19. Where i n eukaryotes do most of the reactions of the Citric Acid Cycle take

Question

19. Where i n eukaryotes do most of the reactions of the Citric Acid Cycle take place? a. Nucleus b. Cytosol c. Endoplasmic reticulum d. Lysosome e. Mitochondria 20. In the Citric Acid Cycle, carbon atoms are removed from substrates and released as CO. How many CO2 molecules are released from a single citrate molecule as it proceeds through a single cycle? a. 1 b. 2 c. 3 d. 4 e, 5 21. Which molecule is the repository of inheritable genetic information in most organisms? a. Protein b. Carbohydrate c. RNA d. DNA e. Lipid 22. Chitin and amylopectin are examples of what class of biomolecule? a. Proteins b. Nucleic acids c. Carbohydrates d. Cofactors e. Lipids 23. The ultimate electron acceptor in the electron transport chain is a. pyruvate b. NAD C. FAD. d. Oxygen e. ATP 24. How many electrons are transferred by Complex I of the electron transport chain into the inner membrane space upon oxidation of a single molecule of NADH? a. One b. Two c. Three d. Four e. None of the above 25. Iron deficiency in a cell can adversely affect electron transport at which of the following sites? a. b. c. d. e. Pyruvate dehydrogenase Coenzyme A and FADH2 Coenzyme A and NADH NADH and FADH2 Cytochrome b and cytochrome c

Explanation / Answer

Please be informed as per Chegg’s policy I will answer first four questions only.

19. Citric acid cycle in eukaryotes takes place in mitochondrial matrix. Therefore, your answer is (e). Other options are wrong because- In nucleus - DNA transcription takes place, In cytosol – Glycolysis takes place, Endoplasmic reticulum – Folding of proteins takes place, Lysosome – Different enzymatic functions take place in lysosomes.

20. In citric acid cycle one molecule of citric acid or citrate yields two CO2 molecules in one pass of cycle. These CO2 molecules are released at step 4 (where iso-citrate is converted to alpha-keto-glutarate) and at step 5 (where alpha-keto-glutarate is converted to succinyl CoA). Therefore, your answer is (b)

21. In living organisms DNA is the molecule that stores genetic information. RNA helps in coding, decoding, regulation, and expression of genetic information. Proteins, lipids and carbohydrates are molecules that build the structure of the organism and also help it perform various metabolic processes.

22. Chitin and amylopectin are both derivatives of carbohydrates. Therefore, your answer is (c ). Other options proteins, lipids, cofactors, and nucleic acids are all different class of molecules.

23. The ultimate electron acceptor in electron transfer chain is molecular oxygen. Therefore, your answer is (d). Other options NAD+ and FAD+ are proton acceptor, while pyruvate and ATP do not take part in electron transfer.

24. In electron transport chain two electrons are removed from NADH and ultimately transferred to a lipid-soluble carrier by complex 1. Therefore, your answer is (b).

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