Biology 190 Chapter 10 Answers

Find a Local Tutor Today

We thoroughly check each answer to a question to provide you with the most correct answers. Found a mistake? Let us know about it through the REPORT button at the bottom of the page.

The light reactions of photosynthesis supply the Calvin cycle with
a. light energy
b. CO2 and ATP
c. H2O and NADPH
d. ATP and NADPH
e. sugar and O2
d. ATP and NADPH
Which of the following sequences correctly represents the flow of electrons during photosynthesis?
a. NADPH –> O2 –> CO2
b. H2O –> NADPH –> Calvin cycle
c. NADPH –> chlorophyll –> Calvin cycle
d. H2O –> photosystem I –> photosystem II
e. NADPH –> electron transport chain –> O2
b. H2O –> NADPH –> Calvin cycle
How is photosynthesis similar in C4 plants and CAM plants?
a. In both cases, only photosystem I is used.
b. Both types of plants make sugar without the Calvin cycle.
c. In both cases, rubisco is not fixed to carbon initially.
d. Both types of plants make most of their sugar in the dark.
e. In both cases, thylakoids are not involved in photosynthesis.
c. In both cases, rubisco is not fixed to carbon initially.
Which of the following statements is a correct distinction between autotrophs and heterotrophs?
a. Only heterotrophs require chemical compounds from the environment.
b. Cellular respiration is unique to heterotrophs.
c. Only heterotrophs have mitochondria.
d. Autotrophs, but not heterotrophs, can nourish themselves beginning with CO2 and other nutrients that are inorganic.
e. Only heterotrophs require oxygen.
d. Autotrophs, but not heterotrophs, can nourish themselves beginning with CO2 and other nutrients that are inorganic.
Which of the following does not occur during the Calvin cycle?
a. carbon fixation
b. oxidation of NADPH
c. release of oxygen
d.regeneration of the CO2 acceptor
e. comsumption of ATP
c. release of oxygen.
In mechanism, photophosphorylation is most similar to
a. substrate-level phosphorylation
b. oxidative phosphorylation in cellular respiration
c. the Calvin cycle
d. carbon fixation
e. reduction of NADP+
b. oxidatvie phosphorylation in cellular respiraton.
Which process is most directly driven by light energy?
a. creation of a pH gradient by pumping protons across the thylakoid membrane
b. carbon fixation in the stroma
c. reduction of NADP+ molecules
d. removal of electrons from chlorophyll molecules
e. ATP synthesis
d. removal of electrons from chlorophyll molecules.

Question Answer

The light reactions of photosynthesis supply the Calvin cycle with

CO2 and ATP.
H2O and NADPH.
sugar and O2.
ATP and NADPH.
light energy.

ATP and NADPH

Which of the following sequences correctly represents the flow of electrons during photosynthesis?

NADPH → electron transport chain → O2
NADPH → O2 → CO2
H2O → NADPH → Calvin cycle
NADPH → chlorophyll → Calvin cycle
H2O → photosystem I → photosystem II

H2O – NADPH- Calvin cycle

How is photosynthesis similar in C4 plants and CAM plants?

Both types of plants make most of their sugar in the dark.
In both cases, only photosystem I is used.
In both cases, thylakoids are not involved in photosynthesis.
Both types of plants make sugar without the Calvin cycle.
In both cases, rubisco is not used to fix carbon initially.

in both cases, rubisco is not used to fix carbon initially

Which of the following statements is a correct distinction between autotrophs and heterotrophs?

Only heterotrophs require oxygen.
Cellular respiration is unique to heterotrophs.
Autotrophs, but not heterotrophs, can nourish themselves beginning with CO2 and other nutrients that are inorganic.
Only heterotrophs require chemical compounds from the environment.
Only heterotrophs have mitochondria.

autotrophs, but not heterotrophs, can nourish themselves beginning with CO2 and other nutrients that are inorganic

Which of the following does not occur during the Calvin cycle?

consumption of ATP
carbon fixation
oxidation of NADPH
regeneration of the CO2 acceptor
release of oxygen

release of oxygen

In mechanism, photophosphorylation is most similar to

the Calvin cycle.
substrate-level phosphorylation in glycolysis.
carbon fixation.
reduction of NADP+.
oxidative phosphorylation in cellular respiration.

oxidative phosphorylation in cellular respiration

Which process is most directly driven by light energy?

ATP synthesis
carbon fixation in the stroma
reduction of NADP+ molecules
removal of electrons from chlorophyll molecules
creation of a pH gradient by pumping protons across the thylakoid membrane

removal of electrons from chlorophyll molecules

In photosynthesis, plants use carbon from __________ to make sugar and other organic molecules. (eText Overview)

water
carbon dioxide
chlorophyll
the sun
soil

carbon dioxide

Which of the following groups of organisms contains only heterotrophs? (eText Overview)

bacteria
protists
fungi
All of the listed responses are correct.
None of the listed responses are correct.

fungi

How does carbon dioxide enter the leaf? (eText Concept 10.1)

through the chloroplasts
through the roots
through the thylakoids
through the stomata
through the vascular system

through the stomata

In a rosebush, chlorophyll is located in __________. (eText Concept 10.1)

chloroplasts, which are in mesophyll cells in the thylakoids of a leaf
mesophyll cells, found within the thylakoids of a leaf’s chloroplasts
thylakoids, which are in mesophyll cells in the chloroplasts of a leaf
chloroplasts, which are in thylakoids in the mesophyll cells of a leaf
thylakoids, which are in chloroplasts in the mesophyll cells of a leaf

thylakoids, which are in the chloroplasts in the mesophyll cells of a leaf

Chlorophyll molecules are in which part of the chloroplast? (eText Concept 10.1)

thylakoid membranes
stroma
stomata
plasma membrane
thylakoid lumen

thylakoid membranes

The source of the oxygen produced by photosynthesis has been identified through experiments using radioactive tracers. The oxygen comes from __________. (eText Concept 10.1)

carbon dioxide
glucose
radioisotopes
water
light

water

In photosynthesis, what is the fate of the oxygen atoms present in CO2? They end up __________. (eText Concept 10.1)

as molecular oxygen
in sugar molecules
in water
as molecular oxygen and in sugar molecules
in sugar molecules and in water

in sugar molecules and in water

Open Hint for Question 8 in a new window Molecular oxygen is produced during __________. (eText Concept 10.1)

glycolysis
linear electron flow during the light reactions
the Calvin cycle
cyclic electron flow during the light reactions
re-energization of electrons by PSI

linear electron flow during the light reactions

Open Hint for Question 9 in a new window The reactions of the Calvin cycle are NOT directly dependent on light, but they usually do NOT occur at night. Why? (eText Concept 10.1)

It is often too cold at night for these reactions to take place.
Carbon dioxide concentrations decrease at night.
The Calvin cycle requires products only produced when the photosystems are illuminated.
Plants usually open their stomata at night.
At night, no water is available for the Calvin cycle.

the Calvin cycle requires products only produced when the photosystems are illuminated

The Calvin cycle occurs in the __________. (eText Concept 10.1)

thylakoid membrane
thylakoid lumen
stroma
stomata
matrix

stroma

What is the role of NADP+ in photosynthesis? (eText Concept 10.1)

It helps produce ATP from the light reactions.
It absorbs light energy.
It forms part of photosystem II.
It is the primary electron acceptor.
It forms NADPH to be used in the Calvin cycle.

it forms NADPH to be used in the calvin cycle

A photon of which of these colors would carry the most energy? (eText Concept 10.2)

green
yellow
blue
orange
red

blue

What is the range of wavelengths of light that are absorbed by the pigments in the thylakoid membranes? (eText Concept 10.2)

green, which is why plants are green
blue-violet and red-orange
the entire spectrum of white light
the infrared
the range absorbed by carotenoids

capture light energy

The most important role of pigments in photosynthesis is to __________. (eText Concept 10.2)

capture light energy
screen out harmful ultraviolet rays
store energy
catalyze the hydrolysis of water
catalyze the synthesis of ATP

blue-violet and red-orange

Based on the work of Engelmann, a plot of photosynthetic activity versus wavelength of light is referred to as __________. (eText Concept 10.2)

an effective spectrum
an absorption spectrum
an electromagnetic spectrum
a visible light spectrum
an action spectrum

action spectrum

When chloroplast pigments absorb light, __________. (eText Concept 10.2)

the pigments become reduced
the pigments lose potential energy
the pigments’ electrons become excited
the Calvin cycle is triggered
the pignments’ photons become excited

the pigments’ electrons become excited

What structure is formed by the reaction center, light-harvesting complexes, and primary electron acceptors that cluster, and is located in the thylakoid membrane? (eText Concept 10.2)

the fluorescence center
the photosystem
the electron transport chain
NADP+ reductase
ATP synthase

the photosystem

Where do the electrons entering photosystem II come from? (eText Concept 10.2)

chlorophyll molecules in the antenna complex
ATP
the electron transport chain
light
water

water

During photosynthesis in chloroplasts, O2 is produced from __________ via a series of reactions associated with __________. (eText Concept 10.2)

CO2 … photosystem II
H2O … photosystem II
CO2 … the Calvin cycle
H2O … photosystem I
CO2 … both photosystem I and the Calvin cycle

H2O … photosystem II

Which of the following is cycled in the cyclic variation of the light reactions? (eText Concept 10.2)

electrons
ATP
NADPH
ribulose bisphosphate
protons

electrons

Was this helpful?