$$\text{Magnification} = \text{Objective lens} \times \text{Eyepiece lens}$$

Question 1

Which bacterial shape is represented by the term 'bacilli'?

Accepted Answer

Rod-shaped

Question 2

A Gram stain is used to distinguish between two types of bacterial cell wall designs. Which statement correctly describes Gram-positive bacteria?

Accepted Answer

They have a thick peptidoglycan layer and stain purple.

Question 3

Helicobacter pylori is clinically significant because it is known to cause which condition?

Accepted Answer

Ulcers

Question 4

Which bacterial structure is associated with increased virulence in pneumonia-causing strains of Staphylococcus?

Accepted Answer

Capsule

Question 5

Cyanobacteria are often found in colonies held together by a gelatinous matrix. What is the main component of this matrix?

Accepted Answer

Mucilage

Question 6

Which of the following is NOT a type of cyanobacteria?

Accepted Answer

Paramecium

Question 7

Plasmodium is a protist responsible for causing malaria. How is it transmitted to humans?

Accepted Answer

By mosquito bites

Question 8

Trypanosoma is responsible for African sleeping sickness. Which vector transmits this protist?

Accepted Answer

Tsetse fly

Question 9

Which supergroup do diatoms belong to?

Accepted Answer

SAR

Question 10

Which of the following organisms is classified under the supergroup Archaeplastida?

Accepted Answer

Volvox

Question 11

A student observes a protist with a true nucleus under the microscope. What does this indicate about the organism?

Accepted Answer

It is a eukaryote

Question 12

Which equation best represents the calculation of magnification in microscopy?

Accepted Answer

$$	ext{Magnification} = 	ext{Objective lens} 	imes 	ext{Eyepiece lens}$$

Question 13

Which of the following is a distinguishing feature of Gram-negative bacteria?

Accepted Answer

Thin peptidoglycan layer and stain pink/red

Question 14

Which protist is animal-like and moves using cilia?

Accepted Answer

Paramecium

Question 15

Which of the following is a common misconception about cyanobacteria?

Accepted Answer

They are eukaryotes

Question 16

A patient presents with symptoms of syphilis. Which bacterium is most likely responsible?

Accepted Answer

Treponema pallidum

Question 17

Which supergroup includes both brown algae and diatoms?

Accepted Answer

SAR

Question 18

Which organism is responsible for causing malaria and what is its supergroup classification?

Accepted Answer

Plasmodium; SAR

Question 19

Which of the following green algae is classified under Archaeplastida and forms filamentous colonies?

Accepted Answer

Spirogyra

Question 20

Which equation would you use to calculate the area of a circular diatom observed under the microscope, given its radius $$r$$?

Accepted Answer

$$A = \pi r^2$

Bacterial and Protist Diversity: Cell Structure, Classification, and Key Groups

Study Guide - Practice Questions