogen atom of a polar molecule and an electronegative atom of another polar molecule.
  • covalent bonds are weak bonds that break easily, but hydrogen ions are strong links between atoms that are not easily broken.

Question 5

Question
A free radical
Answer
  • is a positively charged ion.
  • is an atom with one unpaired electron in its outer shell.
  • is a stable atom that is not bonded to another atom
  • can cause considerable cellular damage
  • both b and d.

Question 6

Question
Chemical reactions in living organisms
Answer
  • require energy to begin
  • usually require a catalyst to speed up the process
  • are usually reversible
  • occur in liquid environments, such as water.
  • all of the above

Question 7

Question
Solutes that easily dissolve in water are said to be
Answer
  • hydrophobic
  • hydrophilic
  • polar molecules
  • all of the above
  • b and c only

Question 8

Question
The molecular mass of glucose is about 180 g/mol. If 45g of glucose is dissolved into a final volume of 0.5L of water, what is the molarity of the solution?
Answer
  • 0.125M
  • 0.25M
  • 0.5M
  • 1.0M
  • 2.0M

Question 9

Question
The sum of the atomic masses of all the atoms of a molecule is its
Answer
  • atomic weight
  • molarity
  • molecular mass
  • concentration
  • polarity

Question 10

Question
Reactions in which water is used to break apart other molecules are known as ___________________ reactions.
Answer
  • hydrophilic
  • hydrophobic
  • dehydration
  • anabolic
  • hydrolysis
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