Respuesta :
Answer:
4. The given statement is false.
Correct statement: The pyruvic acid produced in glycolysis enters the mitochondria if oxygen is present in a cell.
Explanation: Pyruvate is transported into the mitochondria with the help of pyruvate translocase (transport protein located in the membrane of the mitochondria) where it is decarboxylated in order to produce acetyl-CoA.
5. The given statement is false.
Correct statement: In the matrix, pyruvic acid is converted to acetyl-CoA before the Krebs cycle begins.
Explanation: In mitochondrial matrix, pyruvate is decarboxylated to produce acetyl-CoA which enters the Krebs cycle.
Pyruvate is converted into lactic acid in the cytoplasm when cell undergoes lactic acid fermentation due to lack of oxygen such as in muscle cell.
6. The given statement is true.
Acetyl-CoA condenses with oxaloacetate (4-carbon compound) to produce citrate (6-carbon compound).
7. The given statement is True.
CO₂ is released as the byproduct of cellular respiration which is removed out of the body.
Other products such as NADH, and FADH₂ are used in electron transport chain which aids in the production of ATP.
Aerobic cell respiration involves the Krebs cycle. It takes place in mitochondrial matrix producing NADH, and FADH₂ and releasing electrons. 4: FALSE (mitochondria)/ 5: FALSE (Acetil CoA)/ 6: TRUE/ 7: TRUE
-------------------------------------------------------------
Cellular respiration is the process by which cells degrade organic compounds and turn them into energy.
Aerobic respiration takes place in three steps or stages: Glycolysis, Krebs cycle and electron transporter chain.
- Glycolysis is the first step of cellular respiration. It occurs in the cytoplasm and its final product is Pyruvate.
- The Krebs cycle, also known as the citric acid cycle, or tricarboxylic acid cycle, takes place in the mitochondria matrix.
- Glycolysis and Krebs cycle produce electrons, which then travel along the electron transporter chain while releasing energy, and ATP is produced.
Pyruvate, the main product of glycolisis, enters the mitochondria matrix and turns into Acetyl CoA. Once in the matrix, it enters the Krebs cycle.
The resumed steps of the Krebs cycle are as follows,
1) Acetyl CoA joins an oxaloacetate molecule, which is a 4C molecule. They release the CoA group and form a 6C molecule called Citrate.
Acetil CoA + Oxalacetato → Citrato + CoA group
2) Citrate turns into an isomere Isocitrate
3) Isocitrate oxidates and release 1 CO₂ molecule, producing an α- ketoglutarate molecule -this is a 5C molecule-. Meanwhile, NAD+ reduces to NADH.
Isocitrate + NAD+ → α-cetoglutarate + CO₂ + NADH
4) α-ketoglutarate oxidates and release 1 CO₂ molecule, producing a 4C molecule, which joins a Coenzyme A producing Succinyl-CoA. Meanwhile, NAD+ reduces to NADH.
α-cetoglutarate + NAD+ → 4C molecule + CO₂ + NADH
4C molecule + Coenzyme A → Succinil-CoA
5) CoA from Succinyl-CoA is substituted with a phosphate group, which then forms ATP. The final product is Succinate and ATP
Succinyl-CoA + Phosphate group + ADP → Succinate + ATP + CoA
6) Succinate oxidizes and forms Fumarate, a 4C molecule. FAD+ forms FAH₂
Succinate + FAD+ → Fumarate + FADH₂
7) A water molecule and Fumarate produce Malate, which is another 4C molecule
Fumarate + H₂O → Malate
8) Finally, malate oxidizes and oxalacetate regenerates -the initial 4C compound-. NAD+ reduces to NADH.
Malato + NAD+ → Oxalacetate + NADH
STATEMENTS:
4. The pyruvic acid produced in glycolysis enters the chloroplasts if oxygen is present in a cell. FALSE
Correct statement:
The pyruvic acid produced in glycolysis enters the mitochondria if oxygen is present in a cell.
After glycolysis, he whole cellular respiration process occurs in the mitochondria, once the piruvate enters the matrix.
5. In the matrix, pyruvic acid is converted to lactic acid before the Krebs cycle begins. FALSE.
Correct statement:
5. In the matrix, pyruvic acid is converted to Acetil CoA before the Krebs cycle begins.
When the pyruvate is transported to the mitochondrial matrix, it is decarboxylated and converted into Acetil CoA.
6. The compound that joins with a 4-carbon molecule in the Krebs cycle is called acetyl-CoA. TRUE
The 4-C molecule that joins Acetyl CoA is Oxalacetate. Together they form Cytrate, a 6-C molecule.
7. Carbon dioxide is the only product of the Krebs cycle that is not re- used or used in other stages of cellular respiration. TRUE.
Released electrons, NADH, and FADH₂ are used in the electron transporter chain, which will produce ATP.
--------------------------------
Related link: https://brainly.com/question/13153590?referrer=searchResults
