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Multiple Choice Quiz
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1

Electrons circle the nucleus of an atom in what are called
A)spheres
B)domains
C)domiciles
D)orbitals
E)regions
2

The maximum number of electrons that the lowest energy level may contain (closest to the nucleus of the atom) is
A)2
B)4
C)6
D)8
E)9
3

Which of the following has the least amount of mass?
A)A proton
B)A neutron
C)An electron
D)An atom
E)A molecule
4

When an electron loses energy it
A)flies away from the atom.
B)donates that energy for the bonding of atoms into molecules.
C)moves up to the next energy level (one further away from the nucleus).
D)moves down to the next energy level (one closer to the nucleus).
E)loses the potential energy it once contained.
5

An atom with an incompletely filled outermost energy level is likely to be
A)unable to form bonds with other atoms.
B)reactive.
C)extremely stable.
D)an isotope.
E)bound to carbon.
6

Of the following elements ____________ has the largest atomic mass.
A)iodine
B)hydrogen
C)helium
D)cobalt
E)nitrogen
7

The mass of atoms is measured in units called
A)pounds
B)microns
C)angstroms
D)grains
E)daltons
8

Radioactive decay is the result of
A)the breakdown of the nucleus of an unstable isotope of an atom.
B)electron loss from the outermost energy level of an atom.
C)ionization of calcium containing substances.
D)ozone depletion from the atomsphere.
E)both b and c
9

A possible origin of life on earth is __________.
A)extraterrestrial
B)evolution
C)special creation
D)all of the above
E)b or c only
10

Life on earth originated approximately _________ years ago.
A)6,000
B)60,000
C)3.5 million
D)3.5 billion
E)10 billion
11

A sign of intelligent life from somewhere else in the universe would likely arrive in the form of
A)an easy-to-understand monologue.
B)an patterned pulse that doesn't blend in with the background noise of the universe.
C)actual aliens.
D)a clear radio signal.
E)none of the above
12

A meteorite from Mars collected in Antarctica suggested the presence of ancient bacteria on that planet because
A)of the presence of structures resembling micro-fossils.
B)organic residues were found inside of it and could not have been there due to contamination.
C)biotic combinations of minerals were present.
D)All of the above were present and in combination provided rather convincing evidence that ancient bacteria may have existed on Mars.
E)none of the above
13

Fossil evidence suggests that all life on earth probably arose from which of the following?
A)simple arthropods
B)prokaryotic cells
C)apes
D)herbivores
E)colonial, anaerobic animals
14

An atom with eight electrons and six protons is an example of a(n)
A)molecule.
B)mole.
C)radioactive isotope.
D)ion.
E)polar element.
15

Chemical energy can be stored in the form of
A)extra electrons in the outermost orbital.
B)extra protons in the nucleus of an atom.
C)electrons in "high-energy" orbits.
D)electrons released from high-energy orbital.
E)both a and c
16

When a substance is oxidized in a cell another substance is __________ at the same time.
A)removed
B)oxidized
C)hydrolyzed
D)reduced
E)lysed
17

__________ are the type of bond found in crystals such as table salt.
A)Ionic bonds
B)Covalent bonds
C)Hydrogen bonds
D)Van der Waals
E)Both a and d
18

It takes quite a lot of energy to bring water to a boil. This is due to
A)the covalent bonds in a molecule of water.
B)the hydrogen bonds between adjacent water molecules.
C)the ionic bonds that are broken when water reaches the boiling point.
D)excessive quantities of hydrogen ion found in impure water.
E)both a and d
19

If an atom has four electrons in its second energy level then which of the following must be true?
A)the third energy level must have at least two electrons.
B)the third energy level must be empty.
C)the first energy level must have two electrons.
D)the first energy level must have four electrons.
E)the first energy level must be empty.
F)both b and c
20

A research chemist discovers a new element. She determines that the atoms of this element are particularly reactive. That means that the atom probably
A)has an incompletely filled outer electron orbital.
B)has a filled outer electron orbital.
C)is radioactive.
D)has a high specific heat.
E)has probably been discovered before.
21

Ionic bonding involves
A)the sharing of electrons between two or more atoms.
B)weak bonding between adjacent salt molecules.
C)weak bonding between adjacent water molecules.
D)the attraction of oppositely charged atoms.
E)both a and d
22

One reason that ionic bonds do not play an important role in most biological molecules is that they are
A)incompatible with water.
B)directional.
C)not directional.
D)too strong to be broken in the cell.
E)unable to form in carbon-based molecules.
23

Hydrogen bonding in water is a consequence of
A)the polar covalent nature of water molecules.
B)the nonpolar bonding that occurs between oxygen and hydrogen.
C)excessive hydrogen dissolved in the water.
D)both a and b
E)both a and c
24

Hydrogen bonds are
A)weak bonds that last only a fraction of a second.
B)weak bonds that last indefinitely.
C)weak bonds that hold molecules together.
D)strong bonds that form between adjacent molecules.
E)strong bonds that last for only a fraction of a second.
25

Sweating helps runners in a marathon sweat to cool off. This is because
A)the water molecules in sweat adhere to the skin and have a cooling effect.
B)for every gram of water that evaporates from their bodies, 586 calories of heat are removed.
C)the water lost in sweating reduces body weight, making it easier for them to run.
D)the salt in sweat has a cooling effect on the skin.
E)both a and d
26

A common medium used in the microbiology laboratory is carbohydrate fermentation broth. When introduced to the broth, a bacterium that is capable of fermenting the carbohydrate produces acidic waste products. What could the microbiologist add to the media to slow down changes in its pH?
A)additional acid
B)additional carbohydrate
C)an additional source of nutrients
D)a buffer
E)a substance that is a strong base
27

Which of the following is a complex carbohydrate that is a component of fungi cell walls and insect exoskeletons?
A)terpenes
B)starch
C)chitin
D)steriods
E)ATP
28

__________ are lipids that are a component of animal cell plasma membranes.
A)Terpenes
B)Starch
C)Chitin
D)Steroids
E)ATP
29

__________ are long carbon chains that function as pigments in photosynthesis.
A)Terpenes
B)Starch
C)Chitin
D)Steroids
E)ATP
30

Which of the following is a structural protein found in both birds and rhinos?
A)glycogen
B)cellulose
C)chitin
D)keratin
E)none of the above
31

How do DNA and RNA differ?
A)They have different ribose sugars.
B)DNA is a double-stranded molecule while RNA is single-stranded.
C)Thymine is present in DNA but not in RNA.
D)Uracil is present in RNA but not in DNA.
E)all of the above
32

The bubble model suggests that
A)the building blocks of life were generated inside of bubbles on the ocean's surface.
B)bubbles of amino acids interacted to form more complex proteins on primordial earth.
C)the first simple cells were actually bubbles of ocean water covered by a membrane.
D)bubbles on the ocean's surface contained sufficient oxygen to facilitate chemical reactions.
E)both a and d





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