Question 1

Which of the following best describes the process of osmiotrophy in fungi?

Accepted Answer

Secretion of exoenzymes to digest polymers extracellularly, followed by absorption of monomers.

Question 2

During aerobic respiration in fungal cells, what is the net ATP yield from glycolysis per molecule of glucose?

Accepted Answer

$$2$$

Question 3

Which enzyme pair is essential for the glyoxylate cycle in fungi, allowing growth on acetate as a carbon source?

Accepted Answer

Isocitrate lyase and malate synthase

Question 4

Which fungal structure is responsible for anchoring the organism to its substrate, as shown in the first image?

Accepted Answer

Rhizoidal hyphae

Question 5

Which metabolic pathway allows fungi to bypass the decarboxylation steps of the TCA cycle and conserve carbon?

Accepted Answer

Glyoxylate cycle

Question 6

Which class of antifungal drugs targets the synthesis of β-(1,3)-glucans in the fungal cell wall?

Accepted Answer

Echinocandins

Question 7

What is the primary function of siderophores produced by fungi?

Accepted Answer

To chelate and transport ferric iron (Fe$$^{3+}) $$under iron-limited conditions

Question 8

Which of the following is a product of ethanolic fermentation in fungi under hypoxic conditions?

Accepted Answer

Ethanol and CO$$_2$$

Question 9

Which pathway is responsible for the biosynthesis of ergosterol in fungi, and which drug class targets this pathway?

Accepted Answer

Mevalonate pathway; targeted by azoles

Question 10

A fungal mutant lacks isocitrate lyase. Which metabolic process will be most directly impaired?

Accepted Answer

Glyoxylate cycle

Question 11

Which of the following best explains why fungi can grow on lipids as a sole carbon source?

Accepted Answer

They utilize the glyoxylate cycle to convert acetyl-CoA from lipid breakdown into oxaloacetate for gluconeogenesis.

Question 12

Which specialized fungal metabolite is responsible for neutralizing reactive oxygen species and protecting against UV irradiation?

Accepted Answer

DHN-melanin pigments

Question 13

Which of the following is assembled by non-ribosomal peptide synthetases (NRPS) in fungi?

Accepted Answer

Penicillin

Question 14

A patient is treated with amphotericin B for a fungal infection. What is the drug’s primary target?

Accepted Answer

Disruption of ergosterol in the plasma membrane

Question 15

Which step in fungal metabolism is directly responsible for the net conversion of two-carbon compounds into four-carbon oxaloacetate?

Accepted Answer

Glyoxylate cycle

Question 16

Which structure in the fungal morphology diagram is responsible for asexual spore production?

Accepted Answer

Sporangium

Question 17

Which of the following best describes the role of UDP-N-acetylglucosamine in fungal cell wall synthesis?

Accepted Answer

It is a precursor for β-(1,3)-glucan and chitin polymer formation.

Question 18

Which of the following is a direct consequence of fungal ethanolic fermentation under hypoxic conditions?

Accepted Answer

Regeneration of NAD$$^+ to $$sustain glycolytic flux

Question 19

Which of the following is NOT a function of polyketide synthases (PKS) in fungi?

Accepted Answer

Synthesis of non-ribosomal peptides like penicillin

Question 20

Which of the following best summarizes the sequence of major metabolic steps in fungal metabolism?

Accepted Answer

Osmiotrophy → Catabolism → Structural Anabolism → Glyoxylate Bypass → Secondary Metabolites

Fungal Metabolism: Biochemistry & Energetics

Study Guide - Practice Questions