Unit 3: Energy and Enzymes
Study Sheet
DIRECTIONS: This worksheet is a guide for your studying and represents what your
Biology teachers expect you to have learned and be able to do by the end of this
unit.
SUPER STUDENT TIP: Excellent students have the practice of completing this
worksheet as they go to help them reinforce what they’re learning (and save
themselves time at the end of the unit).
Key Terms:
heterotroph
autotroph
chemical energy
photoautotrophs
chemosynthesis
producer
consumer
top carnivore
decomposer/detritivore
food web
energy pyramid
trophic level
abiotic
biotic
enzyme
active site
substrate
activation energy
reactant
product
synthesis
decomposition
ATP
ADP
ecosystem
community
population
competitive inhibitor
photosynthesis
cellular respiration
Bromthymol Blue (BTB)
endothermic
exothermic
Can you answer the following questions and if not, do you know what assignment(s) to look at to find the answer?
Unit 3 Essential Question: How living things obtain energy they need to survive?
Learning Target
Know the
Know where to
You should be able to …
answer?
find the answer?
Tell why organisms need energy and how they obtain and release it.
 What is the difference between heterotrophs, autotrophs, and
photoautotrophs?

How do plants and autotrophs obtain energy?

What is the relationship between photosynthesis and cellular
respiration? Create a Venn Diagram to compare and contrast the two
processes.

Where does the mass of a plant come from?

Describe how the indicator BTB can be used to show that photosynthesis
and cellular respiration are occurring. What does this indicator actually
measure? Why does it show rates of photosynthesis and cellular
respiration?
Describe how energy flows through an ecosystem.
 What is the difference between living and non-living environmental
factors? *Be able to identify abiotic and biotic factors.

What is the difference between ecosystems, communities, and
populations?



Learning Target
You should be able to …
What does a food web show? (specifically!)
What do the arrows in a food web represent?
*Be able to construct a food web for a given ecosystem.
Define and identify producers and primary, secondary, and tertiary
consumers.

What does an energy pyramid show? Why is it represented in the shape
of a pyramid?

Why is energy “lost” between trophic levels? Where does it go?

What organisms can be found at each level of an energy pyramid?
*Be able to construct a food pyramid for a given ecosystem’s food web.

How does a pyramid of energy differ from a pyramid of biomass and a
pyramid of numbers? Why are each in the shape of a pyramid?

Make a claim about what happens to energy in an ecosystem when the
ecosystem is disrupted. Give at least 3 supporting pieces of evidence.
Describe the importance and function of enzymes.
 How do enzymes change the progress of a chemical reaction?
*Be able to identify and construct a graph of a chemical reaction with
and without an enzyme.



What elements of a graph of enzyme activity represent the starting
ingredients and results of a chemical reaction?
What physically happens that allows an enzyme to catalyze a chemical
reaction?
What factors affect how well an enzyme works? How do they affect how
well the enzyme works?
Summarize the importance of ATP in storing and releasing energy.
 Where is energy stored in an ATP molecule?
 How is ATP “recycled”?


Others:

How does ATP differ from ADP? Give the chemical equations for how
each are formed and tell whether they are endothermic or exothermic
reactions. Explain how you know.
Know the
answer?
Know where to
find the answer?