Dorchester County Public Schools
Biology
Unit 3 Exam: Energy Transformation in Cells

Multiple Choice
Identify the choice that best completes the statement or answers the question.

	1.	Elodea is a fresh water plant. What energy source is used by Elodea?
a.	Heat	c.	Oxygen	
b.	Light	d.	Carbon dioxide	

	2.	
Scientists have recently discovered a new species that lives attached to the side of a tree. An organism from this new species
·	is multicellular
·	has cell walls
·	has vascular tissues
·	makes its own food
·	has structures that absorb moisture from the air 
The scientists put the organism in a sealed glass container and placed it in the sunlight for several hours. Which of these increased inside the container?	

a.	Water	c.	Oxygen gas	
b.	Nitrogen gas	d.	Carbon dioxide gas	

	3.	Energy from sunlight is trapped by chlorophyll located in the _____.
a.	citric acid cycle	c.	electron transport chain	
b.	mitochondria	d.	thylakoid membranes of chloroplasts	

	4.	Which of the following equations best represents photosynthesis?
a.	C + O2 + H2O ® CO2 + HOH + Light	c.	6C + 6H2O + Light® C6H12O6	
b.	6CO2 + 6H2O + Light ® C6H12O6 + 6O2	d.	C6H12O6 ® 6CO2 + 6H2O + Light	

	5.	Cells store energy when _____.
a.	the third phosphate group breaks off from an ATP molecule to make ADP	
b.	they break down sucrose to glucose and fructose	
c.	a third phosphate group is bonded to an ADP molecule to make ATP	
d.	ions are released into the bloodstream	

	6.	Which of the following is the main energy source for cellular respiration?
a.	Amino Acids	c.	Nucleic Acids	
b.	Carbohydrates	d.	Lipids	

	7.	One of the organelles in a eukaryotic cell releases energy from sugars.  What is this process called?
a.	Cellular Respiration	c.	Photosynthesis	
b.	Transpiration	d.	Chemosynthesis	

	8.	In a recent experiment, scientists studied the effects of increased carbon dioxide levels on the growth of pine trees.  The scientists observed that increased levels of carbon dioxide resulted in an increase in the average circumference of the tree trunks.  The change in circumference is a result of the process of 
a.	Osmosis	c.	Transpiration	
b.	Adaptation	d.	Photosynthesis	

	9.	A scientist wants to study photosynthesis in a newly discovered species.  Which of these cell structures should the scientist study?
a.	Chloroplasts	c.	Ribosomes	
b.	Vacuoles	d.	Mitochondria	

	10.	Some organisms that live in the intestines of cows do not require oxygen to survive.  Which of these best describes the process by which these organisms obtain energy?
a.	Osmosis	c.	Anaerobic Respiration	
b.	Mitosis	d.	Aerobic Respiration	

	11.	Which of these statements about photosynthesis and respiration is true?
a.	Both processes produce food.	c.	Photosynthesis produces oxygen; respiration does not.	
b.	Both processes release energy from food.	d.	Photosynthesis produces carbon dioxide; respiration does not.	

	12.	What molecules control the reaction rate of photosynthesis?
a.	Nucleic Acid	c.	Enzymes	
b.	Lipids	d.	Fatty Acids	

	13.	During photosynthesis, trees convert carbon dioxide and other materials to
a.	lipids.	c.	amino acids.	
b.	sugars.	d.	nucleic acids.	

	14.	Which of these best describes the process of chemosynthesis?
a.	Food is produced using energy from light	c.	Food is produced using energy from inorganic compound, such as hydrogen sulfide	
b.	DNA molecules are formed	d.	Cell membrane are constructed	

	15.	Which of the following is more efficient in producing ATP?
a.	Calvin Cycle	c.	Anaerobic Respiration	
b.	Aerobic Respiration	d.	Kreb’s Cycle	

	16.	Which of the following are the phases in photosynthesis?
a.	Kreb’s Cycle and Calvin Cycle	c.	ETC and Light dependent reactions	
b.	Light independent reactions and Calvin Cycle	d.	Light dependent reactions and Calvin Cycle	

	17.	Which of the following phases occurs regardless of whether it is anaerobic or aerobic respiration?
a.	Glycolysis	c.	ETC	
b.	Kreb’s Cycle	d.	Fermentation	

	18.	Deep sea bacteria live at ocean depths too great for light to reach. Which of these processes do these bacteria carry out to make their own food?
a.	Cellular Respiration	c.	Photosynthesis	
b.	Chemosynthesis	d.	Fermentation	

	19.	Which of the following shows how energy is transferred through the environment?
a.	Producer--> Carnivore-->Herbivore	c.	Producer--> Herbivore--> Carnivore	
b.	Carnivore--> Herbivore--> Producer	d.	Herbivore--> Producer-->Carnivore	

	20.	After glycolysis, there is no oxygen present.  What will happen next?
a.	Fermentation	c.	Photosynthesis	
b.	Kreb’s	d.	ETC	

BCR

	21.	How is carbon related to the flow of energy between the environment and organisms?
·	Name the carbon compound that is exchanged between plants and their environment.
·	Describe how plants use carbon from the atmosphere to create more complex molecules.
·	Describe how animals that eat plants change these molecules and return carbon to the atmosphere.

Bonus

	22.	A plant that receives the nutrition it needs will continue to live.  But what if we took all of its O2 away?  Do you think that the plant could still grow and why?

Exam 3
Answer Section

MULTIPLE CHOICE

	1.	ANS:	B	PTS:	1

	2.	ANS:	C	PTS:	1

	3.	ANS:	D	PTS:	1	DIF:	B	OBJ:	9-3
NAT:	C1 | C5 | G1	STA:	3.12.2.b

	4.	ANS:	B	PTS:	1	DIF:	B	OBJ:	9-3
NAT:	C1 | C5 | G1	STA:	3.12.2.b

	5.	ANS:	C	PTS:	1	DIF:	B	OBJ:	9-2
NAT:	C1 | C5	STA:	3.12.2.b | 3.12.2.c	

	6.	ANS:	B	PTS:	1

	7.	ANS:	A	PTS:	1

	8.	ANS:	D	PTS:	1

	9.	ANS:	A	PTS:	1

	10.	ANS:	C	PTS:	1

	11.	ANS:	C	PTS:	1	DIF:	B	OBJ:	9-3
NAT:	C1 | C5 | G1	STA:	3.12.2.b

	12.	ANS:	C	PTS:	1

	13.	ANS:	B	PTS:	1

	14.	ANS:	C	PTS:	1

	15.	ANS:	B	PTS:	1

	16.	ANS:	D	PTS:	1

	17.	ANS:	A	PTS:	1

	18.	ANS:	B	PTS:	1

	19.	ANS:	C	PTS:	1

	20.	ANS:	A	PTS:	1

ESSAY

	21.	ANS:	
BCR: Equations for photosynthesis and cellular respiration with explanations

PTS:	1

SHORT ANSWER

	22.	ANS:	
Required for cellular respiration, plants must get the E out of glucose once they make it.

PTS:	1