In order to measure population density, what two factors are required?

area of the space and the number of individuals

What is the function of epithelial tissue in the human stomach?

provide protection and allow secretion and absorbtion

The island of Surtsey formed near Iceland by a series of volcanoes. Which of these processes occurred first on Surtsey?

Lichens converted volcanic rock into soil.

The graph shows the energy involved in three chemical reactions. Reaction 3 in the graph

probably occurred in the presence of an enzyme

Which of these describes a polymer?

large molecule made of smaller subunits

What is the relationship between photosystems and Calvin Cycle?

photosystems transfers energy to Calvin cycle through ATP and NADPH

Which of these describes the structure of a nucleic acid?

chain of monomers composed of a sugar, phosphate group, & nitrogenous base

What is the best description of biomass?

the mass of the living and dead organisms in a given area

Which of the following are most important for an organism to maintain homeostasis?

behaviors and negative feedback

What is the role of cholesterol in the cell membrane?

It prevents the membrane from being solid or too fluid.

What do the water, carbon, and nitrogen cycles have in common?

required by all living things and involved in many processes

Why would an alder tree not be considered a pioneer species? Choose the correct answer.

smaller organisms come before trees in succession

Which of these statements best describes the process of photosynthesis?

chloroplasts absorb sunlight and store chemical energy

What might happen if an organism with type III survivorship were introduced into a new environment with no predators?

Its population would increase rapidly.

Which statement is supported by the diagram?

Compounds can have different properties than the elements that make up the

What does a pyramid of numbers display?

the number of organisms in an ecosystem

What are the main differences between plant and animal cells?

plant cells have cell walls and chlorplasts; animal cells do not

Which of these is not true regarding the dark reactions of photosynthesis?

use water as an electron source

Which of the following describes the charges in a water molecule?

oxygen - slight negative hydrogen - slight positive

Which does NOT happen in the Krebs Cycle?

Glucose is broken down into 2 pyruvate molecules

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BIO DEM Semester 1 EXAM MAISON

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Answers

1
Which chemical equation best represents the process of photosynthesis?
6CO2 + O2 ¦ C6H12O6 + 6O2 + H2O
C6H12O6 + 6O2 ¦ 6CO2 + 6H2O
C6H12O6 + 6H2O ¦ C6H12O6 + 6O2
6CO2 + 6H2O ¦ C6H12O6 + 6O2
2
Fossil fuels are part of which cycle?
phosphorus
nitrogen
carbon
oxygen
3
What tropic level is the killer whale at?
the 1st and 2nd
the 3rd and 4th
only the 2nd
only the 3rd
4
Which of these organelles can be found in the cytoplasm and on the surface of the endoplasmic reticulum?
centrioles
ribosomes
centrosomes
mitochandria
5
Which of these are products of the light dependent reactions?
ATP and NADPH
oxygen and NADPH
water and oxygen
oxygen and ATP
6
Specialized structures that work together inside a cell are called ___.
eukaryotes
organelles
nuclei
prokaryotes
7
The specialized structures of different types of cells are related to the cell's ____.
homeostasis
equilibrium
function
energy
8
In order to measure population density, what two factors are required?
area of the space and the number of individuals
the perimeter of the area and the number of individuals
the birth and death rates
carrying capacity and the area of the space
9
The function of the light dependent reactions is to __.
form water molecules
release carbon dioxide
build sugars
capture and transfer energy
10
What is the function of epithelial tissue in the human stomach?
contract to allow movement in the stomach
receive and transmit impulses and process information
provide protection and allow secretion and absorbtion
support and bind other tissues together
11
The island of Surtsey formed near Iceland by a series of volcanoes. Which of these processes occurred first on Surtsey?
Plants grew on the island.
Lichens converted volcanic rock into soil.
A complex ecosystem developed.
Animals moved onto the island.
12
A cell that requires a lot of energy might contain large numbers of ___.
chromosomes
mitochandria
vacuoles
lysosomes
13
The graph shows the energy involved in three chemical reactions. Reaction 3 in the graph
is slower than Reaction 2
probably occurred in the presence of an enzyme
requires more activation energy than reaction 2
is the same as reaction 1 but faster
14
Which of these describes a polymer?
a molecule that catalyzes a reaction in living organisms
large molecule made of smaller subunits
a molecule composed of hydrogen, carbon, and oxygen
molecule with a polar head and nonpolar tails
15
What is the relationship between photosystems and Calvin Cycle?
photosystems builds sugars with carbon dioxide produced by the Calvin cycle
photosystems transfer hydrogen ions and carbon
photosystems transfers energy to Calvin cycle through ATP and NADPH
photosystems produces ATP for Calvin cycle
16
Which of these describes the structure of a nucleic acid?
several fatty acids linked together
a long chain of monosaccharides
chain of monomers composed of a sugar, phosphate group, & nitrogenous base
a hydrophilic head containing a glycerol and two hydrophobic tails
17
Which of these is the site of the photosystems in the light-dependent reactions of photosynthesis?
mitochandrial matrix
ATP Synthase
thylakoid membrane
stroma
18
What is the best description of biomass?
the unused material excreted as waste in an ecosystem
the producer to consumer ratio in an ecosystem
the mass of the living and dead organisms in a given area
the mass of all living things on Earth
19
Which of the following are most important for an organism to maintain homeostasis?
behaviors and negative feedback
reproduction and development
interactions with living things
dependence on other organisms
20
Where is the site of the photosystems in the light-dependent reactions?
mitochandrial matrix
stroma
ATP Synthase
thylakoid membrane
21
What is the role of cholesterol in the cell membrane?
It prevents substances from entering or leaving the cell.
It prevents the membrane from being solid or too fluid.
It forms a rigid structure that maintains cell shape.
It causes osmosis to occur across the membrane.
22
Transpiration in a tree is part of which cycle?
nitrogen cycle
water cycle
phosphorous cycle
carbon cycle
23
The body works to maintain homeostasis in response to what conditions?
tissue and cell formation
cell differentiation and determination
internal and external changes
production of key vitamins
24
What do the water, carbon, and nitrogen cycles have in common?
largest reserves are always in organisms
substances have to pass through organisms to complete the cycle
required by all living things and involved in many processes
ocean is a reservoirs for all three substances
25
ATP (adenosine triphosphate) stores energy in the bonds between its __________.
phosphate groups
hydrogen atoms
nucleotides
carbon atoms
26
Internal control systems maintain homeostasis by regulating which of these?
external conditions
receptors in the body
the body's control center
pH of body fluids
27
The membrane bound sac used to transport substances into and out of cells is a ___.
lysosome
pump
vesicle
macrophage
28
If leopard seals only eat meat they are ____.
carnivores
producers
herbivores
omnivores
29
What is the name of the negatively charged particles in an atoms?
protons
electrons
neutrons
prions
30
Why would an alder tree not be considered a pioneer species? Choose the correct answer.
it is not one of the trees that make up the final forest
smaller organisms come before trees in succession
pioneer species are always animals
alder trees are a form of lichen
31
The light-independent reactions of photosynthesis need __________.
carbon dioxide
water
oxygen
cellulose
32
Which provides the most energy in ecosystems?
gereralists
producers
carnivores
keystone species
33
Human skin cells differ from human muscle cells because they have different ____.
ways of dividing
life processes
genes
functions
34
Where do almost all producers get their energy?
herbivores
sunlight
hydrothermal pools
decaying matter
35
Which of these does homeostasis most directly relate?
evolution
interacting systems
stability
scale and structure
36
The long-term effects of a disruption of homeostasis include ___.
regulation of the internal environmnet
destruction of organs
establishment of feedback mechanisms
the immune system taking control
37
Which of these statements best describes the process of photosynthesis?
plants use oxygen to make simple sugars
chlorphyll builds sugars in the thylakoid
chloroplasts absorb sunlight and store chemical energy
light breaks down water molecules and releases carbon dioxide
38
Which of these shows the greatest degree of structural organization?
bacteria
viruses
multicellular life
unicellular life
39
What might happen if an organism with type III survivorship were introduced into a new environment with no predators?
It would become extinct.
Its population would increase rapidly.
Its survivorship would change to type I.
Its birth rate would decrease.
40
What two biogeochemical cycles depend directly on photosynthesis?
carbon and phosphorous cycle
nitrogen and phosporous cycle
oxygen and carbon cycle
water and oxygen cycle
41
Which statement is supported by the diagram?
Two elements will always combine in the same ratios when they react to form
Compounds can have different properties than the elements that make up the
Compounds can most easily form between elements that have full outer energy
Atoms of most elements become less stable when they bind to form compounds
42
What does a pyramid of numbers display?
a network of feeding relationships
the amount of biomass in an ecosystem
the number of organisms in an ecosystem
a chain of feeding relationships
43
Carbon can move through the environment and organisms in a cycle because living and nonliving things interact in ______.
cells
species
ecosystems
organisms
44
What type of carbon-based molecule is the first to be broken down by the body's cells to provide a source of energy?
protein
amino acid
fat
carbohydrate
45
What are the main differences between plant and animal cells?
plant cells are eukaryotes, animal cells are not
animal cells have cell walls and chloroplasts; animals cells do not
animal cells are eukaryotes and plant cells are not
plant cells have cell walls and chlorplasts; animal cells do not
46
What process in a mitochondria provides the ETC in cellular respiration with energy?
chloryphyll
ATP Synthase
Krebs cycle
glycolysis
47
Which of these is not true regarding the dark reactions of photosynthesis?
use water as an electron source
do not require light
generate sugars
require ATP and NADPH
48
Which of the following describes the charges in a water molecule?
oxygen - slight positive hydrogen - slight negative
oxygen - strong positive hydrogen - slight positive
oxygen - slight negative hydrogen - strong negative
oxygen - slight negative hydrogen - slight positive
49
How does the liver help to regulate glucose levels in the blood?
by storing glucose
by excreting excess water
by releasing glucagon
by producing insulin
50
Which does NOT happen in the Krebs Cycle?
a carbon molecule is recycled
Pyruvate is broken down into a 2 carbon molecule and CO2
Glucose is broken down into 2 pyruvate molecules
Citric Acid is broken down
51
If a population has no known predators and plenty of available resources, how might that population change?
It would remain the same.
It would decrease.
It would spread out.
It would increase.
52
Which of these statements is true of ATP?
it converts sunlight into chemical energy
it contains less stored energy than ADP
it stores energy for cellular processes
it stores energy as glucose
53
A herd of caribou has more births than deaths. What will most likely happen to the size of the herd?
It will stay the same.
It will increase and then decrease.
It will increase.
It will decrease.
54
The smallest particle of matter that can retain the chemical properties of carbon is a carbon __________.
macromolecule
atom
element
molecule
55
Which of these is an example of a density-independent limiting factor?
a food shortage
a parasite
a natural disaster
a decrease in prey
56
What process is part of the hydrologic cycle?
decomposition
sedimentation
nitrification
transpiration
57
What is the best explanation for the difference between a eukaryote and a prokaryote?
eukaryotes are more complex and can be either unicellular or multicellular
eukaryotes have simpler cells and can only be unicellular
eukaryotes are simpler cells and can be either unicellular or multicellular
eukaryotes have more complicated cells and can only be multicellular
58
The function of the light-dependent reactions is to __________.
release carbon dioxide
capture and transfer energy
build sugars
form water molecules
59
Bobcats are generally solitary animals and establish territories. What type of population dispersion do they have?
competitive dispersion
clumped dispersion
random dispersion
uniform dispersion
60
What is the main role of fermentation?
allows anaerobic production of ADP
converts glucose into pyruvate and NADH
to allow glycolysis to continue
produces lactic acid
61
Which of these describes the nuclear membrane?
contains pores that allow only certain molecules to pass.
rigid and impermeable
allows all molecules to pass across it into the nucleus
identical in composition to the cell membrane
62
In 1988 several large forest fires occurred in Yellowstone National Park. What process occurred after these fires?
symbiotic succession
secondary succession
pioneer succession
primary succession
63
Which of these describes the primary structure of a protein?
the arrangement of multiple polypeptide chains
the three-dimensional shape of the protein
the folding of the protein into sheets and spirals
the sequence of the amino acids in the protein
64
Which of these can be both primary and secondary consumers?
carnivores
detritivores
herbivores
omnivores
65
Why is NADPH is important in photosynthesis?
provides high energy electrons used to store energy in organic molecules
becomes oxidized to form NADP
provides additional oxygen atoms from the breakdowns of water molecules
is needed to form chlorophyll and carotenoids
66
The part of cellular respiration that needs oxygen takes place inside the ___.
nucleus
cytoplasm
mitochondria
thylakoid
67
How much energy is available to the organisms at level C?
All of the energy in level A minus the energy in level B
50% of the energy in level B
all of the energy in level A and B
5-20% of the energy in level B
68
Refer to the illustration. During which time period are the birthrate and death rate equal?
C
B
D
A
69
Two products of the Kreb's Cycle are ___.
ATP and CO2
ATP an O2
H2O and CO2
ADP and H2O
70
On a hot day, which of these is an outward sign that thermoregulation is taking place?
sunburn
dry mouth
slow breathing
sweating
71
Which of these is NOT true regarding the dark reactions of photosythensis?
do not reqquire light
use water on electron source
generate sugars
require ATP and NADPH
72
Water is a polar molecule because ______.
it has a charge
different parts of the molecule have slightly different charges
it contains two hydrogen atoms for each oxygen atom
it does not have a charge
73
As a population reaches carrying capacity, resources become scarce. Which would increase within the population?
birthrate
nesting sites
available shelter
competition
74
When a giraffe eats leaves from a tree, it incorporates the leaves into its own ___.
community
biomass
niche
biome
75
What is the role of a receptor in helping an organism maintain homeostasis?
compares current conditions with ideal values for those conditions
receives messages sent by the control center
carries out a response to restore internal conditions
detects stimuli and sends information to the control center
76
When would the carrying capacity of an area most likely stay the same?
after a period of stability
when diversity increases
when resources increase
after flood or a fire
77
Which bonds could a single carbon atom have?
5 single bonds
2 triple bonds
a triple bond and a single bond
a triple bond and a double bond
78
When an ecosystem loses biodiversity, how does it change?
It becomes less resilient.
It becomes more efficient.
It becomes fragmented.
It becomes easier to live in.
79
Which of these is a central purpose of steroids in mammals?
they provide most of the energy for a cell
they break down bonds in polymers by adding water
the serve as chemical messengers
they form protective coatings
80
Atoms connected by covalent bonds share ___.
carbon and oxygen
pairs of electron
hydrogen ions
ionic compounds
81
In the lock-and-key model of enzyme function shown in the diagram, what is happening in step 2?
The substrates are beginning to bind to the enzyme.
The catalyzed reaction is releasing a product.
The active sites are restructuring the enzyme.
The enzyme is causing new bonds to form between the substrates.
82
Photosynthesis : Oxygen AS Cellular Respiration : ____
ATP
Carbon Dioxide
Enzymes
Oxygen
83
The body's internal environment must stay ___.
exactly the same at all times
the same as its external environment
away from sudden outside temperature changes
within narrow ranges that support human life
84
Each level in a food chain contains less energy than the one below because some energy is ____.
consumed by carnivores
lost as heat
incorporated into biomass
added to the system
85
This is the equation for __.
production of ATP
cellular repiration
cellular respiration
photosynthesis
86
When does succession occur?
only after a glacier retreat
as a previously existing community is replaced
as one generation of organisms replaces the previous one
after a new food web is established
87
Changes in temperature and pH can decrease an enzyme’s activity by breaking ____.
hydrogen bonds
sulfer-sulfer bonds
amino acids
peptide bonds
88
The light-dependent reactions of photosynthesis need __.
water
carbon dioxide
oxygen
cellulose
89
Bacteria are important in the nitrogen cycle because they ___.
help convert nitrogen into a form that organisms can use
decay and form fossil fuels
respire, returning carbon dioxide into the atmosphere
produce sugars plants can use
90
Which of these is an example of a positive feedback loop?
platelets stimulating more platelets during clotting
plants closing their stomata in response to water loss
the release of glucose by the lover in response to low blood sugar
the removal of salt from a saltwater fish during osmoregulation
91
From the information that two atoms have two different proton counts , you can conclude that the atoms ___.
represent different isotopes of one element
are likey to react violently with each other
might be different ions of the same element
belong to two entirely different elements
92
What happens to the sugars that are made during photosynthesis?
they move directly into an ETC
they make ATP
go into the Calvin cycle
they can be used for cellular respiration
93
What happens during nitrogen fixation?
bacteria absorb ammonia and excrete ammonium
bacteria grow on nodules on plants roots
bacteria convert gaseous nitrogen into ammonia
bacteria change ammonium into nitrate
94
What is the function of oxygen in cellular respiration?
to give energy to the Krebs cycle
to deliver hydrogen ions to the ETC
to pick up electrons at the end of the ETC
to provide oxygen for the production of carbon dioxide
95
The carbon cycle makes carbon compounds continuously available in an ecosystem and delivers ___.
water to all organisms
carbon dioxide to animals in the ecosystem
chemical energy to organisms within the ecosystem
light energy to autotrophs
96
When humans and animals die, phosphorous ___.
returns to the soil
is denitrified
is dissolved in water
evaporates into the atmosphere
97
Which type of organism would be most likely to have a type II survivorship curve?
one that protects and cares for its young
one that has high birth and infant mortality rates
one that is preyed upon throughout its life
one that preys on small mammals
98
Coral reef is a low-resistance species. How would coral reefs be affected if global ocean temperatures increased?
They would decline.
They would grow.
They would be unaffected.
They would all die.
99
When fatty acids cannot pack together tightly enough to make a solid fat, they have ________.
no double carbon bonds
more polar molecules
very little glycerol
fewer hydrogen atoms
100
What process would bacteria living near a heat vent on the ocean floor use to build carbon based molecules like sugar?
chemosynthesis
light independent reactions
fermentation
cellular respiration

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