Photosynthesis

Topics: Photosynthesis, Adenosine triphosphate, Chloroplast Pages: 5 (731 words) Published: January 12, 2014
Name Skyler Fortescue Class Blue Date January 6, 2014

8.1 Energy and Life
Chemical Energy and ATP
For Questions 1–6, complete each statement by writing the correct word or words.

1. energy is the ability to do work.

2. The main chemical compound cells use for energy is Adenosine triphosphate (ATP)

3. Ribose is a 5-carbon sugar molecule that is part of an ATP molecule.

4. The phosphate groups of ATP are the key to its ability to store and supply energy. 5. ATP releases energy when it breaks bonds between its phosphate groups. 6. Most cells only store enough ATP for short amounts of activity.

7. Label each part of the diagram of an ATP molecule below.

Adenine Ribose three phosphates

8. Energy is needed to add a third phosphate group to ADP to make ATP. What is a cell’s source of this energy?
They get this energy from food.

Heterotrophs and Autotrophs
For Questions 9-13, write True if the statement is true. If the statement is false, change the underlined word or words to make the statement true.

True9.All heterotrophs must eat food to get energy.

True10.Autotrophs do not need to eat food because they make food.

False sunlight11.The energy in food originally came from ATP.

False pulling together12.The term photosynthesis means “pulling apart with light” in Greek.

True__13.The energy of sunlight is stored in the chemical bonds of carbohydrates.

14.Complete the table comparing two types of organisms.

Autotrophs and Heterotrophs
Type
Description
Examples
Autotrophs
An organism that is able to create its own food through photosynthesis (simple organic substances) Plants
Heterotrophs
An organism that “feeds” by absorbing complex organic substances. Animals/humans

8.2 Photosynthesis: An Overview
Chlorophyll and Chloroplasts
For Questions 1–6, complete each statement by writing the correct word or words.

1. The chlorophyll of light determines its color.

2. Chemicals that absorb light are called pigments.

3. Chlorophyll makes plants look green because it reflects green light.

4. Chloroplasts contain an abundance of saclike photosynthetic membranes called Thylakoid.

5. The Stroma is the fluid portion of the chloroplast located outside the thylakoids.

6. The visible light absorbed by chlorophyll raises the energy level of the chlorophyll’s electrons.

7. Label the internal parts of the chloroplast below.

Stroma
LumenThylakoid

High-Energy Electrons
8. Where do the high-energy electrons carried by NADPH come from? Photosystem I

An Overview of Photosynthesis
For Questions 9–11, write the letter of the correct answer on the line at the left.

B 9. What are the reactants of the photosynthesis reaction? A. chlorophyll and light C. carbohydrates and oxygen
B. carbon dioxide and water D. high-energy electrons and air C 10. What are the products of the light-dependent reactions? A. chloroplasts and light C. oxygen and ATP
B. proteins and lipids D. water and sugars
A 11. Where do the light-independent reactions occur?
A. stroma C. chlorophyll
B. thylakoids D. mitochondria

14. Complete the illustration by writing the reactants and products of the light-dependent and light-independent reactions. Also, fill in the energy source that excites the electrons.

8.3 The Process of Photosynthesis
The Light-Dependent Reactions: Generating ATP and NADPH
For Questions 1–5, write True if the statement is true. If the statement is false, change the underlined word or words to make the statement true.

True 1. Photosystems are clusters of chlorophyll and proteins.

Photosystem II 2. The light-dependent reactions begin when photosystem I absorbs light.

True 3. Electrons from water molecules replace the ones lost by photosystem II.

NADPH 4. ATP is the product of...
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