Question 1

Which of the following best describes the difference between prokaryotic and eukaryotic cells as discussed in the study materials?

Accepted Answer

Eukaryotic cells have a nucleus and membrane-bound organelles, while prokaryotic cells do not.

Question 2

A student observes a microorganism under the microscope that is green, moves by rotating its flagella, and is unicellular. According to the dichotomous key, which group does this organism most likely belong to?

Accepted Answer

Phylum Chlorophyta (green algae)

Question 3

Which taxonomic rank is immediately more specific than 'Family' in the hierarchy shown in the study materials?

Accepted Answer

Genus

Question 4

If the field of view (FOV) under a scanning lens is 4 mm, what is the FOV in micrometers ($$\mu m$$)? Use the conversion $$1 	ext{ mm} = 1000 \mu m.$$

Accepted Answer

$$4000 \mu m$$

Question 5

Which of the following is NOT a characteristic of bacteria described in the study materials?

Accepted Answer

They have a nucleus.

Question 6

A sample contains cells that are connected end-to-end in a filament and are green in color. According to the dichotomous key, which group do these cells most likely belong to?

Accepted Answer

Volvox (green algae)

Question 7

Which of the following best explains why taxonomy is important in biology?

Accepted Answer

It provides a universal system for classifying and naming organisms, aiding communication and research.

Question 8

Which of the following organisms is classified in the Supergroup Excavata according to the study materials?

Accepted Answer

Euglena

Question 9

A student observes a microorganism that moves by extending pseudopodia and is covered with mucus. According to the dichotomous key, which organism is this most likely to be?

Accepted Answer

Amoeba

Question 10

Which of the following statements about green algae (Phylum Chlorophyta) is supported by the study materials?

Accepted Answer

Green algae can be unicellular, colonial, or filamentous, and contain chlorophyll.

Question 11

Which method is recommended for preparing a wet mount of living microorganisms for microscopic examination?

Accepted Answer

Place a drop of water and the specimen on a slide, then gently lower a coverslip over it.

Question 12

Which of the following is a correct application of the dichotomous key for identifying a microorganism that is spherical and forms colonies?

Accepted Answer

Go to Volvox

Question 13

Which of the following is a plausible reason why bacteria are found in both human bodies and the environment, as described in the study materials?

Accepted Answer

Bacteria are highly adaptable and can survive in diverse conditions due to their simple structure.

Question 14

A student is using a compound microscope to examine a slide at high power. If the FOV at scanning power is $$4 	ext{ mm}$$, and the FOV at high power is $$0.4 	ext{ mm}$$, what is the ratio of the scanning FOV to the high power FOV?

Accepted Answer

$$10:1$$

Question 15

Which of the following is a distinguishing feature of organisms in the Supergroup Unikonta, as described in the study materials?

Accepted Answer

They move using pseudopodia.

Question 16

Which of the following is the correct order of taxonomic ranks from most inclusive to least inclusive, based on the diagram in the study materials?

Accepted Answer

Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species

Question 17

Which of the following statements about the use of microscopes in examining microorganisms is accurate according to the study materials?

Accepted Answer

Compound microscopes allow for the examination of wet mounts of living microorganisms at high magnification.

Question 18

Which of the following is a correct comparison between Euglena and Amoeba based on their locomotion?

Accepted Answer

Euglena moves by whipping flagella, while Amoeba moves by extending pseudopodia.

Question 19

Which of the following is a correct step in the clean-up checklist for microscope use?

Accepted Answer

Return the microscope to the cabinet with the ocular lenses facing away from you.

Examining Microorganisms: Bacteria and Protists – Taxonomy, Diversity, and Microscopy

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