The krebs cycle for questions 4–7, write true if the statement is true. if the statement

The krebs cycle for questions 4–7, write true if the statement is true. if the statement is false, change the underlined word or words to make the statement true. 4. the pyruvic acid produced in glycolysis enters the chloroplasts if oxygen is present in a cell. 5. in the matrix, pyruvic acid is converted to lactic acid before the krebs cycle begins. 6. the compound that joins with a 4-carbon molecule in the krebs cycle is called acetyl-coa. 7. carbon dioxide is the only product of the krebs cycle that is not re- used or used in other stages of cellular respiration.

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  1. D. ethyl alcohol fermentation and the Krebs cycle

    Fermentation is a process from which we can make ethanol. Fruits, grains tubers have been fermented to alcoholic beverages for ages. The process depends upon microorganisms called yeasts which produce enzymes that catalyze the conversion of glucose to ethanol and carbon dioxide  

    Yeast is used to breakdown complex carbohydrates to simple sugars. Biochemical process where glucose is converted to ethanol and carbon dioxide by the reaction of enzymes produced by yeast

    The kerbs cycle which is also known as the citric acid cycle. The process takes place in the living cells within the mitochondria and consumes oxygen whilst producing carbon dioxide as a waste product

  2. A. The Krebs Cycle produces electron carriers for the electron transport chain is the correct answer 100%

  3. 1. B. NADH

    2. B. hydrolysis of ATP.

    3. C. ATP is produced from protein.

    4. Option C.

    5. Option C. Oxygen

    6. Option D. Glucose.

    7. Carbondioxide.

    8. Metabolism.

    9. Electron carriers.

    10. Electrons.

    Explanation:

    Cellular respiration is a series of metabolic processes that break down sugars or food to produce energy. ATP is the cellular energy produced during cellular respiration. Cellular respiration requires oxygen which is also called aerobic respiration. There are stages of cellular respiration and they include; glycolysis, pyruvate oxidation, Krebs cycle or citric acid and oxidative phosphorylation. During cellular respiration, glucose is broken down into carbondioxide and water. Along the way, ATP is produced from the processes that transform glucose.

  4. 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.

  5. 4 When ADP adds another phosphate, it becomes . ATP AMP ABP none of the above

    ADP = adenosine diphosphate
    ATP = adenosine triphosphate

    so when another phosphate is added to ADP, it becomes ATP.

    In fact, during the actual conversion, the product is ATP and AMP.  ATP has one more phosphate, AMP has one less.

  6. NADH, FADH2, and ATP or GTP.

    Explanation:

    Citric acid cycle refers to the different chemical reactions that is engaged by all aerobic organisms in order to release the energy stored through the oxidation of acetyl-CoA that is gotten from proteins, fats and carbohydrates, into adenosine triphosphate (ATP)and carbon dioxide (CO2). It is also called TCA cycle or the Krebs cycle.

    The first step of citric acid cycle starts with the fusion of acetyl-CoA and oxaloacetate to produce citric acid. And the products of the citric acid cycle for each acetyl-CoA molecule contains these products;

    1.) carbon dioxide molecules

    2.)Three NADH molecules

    3.) One FADH2 molecule, and one GTP/ATP molecule.

    Therefore, for every When a glucose molecule to produce two acetyl-CoA molecules, there will be production of 4 carbon dioxide molecules(CO2) , 6 NADH molecules, 2FADH2 molecules, and 2 GTP/ATP molecules by the cytric acid cycle. There is also regeneration of oxaloacetate by the cytric cycle.

    The citric acid cycle is cycled twice for all glucose molecules that goes through respiration.and for each glucose, there is production of two acetyl-CoA molecules

  7. Ans.1. (A). 34 ATP.

    Electron transport chain is defined as a series of reactions that involves transfer of electrons from one molecule to another via redox reactions and transfer of protons across the mitochondrial membrane. The transfer of protons make a proton gradient that drives energy for ATP synthesis.

    Thus, the correct answer is option (A).  

    Ans.2. False.

    Cellular respiration is a metabolic reaction that involves breakdown of complex organic molecules, such as glucose to provide energy in the form of ATP molecules. Glucose is consumed in cellular respiration, instead of being produced.

    Thus, the given statement is 'false.'

    Ans.3. (C) glycolysis, Krebs cycle (citric acid cycle), Electron transport chain

    Cellular respiration takes place in three steps, which include glycolysis, Krebs cycle (citric acid cycle), and electron transport chain. During glycolysis, glucose molecule converts into pyruvate that enters into Krebs cycle as acetyl co-enzyme A. During Krebs cycle, NADH and FADH2 are produced that enter electron transport chain to make ATP molecules.

    Thus, the correct answer is option (C).

    Ans.4. (A)  Pyruvate.

    Glycolysis is defined as first step of cellular respiration that involves breakdown of glucose molecules to make energy releasing molecules, ATPs. Each glucose molecule produces two molecules of pyruvate as end products.

    Thus, the correct answer is option (A).

    Ans.5. (B) CO2.

    Krebs cycle includes a series of reactions that helps to generate energy by forming NADH and FADH2 molecules. During krebs cycle, one molecule of acetyl co-enzyme A gets oxidized to produce 6 NADH and 2 FADH2 molecules and produce water and two carbon dioxide molecules.

    Thus, the correct answer is option (B).

  8. explanation:

    b,bacteria convert nitrates

    into nitrogen gas.

    d,plants and animals take in

    and use nitrogen compounds.

    e,bacteria break down waste    

    products and return nitrogen  

    to the soil.

    a,bacteria convert atmospheric

    nitrogen to ammonia.

    c,bacteria convert ammonia

    to nitrites and nitrates.

    [tex]Match each step in the nitrogen cycle to its description[/tex]

  9. Each acetyl co-enzyme A proceeded once through the citric acid cycle. Therefore, in total, it created 6 NADU + H+ molecules, two FADDISH molecules, four carbon dioxide molecules, and two ATP molecules.

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