Question 1

Which of the following best explains why extreme halophiles are able to thrive in environments such as the pink lake shown in the first image?

Accepted Answer

They have unique membrane lipids and proteins that allow them to maintain osmotic balance in highly saline conditions.

Question 2

Which of the following is the correct order of the three most common prokaryotic cell shapes as shown in the second image?

Accepted Answer

Cocci, Bacilli, Spirilli

Question 3

Many antibiotics, as shown in the third and fourth images, target which structure in bacteria, and why does this make Gram-positive bacteria more susceptible?

Accepted Answer

The cell wall; Gram-positive bacteria have a thick peptidoglycan layer that is easily disrupted.

Question 4

Which adaptation allows some bacteria to survive extreme conditions for centuries, as shown in the fifth image?

Accepted Answer

Formation of endospores

Question 5

Fimbriae, as shown in the sixth image, primarily function to:

Accepted Answer

Allow bacteria to adhere to surfaces and each other

Question 6

Which of the following best describes the function of the specialized membranes seen in aerobic and photosynthetic prokaryotes (seventh image)?

Accepted Answer

They increase surface area for metabolic processes such as cellular respiration and photosynthesis.

Question 7

In the eighth image, what is the function of plasmids in prokaryotes?

Accepted Answer

They encode genes that may provide advantages such as antibiotic resistance.

Question 8

The process shown in the ninth image, where a pilus connects two bacterial cells, is an example of:

Accepted Answer

Conjugation

Question 9

In the cyanobacterium Anabaena (tenth image), what is the role of heterocysts?

Accepted Answer

They fix atmospheric nitrogen into ammonia.

Question 10

Dental plaque, as shown in the eleventh image, is an example of which prokaryotic adaptation?

Accepted Answer

Biofilm formation

Question 11

Which of the following is NOT a subgroup of Proteobacteria, as shown in the twelfth image?

Accepted Answer

Zeta

Question 12

Rhizobium, shown in the thirteenth image, is important in agriculture because it:

Accepted Answer

Fixes atmospheric nitrogen in root nodules of legumes

Question 13

Which metabolic category best describes Nitrosomonas (fourteenth image), which converts $NH_4^+$ to $NO_2^-$?

Accepted Answer

Chemoautotroph

Question 14

Thiomargarita namibiensis (fifteenth image) is notable for which metabolic process?

Accepted Answer

Sulfur oxidation

Question 15

Which of the following statements about the Delta subgroup of Proteobacteria (sixteenth image) is correct?

Accepted Answer

They include myxobacteria that form drought-resistant fruiting bodies.

Question 16

Helicobacter pylori (seventeenth image) is associated with which human disease?

Accepted Answer

Stomach ulcers

Question 17

Which of the following is true about Chlamydia (eighteenth image)?

Accepted Answer

They are obligate intracellular parasites of animal cells.

Question 18

Spirochetes (nineteenth image) are notable for causing which of the following diseases?

Accepted Answer

Syphilis and Lyme disease

Question 19

Which of the following statements about cyanobacteria (twentieth image) is correct?

Accepted Answer

They are photoautotrophs that generate oxygen.

Question 20

Which of the following is a unique feature of Archaea compared to Bacteria, as shown in the twenty-second image?

Accepted Answer

Some branched hydrocarbons in membrane lipids

Study Guide: Bacteria and Archaea (Chapter 27)

Study Guide - Practice Questions

Study Guide - Flashcards