Physiology and Biochemistry of Respiration Flashcards
True or False
Most of the energy required by horticultural produce is supplied by aerobic respiration.
True.
It is the reverse of photosynthesis.
Respiration
What are the 4 processes involved in aerobic respiration?
Conversion of CHO
Glycolysis
TCA cycle
Electron Transport Chain
It is the conversion of carbohydrate to six-carbon sugar phosphates of glucose or fructose by addition of inorganic phosphate
Conversion of CHO
What is the true initial substrates for respiration via glycoylysis?
Hexose phosphate
True or False
The process of converting one glucose molecule to two molecules of pyruvate is a total energy captured in 9 ATP molecules.
False.
8 ATP molecules
Where does glycolysis occur?
Cytoplasm
It is the process of splitting the hexose phosphate into two molecules of 3-C pyruvate.
Glycolysis
What is the 3-C pyruvate converted to during glycolysis?
2-C Acetyl-coenzyme A
This process is also known as the citric acid or Krebs cycle.
TCA cycle
Where does TCA cycle occur?
Mitochondria
What does TCA cycle oxidize?
Oxidizes acteyl-CoA to CO2 and H20
How many ATP molecules are produced from the TCA cycle, in addition to the 8 ATP molecules from glycolysis?
30 ATPs
What is the process that occurs in the inner membranes of the mitochondria and is a series of dehydrogenase enzymes, cytochrome proteins, and ubiquinones that transfer electrons from NADH and FADH2, synthesizing ATP and regenerating oxidized forms of NAD and FAD for reuse in respiratory reactions?
ETC/ electron transport chain
What enables the rate of aerobic respiration to be measured physiologically in plant tissues?
Production of CO2 and uptake of O2
What is the energy currency of cells
ATP
True or False
The oxidative phosphorylation reaction is displayed below:
ATP -> ADP + Pi + energy
True
What is the major reason for the need to refrigerate produce during prolonged storage?
heat generated during respiration
True or False
Ethylene spikes up during ripening stage.
True.
It also goes down after.
It is a useful guide to potential storage life of produce.
Respiration rate
True or False
Respiration rate goes down when produce is already ageing.
True
Respiration rate is highest in what development stage, matured or immature?
Immature
True or False.
Climacteric fruits experience pronounce increase in respiration during maturation.
False.
During ripening.
When does the respiratory climacteric commence?
When fruit reached its maximum fruit size
What fruit only ripens when detached from plant?
AVOCADO
Can respiratory climacteric continue when fruits is detached from plant?
YES, as well as ripening process.
Are strawberries and pineapple, climacteric?
No. Citrus fruits are nonclimacteric.
Are vegetables climacteric?
No. Since they don’t ripen further.
