Hi, Please answer the following questions What is the source of the carbon (wher

Question

Hi,

Please answer the following questions

What is the source of the carbon (where does it come from) atoms in the Calvin Cycle of photosynthesis? Select one: a. Splitting of water b. Glucose c. Phosphoglyceraldehyde d. Atmospheric carbon dioxide e. ATP What is the source of the oxygen (O2) produced during the light reactions of photosynthesis? Select one: a. Splitting of water b. Glucose c. Phosphoglyceraldehyde d. Atmospheric carbon dioxide e. ATP What is the ultimate source of cellular energy for all organisms? Select one: a. Electrons b. Heat c. Heterotrophs d. X-rays e. Sun What regulates the chemical reactions involved with both photosynthesis and cellular respiration? Select one: a. Enzymes b. Heat c. ATP d. Oxygen e. Chi Where does glycolysis take place? Select one: a. Chloroplast stroma b. Endoplasmic reticulum c. Inner membrane of the mitochondria d. Cytoplasm e. Mitochondria matrix

Explanation / Answer

Ans. 12. Correct option. D. atmospheric CO2. The source of CO2 in Calvin cycle is atmospheric cycle.

#a. Incorrect. Splitting of water produces O2 , protons, and electrons but no CO2.

#b. Incorrect. Glucose may be end product of Calvin cycle. All the C-atoms in glucose come from atmospheric CO2 taken up by plant.

#c. Incorrect. Phosphoglyceraldehyde does not act as source of CO2 in this pathway.

3e. ATP does not yield CO2 anywhere is cell.

Ans. 13. Correct option a. Splitting of water. Photolysis of water produces O2 which is further released into the atmosphere.

Ans. 14. Correct option e. Sun. Sun is the ultimate source of energy on Earth for all living organisms. The solar energy is converted into chemical energy (carbohydrates, like glucose, etc.) during photosynthesis by photoautotrophs. The heterotrophs directly or indirectly depend on photoautotrophs for energy source. The carbohydrate (and lipids, proteins) obtained from photoautotrophs (and in turn, the energy transformed from solar energy) is use to produce ATP during cellular respiration in all organisms.

#a. Incorrect. High energy electrons from NADH and FADH2 are used to establish proton gradient through ETC, which is further harvested in form of ATP. However, those high energy electrons come from glucose (or other substrates) that was basically synthesized by plants by converting solar energy into chemical energy.

#15. Correct options. A. Enzymes. All the chemical reactions involved in photosynthesis and cellular respiration or almost all metabolic pathways in living organisms are cata;yse and regulated by enzyme- the biocatalyst of living system.

#16. Correct option. D. Cytoplasm. Glycolysis takes place in cytoplasm of the cell where glycolytic enzymes are present.

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