Question 1

Which of the following statements best describes the endosymbiotic theory for the origin of mitochondria in eukaryotic cells?

Accepted Answer

Mitochondria originated from a symbiotic relationship between a larger ancestral cell and a smaller aerobic prokaryote that was engulfed but not digested.

Question 2

Which chemical is the main component of fungal cell walls?

Accepted Answer

Chitin

Question 3

A fungus that grows as a yeast at 37°C but as a mold at 25°C is best described as:

Accepted Answer

Dimorphic

Question 4

Which of the following is NOT a characteristic of all protozoa?

Accepted Answer

Presence of a cell wall

Question 5

Which of the following best explains why fungi are important decomposers in ecosystems?

Accepted Answer

They break down complex organic matter into simpler compounds, recycling nutrients.

Question 6

Which of the following is a correct description of the fungal reproductive structure 'sporangiospore'?

Accepted Answer

A spore enclosed in a sac

Question 7

Which of the following is a mutualistic relationship involving fungi that is crucial for plant nutrient uptake?

Accepted Answer

Mycorrhizae

Question 8

Which of the following is a distinguishing feature of algae compared to fungi?

Accepted Answer

Algae contain chloroplasts and perform photosynthesis.

Question 9

A patient presents with a fungal infection after taking broad-spectrum antibiotics. The most likely causative agent is:

Accepted Answer

Candida albicans

Question 10

Which of the following best describes the arrangement of microtubules in the flagella of eukaryotic cells?

Accepted Answer

$$9+2$$

Question 11

Which of the following is a real-world example of a fungal toxin with historical significance?

Accepted Answer

Aflatoxin produced by Aspergillus flavus, which contaminated food supplies and caused mass poisoning.

Question 12

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

Accepted Answer

Plasmogamy → Karyogamy → Meiosis

Question 13

Which of the following is a significant economic role of brown algae?

Accepted Answer

Production of alginic acid used to improve the texture of ice cream and chocolate milk.

Question 14

Which of the following protozoan groups is characterized by the presence of cilia and two types of nuclei?

Accepted Answer

Ciliophora

Question 15

Which of the following best explains why dinoflagellate blooms (red tides) are a public health concern?

Accepted Answer

They produce toxins that accumulate in seafood, causing neurological symptoms in humans.

Question 16

Which of the following is a correct description of the life cycle of a cestode (tapeworm)?

Accepted Answer

Eggs are released in the environment, ingested by an intermediate host, develop into larvae, and then infect the definitive host where they mature into adults.

Question 17

Which of the following is a distinguishing feature of nematodes (roundworms) compared to flatworms?

Accepted Answer

Nematodes have a complete digestive tract.

Question 18

Which of the following is a correct statement about the role of fungi in biotechnology?

Accepted Answer

Fungi are used in the production of antibiotics, alcohol, organic acids, and in genetic studies.

Question 19

Which of the following is a correct method for identifying parasitic helminths in a clinical laboratory?

Accepted Answer

Microscopic detection of eggs, larvae, or adult worms in patient samples.

Question 20

Which of the following best describes the ecological role of planktonic algae in aquatic environments?

Accepted Answer

They form the base of the food web and produce most of the world's oxygen.

Chapter 12: Eukaryotic Cells and Microorganisms – Fungi, Algae, Protozoa, and Parasitic Helminths

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