Question

The following statements refer to Phosphoenolpyruvate carboxykinase (PEPCK). Which statement in A through D is INCORRECT?...

The following statements refer to Phosphoenolpyruvate carboxykinase (PEPCK). Which statement in A through D is INCORRECT?

a. ADP is a negative allosteric modifier

b. its activity is increased following phosphorylation

c. it catalyzes the synthesis of a high energy bond

d. it is one of the energy consuming steps in gluconeogenesis

e. it catalyzes a decarboxylation reaction

Homework Answers

Answer #1

Ans: b ). Option b is the incorrect statement regarding the PEPCK enzyme.

Dephosphorylation increases the activity of PEPCK.

When the energy status of the cell is high then gluconeogenesis takes place and there will be a lot of ATP available. This promotes gluconeogenesis. If energy status is low, that is free ADP is available in large amounts, then gluconeogenesis will not take place. The free ADP allosterically inhibit PEPCK.

PEPCK catalyzes the conversion of oxaloacetate to phosphoenolpyruvate by decarboxylation. In this step 1 GTP molecule is used to create a high energy bond.

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
MULTIPLE CHOICE 1. Many of the catabolic pathways converge to the common two-carbon intermediate: a. alanine....
MULTIPLE CHOICE 1. Many of the catabolic pathways converge to the common two-carbon intermediate: a. alanine. b. acetyl group of acetyl-CoA. c. lactic acid. d. glucose. e. carbon dioxide. 2. The lower (“energy payoff”) part of glycolysis: Only involves steps with DG close to zero, so it does not need to be regulated. Involves the formation of metabolites with high-energy phosphates. Involves enzymes that hydrolyse ATP to drive the pathway forward. Oxidises NADP+ to NADPH. 3. Gluconeogenesis begins with the...
Which if the following statements is incorrect? A. Reaction with higher activation energy has higher rate...
Which if the following statements is incorrect? A. Reaction with higher activation energy has higher rate constant B. The catalyst does not affect the equilibrium of a reaction C. Half-life period of a first order reaction is independent of the final concentration D. In an endothermic reaction, the activation energy of the reverse reaction is lower than that of the forward reaction.
Which of the following statements are true regarding C4 plants? a. Initial fixation of CO2 is...
Which of the following statements are true regarding C4 plants? a. Initial fixation of CO2 is catalyzed by PEP carboxylase b. Fewer ATP are used as compared to C3 plants c. Stomata are only open at night d. Photorespiration is increased e. All of the above are correct Which of the reactants becomes reduced in the reaction below? C6H12O6 + 10 NAD+ + 2 FAD + ADP + Pi à 6 CO2 + 10 NADH + 2 FADH2 + ATP...
1. Actin filaments and microtubules have certain similarities. Which one of the following statements would NOT...
1. Actin filaments and microtubules have certain similarities. Which one of the following statements would NOT be a similarity between acting filaments and microtubules? a. They are both formed from globular protein monomers. b. They are both unstable and can form and then fall apart. c. They both involved bidding of a nucleotide triphosphate. d. They both form a hollow tube-like structure. 2. Which of the following characteristic is NOT TRUE regarding the function and structure of the enzyme ATP...
1. Which of the following statements about the process of translation is INCORRECT? a. Translation ends...
1. Which of the following statements about the process of translation is INCORRECT? a. Translation ends when the ribosome encounters a stop codon. b. The polypeptide might be attached to a tRNA found either in the “A” site or in the “P” site of the ribosome. c. Ribosomes and initiation factors begin translation by locating the promoter. d. An “empty” tRNA (attached neither to an amino acid nor to a polypeptide) might be found either in the “E” or in...
Which of the following statements about DNA repair is correct during excision repair, an exonuclease is...
Which of the following statements about DNA repair is correct during excision repair, an exonuclease is the first enzyme involved in removing a single-stranded segment of DNA from the template strand none of the answer is correct during mismatch repair, a methylated guanine in the consensus sequence GATC found on the parent strand activates the Mut complex the Okazaki fragments synthesized during base excision repair are synthesized in a 3’ -- > 5’ fashion repair of methylated DNA requires a...
1) Mitochondrial DNA is a) maternally inherited b) paternally inherited c) responsible for multiple sclerosis d)...
1) Mitochondrial DNA is a) maternally inherited b) paternally inherited c) responsible for multiple sclerosis d) 10 times less likely to mutate than nuclear DNA 2) All of the following statements about the enzymic complex that carries out the synthesis of ATP during oxidative phosphorylation are correct EXCEPT: A. It is located on the matrix side of the inner mitochondrial membrane. B. It is inhibited by oligomycin. C. It contains a proton channel. D. It can exhibit ATPase activity. E....
1. Which sentence best defines signal transduction in a biochemical context? a. Alteration of cell functions...
1. Which sentence best defines signal transduction in a biochemical context? a. Alteration of cell functions in response to the environment b. Generation of a chemical change in response to information c. Induction of cell death upon nutrient starvation d. Responses to stimuli 2. Which statement is correct? a. G protein-coupled receptors produce second messengers indirectly while receptor enzymes catalyse second messenger generation b. Second messengers stimulate the activity of G protein-coupled receptors. c. Receptor enzymes produce second messengers through...
BIOCHEMISTRY ASSIGNMENT Please use your understanding to address the few concerns below * Required Index Number:...
BIOCHEMISTRY ASSIGNMENT Please use your understanding to address the few concerns below * Required Index Number: * Your answer Program: Choose BSc Midwifery BSc Nursing Which of the diagrams illustrates the way in which the rate of an enzyme-controlled reaction depends on substrate concentration? * Captionless Image A B C D When starch and amylase are mixed in the presence of iodine solution, the blue-black colour rapidly disappears. This is due to the formation of which molecule? * glucose glycogen...
BIOCHEMISTRY ASSIGNMENT Please use your understanding to address the few concerns below * Required Index Number:...
BIOCHEMISTRY ASSIGNMENT Please use your understanding to address the few concerns below * Required Index Number: * Your answer Program: Choose BSc Midwifery BSc Nursing 1.When starch and amylase are mixed in the presence of iodine solution, the blue-black colour rapidly disappears. This is due to the formation of which molecule? * a) glucose b) glycogen c) sucrose d) maltose 2.Which of the following enzyme groups can catalyse oxidation reactions? * a) phosphorylases b) isomerases c) hydrolases d) dehydrogenases 3.Enzymes...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT