Q: Which equation represents the conversion of pyruvate to lactate during fermentation?

$$\text{Pyruvate} + NADH + H^+ \rightarrow \text{Lactate} + NAD^+$$

Q: Which of the following is a correct equation for the synthesis of peptidoglycan in bacteria?

$$\text{UDP-N-acetylmuramic acid} + \text{UDP-N-acetylglucosamine} \rightarrow \text{Peptidoglycan}$$

Q: Which of the following is a correct equation for the decarboxylation of an amino acid?

$$\text{Amino acid} \rightarrow \text{Amine} + CO_2$

Question 1

Which of the following pathways is responsible for the conversion of glucose to pyruvate in most microorganisms?

Accepted Answer

Glycolysis (Embden-Meyerhof-Parnas pathway)

Question 2

During the glyoxylate cycle, which two key enzymes bypass the decarboxylation steps of the citric acid cycle, allowing microorganisms to utilize acetate as a carbon source?

Accepted Answer

Isocitrate lyase and malate synthase

Question 3

Which fermentation product is commonly associated with the mixed acid fermentation pathway in bacteria such as Escherichia coli?

Accepted Answer

Acetate

Question 4

A yeast strain is engineered to accumulate high levels of polyhydroxybutyrate (PHB). Which metabolic pathway is most directly involved in PHB biosynthesis?

Accepted Answer

Acetyl-CoA pathway

Question 5

Which of the following equations correctly represents the net ATP yield from one molecule of glucose during glycolysis in prokaryotes?

Accepted Answer

$$2 	imes ATP$$

Question 6

In the biosynthesis of aromatic amino acids, which pathway is primarily responsible for the formation of chorismate, a key precursor?

Accepted Answer

Shikimate pathway

Question 7

Which enzyme catalyzes the conversion of ribonucleotides to deoxyribonucleotides in nucleic acid metabolism?

Accepted Answer

Ribonucleotide reductase (RNR)

Question 8

A bacterium is growing on camphor as its sole carbon source. Which class of enzymes is primarily responsible for the initial ring cleavage of camphor?

Accepted Answer

Monooxygenases and dioxygenases

Question 9

Which of the following is a correct description of the urea cycle in microbial metabolism?

Accepted Answer

It converts ammonia to urea for excretion.

Question 10

Which metabolic pathway allows microorganisms to utilize sugars other than glucose, such as galactose or mannose?

Accepted Answer

Alternative sugar utilization pathways

Question 11

A mutation in the gene encoding isocitrate lyase would most directly affect which microbial metabolic process?

Accepted Answer

Glyoxylate cycle

Question 12

Which of the following is a secondary metabolite produced by microorganisms and used as an antibiotic?

Accepted Answer

Penicillin

Question 13

In the catabolism of amino acids, which process involves the removal of an amino group as ammonia?

Accepted Answer

Oxidative deamination

Question 14

Which equation represents the conversion of pyruvate to lactate during fermentation?

Accepted Answer

$$	ext{Pyruvate} + NADH + H^+ ightarrow 	ext{Lactate} + NAD^+$$

Question 15

Which metabolic process is essential for microbial growth on C1 compounds such as methanol or methane?

Accepted Answer

Methylotrophy

Question 16

Which of the following is a correct equation for the synthesis of peptidoglycan in bacteria?

Accepted Answer

$$	ext{UDP-N-acetylmuramic acid} + 	ext{UDP-N-acetylglucosamine} ightarrow 	ext{Peptidoglycan}$$

Question 17

Which pathway is primarily responsible for the biosynthesis of purine nucleotides in microorganisms?

Accepted Answer

De novo purine biosynthesis pathway

Question 18

A microorganism is found to degrade hydrocarbons using both ortho and meta ring cleavage. Which enzymes are most likely involved?

Accepted Answer

Monooxygenases and dioxygenases

Question 19

Which of the following is a correct equation for the decarboxylation of an amino acid?

Accepted Answer

$$	ext{Amino acid} ightarrow 	ext{Amine} + CO_2$

Question 20

Which secondary metabolite is produced by Aspergillus species and is known for its toxic effects?

Accepted Answer

Aflatoxin

Biochemical Pathways and Microbial Metabolism: Syllabus Overview and Study Guide

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