$$\text{Plasmogamy} \rightarrow \text{Karyogamy} \rightarrow \text{Meiosis}$$

Question 1

Which of the following best explains why fungi are classified as chemoheterotrophs?

Accepted Answer

They decompose organic matter and absorb nutrients from their environment.

Question 2

A patient presents with a fungal infection that affects only the hair shafts. Which type of mycosis is most likely responsible?

Accepted Answer

Superficial mycosis

Question 3

Which feature distinguishes septate hyphae from coenocytic (aseptate) hyphae in fungi?

Accepted Answer

Septate hyphae have cross-walls (septa) dividing the cells, while coenocytic hyphae lack septa and contain many nuclei in a continuous cytoplasm.

Question 4

Which of the following statements about fungal spores is correct?

Accepted Answer

Asexual spores arise from mitosis and do not result in genetic variation.

Question 5

A fungus is observed to grow as yeast at 37°C and as mold at 25°C. What term best describes this organism?

Accepted Answer

Dimorphic

Question 6

Which phase of fungal sexual reproduction involves the fusion of two haploid nuclei to form a diploid zygote?

Accepted Answer

Karyogamy

Question 7

Which medically important fungal phylum is characterized by coenocytic hyphae and produces zygospores sexually?

Accepted Answer

Mucoromycota (Zygomycota)

Question 8

A patient with AIDS develops pneumonia caused by Pneumocystis. This is an example of which type of mycosis?

Accepted Answer

Opportunistic mycosis

Question 9

Which of the following fungi is responsible for producing ergot toxin, a potent neurotoxin that can cause seizures and psychosis?

Accepted Answer

Claviceps purpurea

Question 10

Which economic product is NOT correctly matched with its fungal source?

Accepted Answer

Taxol – Trichoderma

Question 11

Which of the following is a characteristic of Microsporidia?

Accepted Answer

They are obligate intracellular parasites and lack mitochondria.

Question 12

Which of the following statements about protozoa is correct?

Accepted Answer

Protozoa digest food in vacuoles and eliminate waste through an anal pore.

Question 13

Which group of protozoans is responsible for malaria and is characterized by complex life cycles involving sexual and asexual stages?

Accepted Answer

Apicomplexa

Question 14

A patient is diagnosed with dysentery caused by a ciliated protozoan. Which organism is most likely responsible?

Accepted Answer

Balantidium coli

Question 15

Which phase in the Apicomplexan life cycle is responsible for producing the infective sporozoite stage?

Accepted Answer

Sporogony

Question 16

Which of the following is a correct sequence of events in the sexual reproduction of fungi?

Accepted Answer

$$	ext{Plasmogamy} ightarrow 	ext{Karyogamy} ightarrow 	ext{Meiosis}$$

Question 17

Which of the following is true regarding the life cycle of Plasmodium (malaria parasite)?

Accepted Answer

A mosquito injects sporozoites, which undergo schizogony in the human liver.

Question 18

Which of the following statements about helminths is correct?

Accepted Answer

Helminths may lack digestive systems and have complex reproductive systems.

Question 19

A tapeworm is found to have proglottids containing both male and female reproductive organs. What term best describes this organism?

Accepted Answer

Monoecious (hermaphroditic)

Question 20

Which of the following arthropod classes is correctly matched with its number of legs?

Accepted Answer

Crustacea – four antennae

Chapter 12: The Eukaryotes—Fungi, Algae, Protozoa, and Helminths (Microbiology Study Notes)

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