Question

Question 111 pts

The synthesis of ethanol by yeast may be summarized as:

lactate to acetaldehyde to ethanol

Group of answer choices

True

False

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Question 121 pts

In glycolysis, glucose is converted into two 3-carbon molecules.

Group of answer choices

True

False

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Question 131 pts

"Substrate-level phosphorylation" refers to the synthesis of ATP by a mechanism other than oxidative phosphorylation

Group of answer choices

True

False

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Question 141 pts

A thioester is a high-energy intermediate in metabolism.

Group of answer choices

True

False

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Question 151 pts

In glycolysis, pyruvate kinase is used to synthesize pyruvate and ATP from phosphoenolpyruvate.

Group of answer choices

True

False

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Question 161 pts

Pyruvate is the end product of anaerobic glycolysis.

Group of answer choices

True

False

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Question 171 pts

The conversion of pyruvate to lactate in anaerobic glycolysis serves an important role in regenerating NAD+.

Group of answer choices

True

False

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Question 181 pts

Pasteur effect demonstrates the inhibition of glycolysis by oxygen.

Group of answer choices

True

False

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Question 191 pts

Major fuel molecules can be metabolized by the TCA cycle.

Group of answer choices

True

False

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Question 201 pts

Biomolecules with a thioester linkage have higher free energy than an ester linkage.

Group of answer choices

True

False

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Question 211 pts

Anapleurotic pathway associated with the TCA cycle is important for maintaining its working capacity.

Group of answer choices

True

False

Answer 1

Question number 11) False

Explanation:

During ethanol fermentation pathway, glucose is converted into pyruvate. Further, the enzyme pyruvate decarboxylase catalyses the conversion of pyruvate to acetaldehyde. Then acetaldehyde is converted into ethanol catalyzed by the enzyme alcohol dehydrogenase.

Question number 12)

Answer: True

Explanation:

Glycolysis is a metabolic pathway of an organism in which glucose will be converted into pyruvate in a sequence of reactions. Glucose consists of six carbon atoms and pyruvate is a three carbon compounds, hence, in glycolysis, glucose is converted into two 3-carbon molecules.

Question number 13)

Answer: True

Explanation:

Substrate-level phosphorylation represents a metabolic reaction in which substrates having higher energies is converted into a lower energy produce as a result ATP or GTP will be generated.

Question number 14)

Answer: True

Explanation:

Thioesters represent the most common intermediate formed in many of the biosynthetic pathways. Some of the examples of thioesters are acetyl-CoA, malonyl-CoA etc. Thioesters has high free energy which is almost similar to the reactants.

Question number 15)

Answer: True

Explanation:

This reaction constitutes the last step in the glycolysis, where the enzyme pyruvate kinase transfer one phosphate group from phosphoenolpyruvate to adenosine diphosphate (ADP). This results in the production of adenosine triphosphate (ATP) and pyruvate.

Question number 16)

Answer: False

Explanation:

Pyruvate is the end product of the aerobic glycolysis whereas in anaerobic glycolysis the pyruvate formed will be rapidly converted into lactate. Hence, the endproduct of anaerobic glycolysis is lactate.

Question number 17)

Answer: True

Explanation:

The supply of NADH are limited and therefore the cell will recycle NADH. Two NADH molecules are produced as a result of single glycolysis pathway and these NADH molecules formed should be oxidized into NAD+ for the glycolysis process to continue. Thus, the conversion of pyruvate to lactate will oxidize NADH to form NAD+.