AP Biology : AP Biology
Study concepts, example questions & explanations for AP Biology
All AP Biology Resources
Example Questions
Example Question #2 : Understand Light Dependent Reactions
What products of the light dependent reaction are necessary for the light independent reaction to occur?
ADP and NADP+
ATP and NADP+
ADP and NADP+
ATP and NAPH
ATP and NAPH
ATP and NADPH are produced during the light dependent reaction, and are reactants necessary for the light independent reaction (Calvin Cycle) to occur. During the light independent reaction, ATP and NADPH are used to convert phosphoglycerate molecules (PGA) to glyceraldehyde-3-phosphate molecules (G3P). G3P is then used to produce glucose.
Example Question #6 : Understand Light Dependent Reactions
Which is true of light dependent reactions?
GTP is a reactant
ATP is a product
NADP+ is a product
ATP is a product
Light dependent reactions convert solar energy to chemical energy (in the form of ATP and NADPH). Sunlight and H2O are the reactant of the light dependent reaction. The sunlight is captured by photosystem II, and is used to excite electrons. Splitting of H2O produces hydrogen ions used to establish the proton gradient, and electrons produced replace the electrons transferred to the primary electron acceptor.
Example Question #2231 : Ap Biology
Where is the electron transport chain located, for the light dependent reaction?
thylakoid lumen
stroma
thylakoid membrane
mitochondrial membrane
thylakoid membrane
The electron transport chain is located on the thylakoid membrane. The proton gradient is established through pumping hydrogen ions into the interior of the thylakoid (lumen).
Example Question #1 : Understand Inputs And Outputs, Purpose
Which of the following is not a reactant used in the process of photosynthesis?
Light energy
O2
CO2
H2O
O2
The process of photosynthesis can be summarized by the following equation.
H2O, CO2, and light energy are thus reactants of photosynthesis, while O2 is only a product.
Example Question #2 : Understand Inputs And Outputs, Purpose
What are the products of photosynthesis?
Light and glucose
Oxygen and carbon dioxide
Water and carbon dioxide
Carbon dioxide and light
Glucose and oxygen
Glucose and oxygen
The photosynthesis equation can be written as:
From this equation, we can see that plants take in carbon dioxide, water, and light energy as reactants and produce glucose and oxygen as products.
Example Question #2 : Understand Inputs And Outputs, Purpose
Some organisms, such as green plants, are capable of obtaining energy directly from photosynthesis. These organisms are termed __________.
herbivores
heterotrophs
homotrophs
autotrophs
primary consumers
autotrophs
Autotrophs are organisms that produce complex organic compounds from substances present in the surroundings. These organisms may do this through the use of energy from light or from inorganic chemical reactions.
In contrast, heterotrophs require organic input in order to generate biological compounds and are unable to use light or inorganic materials for energy.
Example Question #3 : Understand Inputs And Outputs, Purpose
Which of the following is true of photosynthesis?
Carbon dioxide is reduced
Carbon dioxide is oxidized
Water is reduced
The process requires no energy
Electrons decrease in potential energy as they move from water to sugar
Carbon dioxide is reduced
Photosynthesis occurs in the chloroplasts of plant cells, where carbon dioxide is reduced and water is oxidized to create sugar. During this process electrons demonstrate increased potential energy as they move from water to sugar. The process requires an initial energy input, derived from photons.
Example Question #4 : Understand Inputs And Outputs, Purpose
Organisms that make their organic molecules from inorganic raw materials obtained from the surrounding environment are called __________.
auxotrophs
plants
autotrophs
heterotrophs
autotrophs
Autotrophs create organic material from inorganic materials. Autotrophs are self-feeders in that they do not consume other organic materials but rather create their own organic materials. Plants and other photosynthetic organisms are examples of autotrophs.
Example Question #5 : Understand Inputs And Outputs, Purpose
Plants are an example of which of the following categories of organisms?
Biosphere consumers
Autotrophs
Chemoautotrophs
Heterotrophs
Autotrophs
Plants are an example of autotrophs. Autotrophs sustain themselves without consuming other organic material. Instead they create organic material from inorganic materials.
Example Question #6 : Understand Inputs And Outputs, Purpose
Which of the following are referred to as the major sites of photosynthesis in most plants?
Flowers
Stems
Leaves
Roots
Leaves
The leaves are the major sites of photosynthesis in most plants. The chloroplasts are located in the mesophyll—interior tissues of the leaves—and are the primary sites of photosynthesis.
Certified Tutor
Certified Tutor
All AP Biology Resources
