Respiration In Plants Flashcards
Term respiration was given by
Dutrochet.
Respiration is 1️⃣Exergonic cellular process 2️⃣Amphibolic process 3️⃣Multi step enzymatic process 4️⃣All of these
All of these.
What is floating respiration?
When respiratory substrates are stored carbohydrates (like glycogen, starch, sucrose, hexose or fats or proteins).
What is protoplasmic respiration?
When proteins(structural or enzymatic ) are oxidized. * it is the respiration of starved cells.
Oxidation of proteins in legumes is
1️⃣Floating respiration
2️⃣Protoplasmic respiration
Floating respiration.
# Usually when proteins are oxidised it’s called protoplasmic respiration.but when stored carbohydrates which include proteins are used its called floating respiration.
So, exceptionally, in legumes also STORED PROTEINS are oxidized therefore floating respiration.Floating respiration occurs in
When;
Mustard respire by stored oils.
Cereals by proteins.
Protoplasmic respiration occurs in
When;
Mustard respire through proteins .
Cereals by lipids.
Most commonly used substrate is
Glucose.
Glycolysis occurs in
Cytoplasm (or cytosol)
Glycolysis is known as EMP pathway. Why?
Scheme of glycolysis was given by 3 scientists;
Embden, Mayerhof & Parnas =EMP
Glycolysis consists of 10 rxns. Name these in order.
- Phosphorylation of glucose
- Isomerisation
- Phosphorylation of fructose-6-phosphate
- Splitting
- Isomerisation
- Oxidative phosphorylation
- Substrate level phosphorylation
- Isomerisation
- 9th step=enolase wala step
- Substrate level phosphorylation
Preparatory phase includes first ____ reactions.
First 4 rxns upto splitting one.
What’s oxidative phosphorylation?
Glyceraldehyde-3-phosphate is oxidised through the removal of hydrogen & addition of phosphate from inorganic source I.e H3PO4 in presence of glyceraldehyde-3-phosphate dehydrogenase.
This step is k/a oxidative phosphorylation.
Enolase is inhibited by _________.
Fluoride.
Oxidative phosphorylation can be inhibited by
Iodoacetate.
In glycolysis reaction___,___,___&___ are reversible.
1,3,7,10.
__________is considered the connecting link between glycolysis & kreb’s cycle.
Acetyl-co-A
Write link rxn or gateway rxn or oxidative decarboxylation of pyruvic acid.
Pyruvic acid, a 3 carbon compound, gets converted into Acetylene-co-A, a 2 carbon compound + CO2 in presence of co enzymes(Mg2+,lipoic acid,tpp, pyruvate dehydrogenase complex).During this NAD+ ——> NADH + H+
What’s Kreb’s cycle?
Sequential or step wise oxidative and cyclic degradation of activated acetate is called Krebs cycle.(aka metabolic sink)
Name complexes involved in ETS.
Complex 1:NADH-Dehydrogenase or Nadh-UQ Reductase
Complex 2: succinate dehydrogenase or Fadh2 dehydrogenase.
Complex 3: cytochrome reductase or cytochrome bc1
Complex 4: cytochrome oxidase or cytochrome aa3
* Complex 5: ATP synthase or fo-f1 particles.
*if ETS + ATP synthesis is considered.
____ is the final electron/hydrogen acceptor in ETS.
O2.
Name mobile carriers involved in ETS.
▪️Ubiquinone or Co-UQ
▪️Cyt. C
Respiratory coefficient of tripalmitin ( a fat) is :
0.7
R.Q= 102 co2 / 145 o2 = 0.7 [NCERT]
Respiratory coefficient of carbohydrates is
1
R.Q = 6 co2 / 6 o2 = 1
Respiratory coefficient of fats and proteins is
Less than 1.
Bcz fats need more o2 for oxidation
For proteins it’s usually 0.9
Respiratory coefficient of oxalic acid and malic acid is resp.:
1) 1, 0.9
2) 0.9, 1
3) 4, 1.33
4) 1.33, 4
3) oxalic acid = 4 and for malic acid = 1.33
