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Science Midterm
Science Midterm
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#CampbellScience #9thgrade
Flashcards
58 cards
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Practice quiz
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Questions
58
Answers
1
Glucose molecules are to starch as _____ are to proteins.
oils
fatty acids
amino acids
2
What is a carbohydrate?
All of the above
main source of energy
small sugar molecules - large polysaccharides such as starch
compounds made up of C, H, and O atoms
3
Which of the following statements regarding the oxygen atom of a water molecule is true?
Oxygen attracts electrons less strongly than hydrogen atoms
Oxygen is more positively charged than the hydrogen atoms
Oxygen is more electronegative than the hydrogen atoms
4
The four most common elements in living organisms are _________.
Carbon, Nitrogen, Oxygen, Hydrogen
Carbon, Hydrogen, Oxygen, Sodium
Carbon, Nitrogen, Hydrogen, Sodium
Carbon, Nitrogen, Oxygen, Sodium
5
What is the study of all compounds that contain bonds between carbon atoms?
biochemistry
organic chemistry
carbon chemistry
carbon skeleton
6
A molecule with C
55
H
110
O
55
is probably a(n)
steroid
polysaccharide
protein
oil
7
Which is true about matter?
All matter is composed of elements
All matter has mass
All of the above
All life is composed of matter
8
This bond is an equal sharing of electrons.
hydrogen bonding
polar covalent bond
nonpolar bond
Ionic bond
9
Which of the following particles is found in the nucleus of an atom?
only protons
neutrons and electrons
only electrons
protons and neutrons
10
What is the general function of enzymes within a cell?
to promote the synthesis of monomers
to speed up chemical reactions
to stop chemical reactions
11
What is the correct order?
ecosystem-community-population-organism-organ system-organ
ecosystem-community-population-organ system-organism-organ
organism-organ system-organ-population-ecosystem
community-population-organ-organ system- organism-ecosystem
12
What is the principle structural molecule in cell walls of plants and algae?
starch
glycogen
cellulose
13
In the equation 2 H
2
O+O
2
> 2 H
2
O, the H
2
molecules are ______ and the H
2
O molecules are ______
used ... stored
reactants ... products
all of the above
created ... destroyed
14
The hydrogen atoms of a water molecule are bonded to the oxygen atom by _____ bonds.
polar covalent
ionic
hydrogen
covalent
15
Proteins are molecules that contain N, C, H, O
True
False
16
Which is the carboxyl group?
-COOH
-O-H
-NH2
17
The dynamics of a(n) ____________ involve flow of energy and recycling of nutrients.
decomposer
animal
ecosystem
consumer
18
The storage form of carbohydrates is __________ in animals & __________ in plants
glycogen... starch
cellulose... glycogen
starch.... glycogen
glycogen... cellulose
19
What breaks down bonds between monomers by adding water?
hydrolysis
dehydration synthesis
20
Water molecules are held together by ________ bonds.
covalent
polar covalent
ionic
hydrogen
21
What causes a bacterium to copy its DNA and divide it in 2 to form 2 identical bacteria?
Reproduction
Regulation
Energy Processing
Order
22
The sodium atom contains 11 electrons, 11 neutrons and 12 protons. What is the mass number?
23
121
22
34
23
Groups that tend to participate in chem. reaction + attach to part of C skeletal backbone are?
functional groups
groups that function
I don't even know
functionary grouops
24
An oil may be converted into a substance that is solid at room temperature by....
cooling it, so that double bonds form and fats solidify
Adding hydrogens, decreasing the # of double bonds
25
This is caused by weak bonds between the positive hydrogen atom and other negative atoms.
covalent bonds
hydrogen bonding
all of the above
Ionic bonds
26
Which is the Amino group?
-NH2
-COOH
-O-H
27
A solution with a pH of 7 is _________.
strongly acidic
neutral
weakly basic
weakly acidic
28
What is a lipid?
all of the above
fats that are energy storage molecules
are long chains of carbon bonds
have no specific ratio: H, C, O
29
Phospholipids are a major component in biological membrane.
True
False
30
which is the hydroxyl group?
-COOH
-NH2
-O-H
31
Most animals cannot break down cellulose, whereas monomers are easily digested
False
True
32
To get energy from foods, organisms take in oxygen from the air and release ______.
heat
oxygen
carbon dioxide
Carbon monoxide
33
What links monomers to other monomers/polymers by taking a molecule of H
2
O?
Hydrolysis
Dehydration Synthesis
34
Table salt is formed when _______________.
sodium donates its single outer electron to chlorine
sodium and chlorine share electrons to form a bond
A hydrogen bond forms between sodium and chlorine
chlorine gives an electron to sodium
35
Energy enters the ecosystem as light and exits as _______.
Light
carbon dioxide
Heat
oxygen
36
Compared to a solution of pH 3, a solution of pH 1 is _____.
10 times more acidic
100 times more acidic
10 times more basic
100 times more basic
37
Bacteria and fungi function as ____ that convert dead matter into simpler nutrients.
nutrients
consumers
animals
decomposers
38
A hydrogen bond has one electron, how many covalent bonds can hydrogen form?
2
1
4
none
39
Fluoride is added during the municipal water treatment process in order to help ______.
prevent goiter
prevent the development of mental retardation
prevent the growth of bacteria
reduce tooth decay
40
The exchange of matter and energy in an ecosystem involves a complex web of ______.
interactions
nutrients
animals
energy
41
In the equation: 2H
2
+ O
2
> H
2
0
only H20 is a compound
H2, O2, and H2O are all elements
They are all compounds
42
What feature of fats makes them hydrophobic?
Fats have carboxyl groups
Fats include one glycerol molecule
Fats have polar fatty acids
fats have nonpolar hydrocarbon chains
43
This bond is formed between metals and nonmetals.(Metals GIVE and nonmetals TAKE electrons)
ionic bond
covalent bond
hydrogen bond
nonpolar bond
44
What is the main job of a carbohydrate?
it is used in hydrolysis
to link to another carbon chain
it is energy storage molecules
45
This is an unequal distribution of electrons; one is partly positive, one is partly negative.
ionic bond
polar covalent bond
nonpolar bond
covalent bond
46
What is the atomic mass of an atom that has 6 protons, 6 neutrons, and 6 electrons?
18
6
36
12
47
What are electrons in the outer most shell that determine chemical properties?
consumers
Valence electrons
none of the above
Valient electrons
48
This bond is 2 plus nonmetals that share valence electrons.
hydrogen bond
Ionic bond
Covalent Bond
polar covalent bond
49
What is the long term energy storage in ANIMALS?
Glycogen
Cellulose
Starch
50
A(n) _______________ forms when 2 atoms share electrons
covalent bond
hydrogen bond
ionic bond
ion
51
Which of the following best describes an atom?
all of the above
The number of electrons in the atom
the number of protons in the atom
the number of neutrons in the atom
52
what donates H+ ions when conditions are too basic and accepts H+ ions when they are too acidic
an element
a buffer
producers
consumers
53
What is a long term energy storage in PLANTS?
starch
glycogen
cellulose
54
Something that is hydrophobic is....
generally not soluble in water
usually soluble in water
in the middle about water
55
What is order?
The brain of a mouse is more complex than a computer
The most sophisticated computer is more complex than a mouse
56
Which of the following is a trace element in the human body?
nitrogen
zinc
hydrogen
oxygen
57
Plants absorb minerals from the _____.
soil
sun
air
ground
58
A radioactive isotope is an isotope that ________.
is stable
decays
has more protons than the common variant of the element
