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27 May 2019

Through the course, youâve learned about many different catabolic and anabolic processes. Choose any one catabolic pathway AND any one anabolic pathway that we learned about in this course. Use these two pathways as examples of the general metabolic principles of catabolism and anabolism youâve learned about in this course. Make sure to describe the general purpose and major reactants and products of each of the pathways and how each pathway exemplifies principles of metabolism. (8 sentence maximum)

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Trinidad TremblayLv2

28 May 2019

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Related questions

1. What is meant by catabolic and anabolic reactions? Give an example of each.

2. Is the DG for an exergonic reaction more than or less than zero? What about an endergonic reaction? In which type of reaction do the products have more energy than the reactants? Why?

3. How do metabolic pathways keep from reaching equilibrium?

4. Describe the components of ATP. What is the purpose of ATP in the cell? How is it recycled?

5. What is meant by the E_A of a reaction? How do enzymes affect the E_A and the DG of a reaction?

6. Describe the cycle of an enzyme as it catalyzes a reaction.

7. How does an enzyme lower the E_A of a reaction?

8. What is the difference between a competitive and a non-competitive inhibitor of an enzyme? Which type of inhibition can be overcome by increasing the substrate concentration? Why?

9. Describe how an allosteric enzyme works.

10. Why is feedback inhibition important in metabolic pathways?

11. Define Energy. What are the different types of Energy?

12. What are the laws of Thermodynamics?

13. Explain redox reactions.

2. Explain the structural role of the four different categories of biomolecules within a cell.

3. Explain how water, a steroid hormone, and a monosaccharide are transported into a cell down their concentration gradient and explain why the different molecules are transported in different ways.

4. Explain which forms of transport require energy and why, and how ATP facilitates energy-dependent transport.

5. All of the different types of biomolecules can serve as energy sources. Explain which biomolecules are catabolized in which metabolic pathways.

6. Whether or not the cellular machinery is in place for particular catabolic reactions to go forward depends on which genes are being expressed. Explain the different points, in a eukaryotic cell, at which gene expression might be regulated, and how.

7. The primary tasks of any organism are survival and reproduction. Acquiring biomolecules and catabolizing them to generate energy is a major factor in survival. For reproduction to occur, DNA must first be replicated so that it can be passed on. Describe the process of DNA replication.

8. If you wanted to replicate DNA artificially in large quantities, how would you go about it?

9. Once DNA has been replicated, what is the sequence of events in the cell cycle and in cell division that produce the gametes for sexual reproduction? Where does this event fit, along with other cell cycles, in the life cycle of the organism?

10. A number of physical traits in humans are controlled by a simple dominant/recessive relationship between two alleles; here are some examples (dominant/recessive):

Widowâs peak/no widowâs peak

Free earlobes/attached earlobes

Cleft chin/no cleft chin

Dimples/no dimples

Freckles/no freckles

Naturally curly hair (really curly, not wavy)/straight hair

Make a pedigree of your immediate family indicating the possible genotype of each family member (for the six genes listed above) based on their phenotype. If you are adopted, indicate the possible genotypes and phenotypes of your parents. You may make this part up.

1. C6H12O6 + 6O2 Ã 6CO2 + 6H2O Glucose is being _____ to _____ and oxygen is being _____ to _____. a. oxidized; carbon dioxide; reduced; water b. oxidized; water; reduced; carbon dioxide Incorrect c. reduced; water; oxidized; carbon dioxide d. reduced; carbon dioxide; oxidized; water

2. Which of the following stages in the breakdown of the piece of toast you had for breakfast generates the most ATP? a. the citric acid cycle Incorrect b. glycolysis c. the digestion of starch to glucose d. oxidative phosphorylation

3. Which of the following is a catabolic pathway? a. gluconeogenesis b. production of starch Incorrect c. glycolysis d. production of glycogen

4. Per molecule, the oxidation of a fatty acid results in _____ energy storage than the oxidation of glucose. a. the same b. less Incorrect c. more d. None of the above; fatty acids cannot be oxidized.

5. Of the eight reactions in the citric acid cycle, how many are oxidation-reduction reactions? a. one b. two c. three d. four e. five

6. The process of glycolysis transfers the energy in sugar molecules into the stored energy of activated carriers such as ATP and NADH. Which statement is true about glycolysis? a. Only eukaryotic organisms do glycolysis. b. The ten reactions of glycolysis are identical in all eukaryotic cells, but are different in prokaryotic cells due to their diverse metabolic strategies. Incorrect c. The ten reactions of glycolysis are identical in almost all living organisms on the planet. d. There are many ways to oxidize glucose and transfer energy into activated carriers; the diversity of organisms on the planet is reflected in the diversity of their mechanisms of glycolysis.

7. Referring to the sentence completed in #13 above, the purpose of the latter reaction (in active muscle cells) is to _____. a. accumulate lactic acid in the cell, which provides additional energy for the production of ATP Incorrect b. slow down glycolysis until oxygen becomes available again c. accelerate the Krebs cycle, which will restore the oxygen supply d. regenerate NAD+ so that glycolysis can continue in the absence of oxygen

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9. Which statement is true about enzymes? a. Enzymes catalyze chemical reactions because they make inherently endergonic reactions exergonic. b. Each enzyme in a cell can catalyze many different chemical reactions involving chemically different substrates. Incorrect c. Enzymes can only catalyze reactions in one direction. d. After catalyzing a reaction, an enzyme is permanently altered and can no longer bind substrate. e. None of the above is true. 1

10. âG measures the change in free energy in a system as it converts reactant (Y) into product (X). When [X] = [Y], âG is equal to _____. a. RT b. ÎGÂ° + RT c. ÎGÂ° d. ln [X]/[Y]

11. The âGÂ° for the hydrolysis of ATP is -7.3 kcal/mol. What conditions in the cell would lead to a âG for ATP hydrolysis of -11 kcal/mol? a. An increase in the ATP/ADP ratio b. An increase in anabolic activity in the cell c. Transport of ATP out of the compartment where the reaction is occurring Incorrect d. A decrease in the ATP/ADP ratio

12. In the first reaction of glycolysis, a phosphate transferred from ATP to a glucose molecule to produce glucose-6-phosphate and ADP. Under conditions existing in the cell, the free energy change for this reaction is -8.0 kcal/mole. Which of the following statements is true? Recall that the âGÂ° for the hydrolysis of ATP is -7.3 kcal/mol. a. Glucose concentrations in the cell are always low, making this reaction more favorable than would be expected. b. This reaction is less favorable than would be expected, given the âGÂ° of ATP hydrolysis. c. Glucose-6-P concentrations in the cell are very low relative to glucose concentrations, making the reaction more favorable than would be expected. d. The âGÂ° for the addition of a phosphate to glucose must be -0.7 kcal/mole.

13. Protein E can bind to two different proteins, S and I. The binding reactions are described by the following equations and values: E + S --> ES Keq for ES = 10 E + I> EI Keq for EI = 2 Given the equilibrium constant values, which one of the following statements is true? a. When S is present in excess, no I molecules will bind to E. b. E binds I more tightly than S. c. The binding energy of the ES interaction is greater than that of the EI interaction. d. Changing an amino acid on the binding surface of I from a basic amino acid to an acidic one will probably make the free energy of association with E more negative.