BIO 438 Midterm 2 Exam Questions and Correct Answers
4 views 0 purchase
Module
BIO 438
Institution
BIO 438
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 ...
bio 438 midterm 2 exam questions and correct answe
anoxygenic phototrophs have light absorbing pigmen
assess the following statements and classify them
Written for
BIO 438
BIO 438
Seller
Follow
twishfrancis
Reviews received
Content preview
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
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller twishfrancis. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £7.99. You're not tied to anything after your purchase.
