WorksheetsFirst Semester Exam
Total questions: 50
Worksheet time: 25mins
Name
Class
Date
1.
A group of organisms of different species living together in a particular place is called a
a)
community
b)
biome
c)
population
d)
habitat
2.
The physical location of an ecosystem in which a given species lives is called a
a)
habitat
b)
trophic level
c)
community
d)
food zone
3.
Ecology is the study of the interaction of living organisms
a)
with one another and their biotic factors.
b)
and their communities.
c)
with one another and their physical environment.
d)
and the food they eat.
4.
When an organism dies, the nutrients in its body
a)
can never be reused by other living things.
b)
are immediately released into the atmosphere.
c)
are released by the action of decomposers.
d)
None of these
5.
Food webs are more commonplace than food chains because
a)
many animals that comprise the links in a food chain are migratory.
b)
organisms almost always eat, and are eaten by, many different organisms.
c)
over time, food chains always become food webs.
d)
None of these
6.
Animals that feed on plants are at least in the
a)
first trophic level.
b)
third trophic level.
c)
second trophic level.
d)
fourth trophic level.
7.
commensalism : one organism ::
a)
parasitism : both organisms
b)
competition : both organisms
c)
predation : neither organism
d)
mutualism : both organisms
8.
Refer to the illustration above. Leopard seals are
a)
producers.
b)
herbivores.
c)
omnivores.
d)
carnivores
9.
Refer to the illustration above. Killer whales feed at the
a)
first and second trophic levels.
b)
second and third trophic levels.
c)
second trophic level only.
d)
third and fourth trophic levels.
10.
As a population reaches its carrying capacity, there is an increase in competition for
a)
food
b)
mates
c)
shelter
d)
All of these
11.
Refer to the illustration above. During which time period are the birth rate and death rate equal?
a)
Period A
b)
Period B
c)
Period C
d)
Period D
12.
Refer to the illustration above. The rate of growth of a population is represented by r. During which time period will r = 0?
a)
Period A
b)
Period B
c)
Period C
d)
Period D
13.
Which of the following does not represent a population?
a)
all the robins in Austin, Texas
b)
all the grass frogs in the pond of Central Park, New York City
c)
all the birds in Chicago, Illinois
d)
all the earthworms in Yosemite National Park
14.
Which factor contributed most to the exponential growth of the human population?
a)
more food, better hygiene
b)
higher fertility rates
c)
higher birth rates
d)
increased immigration
15.
The smallest particle of matter that can retain the chemical properties of carbon is a(n)
a)
carbon molecule.
b)
carbon atom.
c)
carbon macromolecule.
d)
element.
16.
A substance that is composed of only one type of atom is called a(n)
a)
Nucleus
b)
element
c)
cell
d)
molecule
17.
A molecule that has a partial positive charge on one side and a partial negative charge on the other side is called a
a)
nonpolar molecule.
b)
charged molecule.
c)
polar molecule.
d)
bipolar molecule.
18.
All organic compounds contain the element
a)
carbon
b)
calcium
c)
nitrogen
d)
sodium
19.
Long chains of amino acids are found in
a)
carbohydrates
b)
proteins
c)
lipids
d)
sugars
20.
The shape of a protein is primarily determined by
a)
the type and sequence of its amino acids.
b)
its size.
c)
its cell location.
d)
None of these
21.
DNA stores
a)
fat
b)
protein
c)
genetic information
d)
carbohydrates
22.
Refer to the illustration above. Which structure immediately identifies this cell as a eukaryote?
a)
structure 1
b)
structure 2
c)
structure 3
d)
structure 4
23.
Refer to the illustration above. In eukaryotic cells, chromosomes are found in
a)
Structure 1
b)
Structure 2
c)
Structure 3
d)
Structure 4
24.
Refer to the illustration above. The cell shown is probably an animal cell because it
a)
has mitochondria.
b)
has a cell membrane.
c)
does not have a cell wall.
d)
does not have a nucleus.
25.
One difference between prokaryotes and eukaryotes is that
a)
nucleic acids are found only in prokaryotes.
b)
mitochondria are found in larger quantities in eukaryotes.
c)
Golgi vesicles are found only in prokaryotes.
d)
prokaryotes do not have a nucleus.
26.
A structure within a eukaryotic cell that performs a specific function is called a(n)
a)
organelle.
b)
tissue.
c)
organ tissue.
d)
biocenter.
27.
The cell membrane
a)
allows materials to enter and leave the cell.
b)
encloses the contents of a cell.
c)
is selectively permeable.
d)
All of these
28.
cell : cell membrane ::
a)
nucleus : chromosome
b)
chromosome : DNA
c)
nucleus : nuclear envelope
d)
cell : DNA
29.
The packaging and distribution center of the cell is the
a)
nucleus.
b)
central vacuole.
c)
Golgi apparatus.
d)
nuclear envelope.
30.
In a cell, proteins are made on the
a)
mitochondria.
b)
nucleus.
c)
ribosomes.
d)
cell membrane.
31.
A cell that requires a lot of energy might contain large numbers of
a)
chromosomes.
b)
mitochondria.
c)
vacuoles.
d)
lysosomes.
32.
The organelles associated with plant photosynthesis are the
a)
mitochondria.
b)
Golgi apparatus.
c)
chloroplasts.
d)
vacuoles.
33.
Diffusion is the movement of a substance
a)
only through a lipid bilayer membrane.
b)
from an area of low concentration to an area of higher concentration.
c)
only in liquids.
d)
from an area of high concentration to an area of lower concentration.
34.
The diffusion of water into or out of a cell is called
a)
solubility.
b)
selective transport.
c)
osmosis.
d)
endocytosis.
35.
Unlike passive transport, active transport
a)
requires energy.
b)
moves substances down their concentration gradient
c)
does not involve carrier proteins.
d)
All of these
36.
Many autotrophs obtain the energy they need for metabolism through
a)
fermentation.
b)
cellular respiration.
c)
photosynthesis.
d)
eating food.
37.
When living cells break down food molecules, energy is
a)
stored as ADP.
b)
released as heat.
c)
stored as ATP.
d)
stored as ATP and released as heat
38.
photosynthesis : oxygen ::
a)
oxygen : carbon dioxide
b)
cellular respiration : oxygen
c)
cellular respiration : carbon dioxide
d)
cellular respiration : enzymes
39.
During photosynthesis, the series of reactions that create the complex carbohydrates needed for energy and growth is called
a)
the Calvin cycle.
b)
the electron transport chain.
c)
the Krebs cycle.
d)
None of these
40.
When glycolysis occurs,
a)
a molecule of glucose is split.
b)
some ATP is produced.
c)
two pyruvates are made.
d)
All of these
41.
Cellular respiration takes place in the two stages of:
a)
glycolysis and fermentation.
b)
electron transport chain, then fermentation.
c)
glycolysis, then aerobic respiration.
d)
None of these
42.
Cells produce ATP most efficiently in the presence of
a)
carbon dioxide.
b)
water.
c)
oxygen.
d)
glucose.
43.
Which of the following shows the correct sequence of the cell cycle?
a)
C - M - G1 - S - G2
b)
G1 - S - G2 - M - C
c)
S - G1 - G2 - M - C
d)
None of these
44.
The synthesis (S) phase is characterized by
a)
DNA replication.
b)
cell division.
c)
replication of mitochondria and other organelles.
d)
the division of cytoplasm.
45.
Mitosis is the process by which
a)
microtubules are assembled
b)
cytoplasm is divided.
c)
the nucleus is divided into two nuclei
d)
the cell rests.
46.
The first three phases of the cell cycle are collectively known as
a)
cellular respiration.
b)
mitosis.
c)
telophase.
d)
interphase.
47.
The phase of mitosis that is characterized by the arrangement of all chromosomes along the equator of the cell is called
a)
telophase.
b)
anaphase.
c)
metaphase.
d)
prophase.
48.
The phase of mitosis that is characterized by the condensing of chromatin, the disappearance of the nuclear membrane, and the formation of the spindle apparatus is
a)
telophase.
b)
anaphase.
c)
metaphase.
d)
prophase.
49.
Refer to the illustration above. Which of the following correctly indicates the order in which these events occur?
a)
A, B, C, D
b)
B, A, C, D
c)
C, B, A, D
d)
A, C, B, D
50.
Refer to the illustration above. During which stage do the centromeres divide?
a)
A
b)
B
c)
C
d)
D
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