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BIO 438 Midterm 2 Exam Questions and Correct Answers
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Anoxygenic phototrophs have light-absorbing pigments called _________; in some bacteria, these are located in membranous vesicles called _________. bacteriochlorophylls; chlorosomes Assess the following statements and classify them according to whether they refer to the light reaction or the dark ...

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  • September 13, 2024
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  • 2024/2025
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  • bio 438 midterm 2 exam questions and correct answe
  • anoxygenic phototrophs have light absorbing pigmen
  • assess the following statements and classify them

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BIO 438 Midterm 2 Exam Questions and
Correct Answers
Anoxygenic phototrophs have light-absorbing pigments called _________; in some
bacteria, these are located in membranous vesicles called _________.
✅bacteriochlorophylls; chlorosomes

Assess the following statements and classify them according to whether they refer to
the light reaction or the dark reaction of photosynthesis.

Light reaction

Dark reaction ✅Light reaction: ATP is produced by photophosphorylation, an ETC is
utilized, NADPH is generated, and a proton motive force is created

Dark reaction: ATP is hydrolyzed, CO2 is fixed, and NADPH is oxidized

In addition to its role in ATP synthesis, in bacteria the PMF provides energy to drive
__________. ✅flagellar rotation and nutrient uptake

Label the diagram below showing the process of oxygenic photosynthesis. ✅Image 1

Oxidative phosphorylation is powered by a proton motive force generated from the
electron transport chain, whereas __________ by chlorophyll-based phototrophs is
driven by the capture of light photons. ✅photophosphorylation

explanation: Oxidative phosphorylation and photophosphorylation by chlorophyll-based
phototrophs differ primarily in the energy source driving the process.

In reverse electron flow, ATP hydrolysis provides the energy to convert NADH to NAD+.
✅False

explanation: In reverse electron flow, ATP hydrolysis provides the energy to convert
NAD+ to NADH.

Photosynthesis is divided into two parts; in the first part, __________ energy is trapped
and converted to chemical energy and reducing power. ✅light

explanation: In photosynthesis light energy is captured and converted to chemical
energy.

, Photosynthetic eukaryotes and cyanobacteria carry out _________ photosynthesis, so
named because oxygen is generated and released into the environment when light
energy is converted to chemical energy. ✅oxygenic

explanation: Oxygen is released when photosynthetic eukaryotes and cyanobacteria
carry out photosynthesis.

The term phototrophy refers to the use of light energy to fuel a variety of cellular
activities but not necessarily _________ _________ fixation. ✅carbon dioxide

explanation: Phototrophs may or may not fix carbon dioxide, depending on whether they
perform photosynthesis.

Light energy is converted to chemical energy via _________. ✅photophosphorylation

explanation: Oxidative phosphorylation and photophosphorylation by chlorophyll-based
phototrophs differ primarily in the energy source driving the process.

Evaluate the statements below and choose those that correctly reflect the importance of
chlorophyll-based phototrophy. ✅Solar-energy is converted to chemical energy in the
form of ATP, oxygen is a byproduct which replenishes the supply in Earth's atmosphere,
and NADPH is generated providing reducing power for cellular processes.

Photosynthesis is one of the most significant metabolic processes on Earth because
almost all our energy is ultimately derived from _________. ✅solar energy

explanation: Solar energy is the ultimate source of almost all energy on Earth.

Following the first stage of photosynthesis, the chemical energy and reducing power
that is produced is then used to fix carbon dioxide and synthesize cell constituents in
the _________ reactions. ✅dark

explanation: The dark reactions are fueled by the chemical energy and reducing power
that is produced in the light reactions.

When the photosystem I antenna transfers light energy to P700, P700 absorbs the
energy and is changed into an excited state with a very negative reduction potential.
This process is called ________ photophosphorylation because electrons travel in a
circle and ATP is formed. ✅cyclic

explanation: In cyclic photophosphorylation electrons travel in a circle and ATP is
formed.

Many differences found in anoxygenic phototrophs are because they have a single
_________, restricting them to cyclic photophosphorylation. ✅photosystem

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