BIO 124: Chapter 26 2025/2026 Exam
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What do some photosynthetic bacteria use as a source of electrons instead
of water? - 🧠ANSWER ✔✔hydrogen sulfide (H2S)
What are organisms called that use inorganic compounds as electron
donors in cellular respiration? - 🧠ANSWER ✔✔lithotrophs
Unlike plant cell walls that contain cellulose, bacterial cell walls are
composed of ________. - 🧠ANSWER ✔✔peptidoglycan
When using Koch's postulates, which of the following is an essential
requirement for the suspected pathogen? - 🧠ANSWER ✔✔It is present in
all organisms with the disease
What has metagenomic analysis allowed researchers to do for the first
time? - 🧠ANSWER ✔✔study organisms that cannot be cultured (grown in
the lab)
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
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, Biologists often use the term "energy source" as a synonym for "electron
donor." Why? - 🧠ANSWER ✔✔An electron donor provides the potential
energy required to produce ATP.
The text claims that the evolution of an oxygen-rich atmosphere paved the
way for increasingly efficient cellular respiration and higher growth rates in
organisms. Explain. - 🧠ANSWER ✔✔Large amounts of potential energy are
released and ATP produced when oxygen is the electron acceptor,
because oxygen is so electronegative. Large body size and high growth
rates are not possible without large amounts of ATP.
The researchers who observed that magnetite was produced by bacterial
cultures from the deep subsurface carried out a follow-up experiment.
These biologists treated some of the cultures with a drug that poisons the
enzymes involved in electron transport chains. In cultures where the drug
was present, no more magnetite was produced. Does this result support or
undermine their hypothesis that the bacteria in the cultures perform cellular
respiration? Explain your reasoning. - 🧠ANSWER ✔✔This result supports
their hypothesis because the drug poisons the enzymes of the electron
transport chain and prevents electron transfer to Fe3-, which is required to
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
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Questions and Answers 100%
Guaranteed Success | Already Rated A+
What do some photosynthetic bacteria use as a source of electrons instead
of water? - 🧠ANSWER ✔✔hydrogen sulfide (H2S)
What are organisms called that use inorganic compounds as electron
donors in cellular respiration? - 🧠ANSWER ✔✔lithotrophs
Unlike plant cell walls that contain cellulose, bacterial cell walls are
composed of ________. - 🧠ANSWER ✔✔peptidoglycan
When using Koch's postulates, which of the following is an essential
requirement for the suspected pathogen? - 🧠ANSWER ✔✔It is present in
all organisms with the disease
What has metagenomic analysis allowed researchers to do for the first
time? - 🧠ANSWER ✔✔study organisms that cannot be cultured (grown in
the lab)
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
1
, Biologists often use the term "energy source" as a synonym for "electron
donor." Why? - 🧠ANSWER ✔✔An electron donor provides the potential
energy required to produce ATP.
The text claims that the evolution of an oxygen-rich atmosphere paved the
way for increasingly efficient cellular respiration and higher growth rates in
organisms. Explain. - 🧠ANSWER ✔✔Large amounts of potential energy are
released and ATP produced when oxygen is the electron acceptor,
because oxygen is so electronegative. Large body size and high growth
rates are not possible without large amounts of ATP.
The researchers who observed that magnetite was produced by bacterial
cultures from the deep subsurface carried out a follow-up experiment.
These biologists treated some of the cultures with a drug that poisons the
enzymes involved in electron transport chains. In cultures where the drug
was present, no more magnetite was produced. Does this result support or
undermine their hypothesis that the bacteria in the cultures perform cellular
respiration? Explain your reasoning. - 🧠ANSWER ✔✔This result supports
their hypothesis because the drug poisons the enzymes of the electron
transport chain and prevents electron transfer to Fe3-, which is required to
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
2
