Question 1

Which of the following best describes the major difference between plasmodial and cellular slime moulds?

Accepted Answer

Plasmodial slime moulds form a single, multinucleate mass, while cellular slime moulds aggregate as individual cells during certain life stages.

Question 2

A researcher is studying a eukaryotic microorganism that engulfs bacteria using lobe-shaped pseudopods and lacks a permanent multicellular stage. To which group does this organism most likely belong?

Accepted Answer

Tubulinids

Question 3

Which of the following statements about the evolutionary relationship between fungi and animals is correct?

Accepted Answer

Fungi and animals are both part of the Opisthokont clade, sharing a more recent common ancestor with each other than with plants.

Question 4

Entamoeba histolytica is a significant human pathogen. Which of the following best explains its impact on global health?

Accepted Answer

It causes amoebic dysentery, infecting millions and resulting in tens of thousands of deaths annually.

Question 5

Which of the following is a defining feature of the Unikonta supergroup?

Accepted Answer

It includes organisms with a single flagellum or is derived from ancestors with a single flagellum.

Question 6

A scientist discovers a fungus that forms arbuscular mycorrhizal associations with plant roots. To which fungal group does this organism most likely belong?

Accepted Answer

Glomeromycetes

Question 7

Which of the following best explains why some fungi exhibit enhanced growth when exposed to ionizing radiation?

Accepted Answer

They use melanin to harvest energy from radiation, a process known as radiotrophism.

Question 8

Which of the following equations correctly represents the relationship between the number of possible mating types ($$n) in a $$fungal species and the number of different sex-determining loci ($$l$$), each with $$a$$ alleles?

Accepted Answer

$$n = a^l$$

Question 9

A marine biologist is investigating a disease outbreak in farmed fish caused by amoebic gill disease. Which organism is most likely responsible?

Accepted Answer

Neoparamoeba perurans

Question 10

Which of the following best describes the ecological role of chytrid fungi in aquatic environments?

Accepted Answer

They decompose organic matter and can control algal blooms by infecting algae.

Question 11

Which of the following is a real-world example of a fungus with a massive, long-lived individual organism, and what is its significance?

Accepted Answer

Armillaria (the 'Humongous Fungus'), which covers several square kilometers and is among the largest and oldest living organisms.

Question 12

Which of the following statements about choanoflagellates is correct?

Accepted Answer

They are the closest living relatives of animals and can form simple colonies.

Question 13

A student observes a eukaryotic microorganism with a silica-based shell in a freshwater sample. Which group does this organism most likely belong to?

Accepted Answer

Nucleariids

Question 14

Which of the following best explains why some slime moulds are used as model organisms in studies of cooperation and multicellularity?

Accepted Answer

They exhibit both unicellular and multicellular stages, allowing researchers to study the evolution of cooperation and differentiation.

Question 15

Which of the following is a correct statement about the feeding strategy of fungi?

Accepted Answer

Fungi feed by external digestion and absorption of nutrients from their environment.

Question 16

A fungus launches its spores several centimeters away using a specialized structure. Which species is this, and what is the adaptive advantage of this mechanism?

Accepted Answer

Pilobolus crystallinus; it increases the likelihood that spores land on fresh substrates, such as herbivore dung.

Question 17

Which of the following best describes the relationship between mycorrhizal fungi and plants?

Accepted Answer

It is a mutualistic relationship where fungi enhance nutrient uptake for plants in exchange for carbohydrates.

Question 18

Which of the following is a correct statement about the diversity of sexual reproduction in fungi?

Accepted Answer

Some fungal species have thousands of different mating types, increasing genetic diversity.

Question 19

Which of the following best explains why the Unikonta supergroup is considered highly diverse?

Accepted Answer

It includes a wide range of eukaryotic organisms, from single-celled amoebae to multicellular animals and fungi.

Unikonta, Amoebozoans, and Animal Diversity: Foundations for General Biology

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