Question 1

Which of the following best explains the endosymbiotic theory for the origin of eukaryotic cells?

Accepted Answer

Eukaryotic cells evolved from cell-merging events between an ancient eukaryotic ancestor and certain prokaryotes, leading to organelles like mitochondria and chloroplasts.

Question 2

A scientist observes a eukaryotic cell with a network of fibers as its outermost layer, composed of polysaccharides, glycoproteins, and glycolipids. What is this structure called?

Accepted Answer

Glycocalyx

Question 3

Which of the following statements about mitosis and meiosis in eukaryotic cells is correct?

Accepted Answer

Mitosis produces two genetically identical diploid cells, while meiosis produces four genetically unique haploid cells.

Question 4

A patient is diagnosed with a fungal infection acquired after a hospital stay. Which type of infection is this most likely to be?

Accepted Answer

Hospital-associated infection

Question 5

Which of the following best describes the function of phagocytosis in eukaryotic cells?

Accepted Answer

Importing undissolved substances by engulfing them into vesicles

Question 6

A fungus is observed to have long, continuous chains with many nuclei and no divisions between cells. What type of hyphae does this fungus possess?

Accepted Answer

Aseptate hyphae

Question 7

Which of the following is a key difference between protozoa and fungi?

Accepted Answer

Protozoa are heterotrophic and usually unicellular, while fungi can be unicellular or multicellular and absorb nutrients from the environment.

Question 8

Which of the following best describes the life cycle stages of protozoa relevant to clinical treatment?

Accepted Answer

Trophozoite (active, feeding) and cyst (dormant)

Question 9

A patient presents with a parasitic infection caused by a multicellular organism that lays microscopic eggs, which are easily transmitted by contact with contaminated surfaces. Which organism is most likely responsible?

Accepted Answer

Pinworm (a type of helminth)

Question 10

Which of the following statements about algae is correct?

Accepted Answer

Algae are unicellular, aquatic, photosynthetic organisms that lack true roots, stems, and leaves.

Question 11

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

Accepted Answer

Nine-plus-two arrangement of tubulin microtubules

Question 12

A fungal species produces spores through mitosis. What type of spores are these?

Accepted Answer

Asexual spores

Question 13

Which of the following is a characteristic of dimorphic fungi?

Accepted Answer

They can switch between unicellular yeast and multicellular mold forms depending on environmental conditions.

Question 14

Which of the following best explains why helminth eggs are difficult to eliminate from the environment?

Accepted Answer

Helminth eggs are protected by a tough shell, allowing them to survive harsh conditions.

Question 15

A protozoan is observed to move using 'false feet.' What is the scientific term for these structures?

Accepted Answer

Pseudopods

Question 16

Which of the following is a correct statement about the reproduction of protists?

Accepted Answer

Protists can reproduce both sexually and asexually.

Question 17

A patient is infected with a protozoan that does not form cysts. Which of the following is a likely implication for disease transmission?

Accepted Answer

The protozoan is less likely to be transmitted via the fecal-oral route.

Question 18

Which of the following best describes the role of algae in the global ecosystem?

Accepted Answer

Algae are responsible for producing about half of the Earth's atmospheric oxygen.

Question 19

Which of the following is a correct description of the process of exocytosis in eukaryotic cells?

Accepted Answer

Exocytosis exports substances out of the cell by vesicle fusion with the plasma membrane.

Question 20

A researcher is studying a eukaryotic microorganism that is unicellular, photosynthetic, and lacks true roots, stems, and leaves. Which group does this organism most likely belong to?

Accepted Answer

Algae

BIO Exam 1: Ch 4

Study Guide - Practice Questions

Study Guide - Flashcards