Biology Questions and Answers
coenzyme A) with liberation of one
carbon dioxide. The Krebs cycle (alsoknown as citric acid cycle), the second (^)
stage of aerobic respiration, then
begins.
- What is the official name
of pyruvic acid?
Pyruvic acid is 2-oxthus a molecule maopropanoic acid. It isde of three linearly
bound carbons with one extremity
forming the organic acid f(COOH) and the middle carbon unctionbinding (^)
to an oxygen atom by double bond.
- Why can it be said that
each glucose molecule runs
the Krebs cycle twice?
Each glucose molecule “cycles” the
Krebs cycle twice beglycolysis each used glucose hascause after (^)
generated two pyruvic acid molecules
and each pyruvic acid is conv1:1 proportion into acetyl CoA. Eacherted in a
acetyl CoA then cycles the Krebs cycle
once.
- Why is the Krebs cycle
also called the final common
pathway of the degradation of
organic compounds?
The Krebs cycle is called the final
commoorganic comn pathwaypounds because of the degradation oit is also f
possible to generate acetyl CoA from
the degradation of lipids and proteins.
Since acetyl CoA is the substrate that
triggers thcalled the final comme Krebs cycle, this pron pathway foocess isr
being activated by other organic
molecules (lipionly by glucose.ds and proteins) and not
The organismfat and proteins to cycle th uses energetic reserves ofe Krebs cycle
when undergoing malnutrition or when
there is no glucose cells. available for the- What are the final
energetic products of each
round of the Krebs cycle?
Where is most part of the utile
energy at the end of Krebs
cycle found?
After each round of the Krebs cycle two
carbon dioxide molecules, ei(hydrogen ions) captured by NAD aght protonsnd
FAD (a hydrogen acceptor too) and one
ATP molecule are produced.
During the Krebs cycle acetyl CoA is
degraded. At the end the utile incorporated into hydrogens transenergy isported (^)
by FADH 2 and NADH 2 molecules.
- How many carbon dioxide
molecules are liberated after
each cycle of the Krebs cycle?
For a single glucose how many
carbon dioxide molecules
were already liberated by the
aerobic respiration at that
point?
http://www.biology-questions-and-answers.com