AnswersAISD-Biology A CR - 25-26Photosynthesis and Cellular Respiration

Photosynthesis and Cellular Respiration — Unit test Answers

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1
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Which phrase describes one main feature of the atmosphere?

p
protects Earth’s surface
i
includes organisms in the air, on land, and in water
c
consists of rocks, minerals, landforms, and Earth’s interior
c
comprises oceans, lakes, rivers, streams, and groundwater
2
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How are mitochondria similar to chloroplasts?

A
Both have many layers of membranes.
B
Both contain molecules of chlorophyll.
C
Both are found in the cells of consumers.
D
Both are needed for cells to store energy.
3

How does a catalyst influence a chemical reaction?

A
It speeds up or slows down a chemical reaction by direct participation.
B
It reacts with products to increase the concentration of reactants.
C
It decreases the amount of energy necessary for the reaction to proceed.
D
It increases the total amount of products formed.
4

Which important event in Earth’s history occurred during the Jurassic period?

T
The first birds emerged on Earth.
M
Mammals were in search of food.
A
Animals with shells emerged on Earth
T
Treelike ferns first began to grow and populate.
5

The brothers pictured below are identical twins.The boys in this picture look alike because their bodies contain identical

Question illustration
A
carbohydrates.
B
lipids.
C
nucleic acids.
D
proteins.
6

Recall that photosynthesis consists of two sets of chemical reactions. Which of these describes the energy conversions that occur during the light-independent reactions?

A
light energy à chemical energy
B
chemical energy à chemical energy
C
chemical energy à mechanical energy
D
mechanical energy à mechanical energy
7

The chemical equation below summarizes the process of photosynthesis.6CO2 + 6H2O + energy à 6O2 + C6H12O6Where is the energy shown in the equation transferred as a result of photosynthesis?

A
into water
B
into the air
C
into sugars
D
into the ground
8

Which is an energy conversion that occurs during cellular respiration?

A
ADP à ATP
B
FADH2 à FAD
C
pyruvate à glucose
D
light energy à chemical energy
9

What determines the length of a geologic time period?

A
fossil record
B
material density
C
meteors and rocks
D
radioactive materials
10

Which statement describes how enzymes and substrates are related?

A
The enzyme influences the speed of change from substrate to product.
B
Enzymes are released as substrates in a chemical reaction.
C
An enzyme is a special kind of substrate in a chemical reaction.
D
Substrates combine with enzymes to form reactants.
11

Which reaction is exothermic?

A
a reaction that absorbs energy from the environment
B
a reaction that requires an activation energy
C
a reaction that releases energy into the environment
D
a reaction that does not involve a change in energy
12

Which statement describes one way that RNA differs from DNA?

A
One is a protein, and the other is a nucleic acid.
B
They contain different five-carbon sugars and a different nitrogenous base.
C
They are both carbohydrates, but one is a polysaccharide.
D
One provides energy, and the other carries genetic information.
13

Which best explains how scientists confirmed that the moon formed around the same time as Earth?

A
Scientists determined the approximate age of fossils from the moon and Earth.
B
Scientists used radioactive dating to study the age of material from the moon and Earth.
C
Scientists explored the cycle of condensation and evaporation over time on the moon and Earth.
D
Scientists analyzed the content of gases that were part of the atmospheres on the moon and Earth.
14

Which component is affected when a catalyst is added to a chemical reaction?

A
the amount of substrate
B
the activation energy
C
the amount of product
D
the concentration of reactants
15

Which period belongs to the Paleozoic era and not the Cenozoic era?

A
Devonian
B
Neogene
C
Paleogene
D
Quaternary

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