Which of the following is NOT TRUE about fatty acid biosynthesis? A. 8 NADPH is used to produce palmitate. B. The growing fatty acid chain is elongated by the sequential addition of two-carbon units. C. The process is repeated 7 times to produce palmitate. D. The process occurs in the cytosol.
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Which of the following is NOT TRUE about fatty acid biosynthesis?
A. 8 NADPH is used to produce palmitate.
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- Which of the following is an important end product of disassembly of fatty acids? answer choices A.) DNA gyrase B.) Pyruvate C.) Acetyl CoA D.) Succinate dehydrogenaseThe function of the citric acid cycle is to (a) produce energy during periods of active muscle contraction. (b) break six-carbon chains into three-carbon fragments. (c) prepare the glucose molecule for further reactions. (d) remove hydrogen atoms from organic molecules and transfer them to coenzymes.What might you expect if a mutation caused the ATP-allosteric site on phosphofructokinase to be permanently inactive? a. Less glucose transported into the cell. b. No effect on ATP production. c. Decreased ATP production d. Excessive ATP production.
- As you learned in class, many enzymes can catalyze the forward and reverse directions of a chemical reaction. If Lactaid was mixed with a solution that is very high in glucose and galactose, do you think Lactaid can catalyze the production of lactose? Please explain your answer in detail, and this question will require some additional research of your own.In the Alanine Cycle, different organs work together to produce glucose from protein. Which statement below best describes what happens in which organ? a)In liver, pyruvate is transaminated to alanine; in the muscle, alanine is deaminated and pyruvate is used for ATP synthesis. b)In muscle, pyruvate is transaminated to alanine; in the liver, alanine is deaminated and pyruvate is used for gluconeogenesis. c)The liver exports glucose for use by the brain; in the muscle, alanine is deaminated by the urea cycle for use in ATP generation. d)In muscle, pyruvate is transaminated to alanine; in the liver, alanine enters the urea cycle for excretion.Which of the following statements concerning the location of the metabolic pathways is correct? a. All reactions of the glycolysis take place in the mitochondria. b. All reactions of the TCA cycle take place in the mitochondria. c. Some reactions of the TCA cycle take place in the cytosol, and some in mitochondria. d. Some reactions of the glycolysis take place in the cytosol, and some in mitochondria.
- Starting with acetyl-CoA in the mitochondria, how many ATP molecules are needed to synthesize a 14 C fatty acid? A. 3 B. 6 C. 9 D. 12Which of the following statement regarding coenzyme A is incorrect? a) The B vitamin pantothenic acid is present as a subunit of its structure. b) Its main biochemical function is to transfer acetyl groups. c) Its structure contains a phosphorylated ADP.. d) The B vitamin pantothenic acid is the “active” subunit of the coenzyme A.CHOOSE THE CORRECT LETTER A new metabolic enzyme which utilizes NAD* as a coenzyme. Which of the following could be TRUE based on this information?A. It is involved in an anabolic pathway.B. It performs acetyl group transfer.C. It is involved in a catabolic pathway.D.It catalyzes a hydrolytic cleavage.
- What specific reaction cannot occur due to the presence of cyanide? A.Transfer of electrons to co-enzymes B.Inability to strip a carbon from pyruvate C.Transfer of electrons to and between carrier proteins D.Addition of a phosphate onto ADP to make ATPIn the Electron Transport Chain:(a). What are the two nucleotide molecules that are involved in funneling the electrons into the chain?(b). Indicate all the reactions (in the pathways) that are involved in the transfer of the electrons to these two nucleotides.The effect of ATP on the allosteric enzyme PFK-1 is shown below. For a given concentration of fructose 6-phosphate, the PFK-1 activity increases with increasing concentrations of ATP, but a point is reached beyond which increasing the concentration of ATP inhibits the enzyme. (a) Explain how ATP can be both a substrate and an inhibitor of PFK-1. How is the enzyme regulated by ATP? (b) In what ways is glycolysis regulated by ATP levels? (c) The inhibition of PFK-1 by ATP is diminished when the ADP concentration is high, as shown in the illustration. How can this observation be explained? *A graph is included for this question*
