7.2 Bacterial Classification

Question 1

Bacteria are classified into how many major groups based on genetic similarities?
a) 2
b) 5
c) 8
d) 10

Answer 1

b

Question 2

What is the main characteristic used to differentiate Gram-positive and Gram-negative bacteria?
a) Cell size
b) Flagella presence
c) Cell wall structure
d) Nucleus structure

Answer 2

c

Question 3

Which bacterial group is known for its wavy, spiral structure?
a) Proteobacteria
b) Spirochetes
c) Chlamydias
d) Cyanobacteria

Answer 3

c

Question 4

Cyanobacteria are often referred to as:
a) Red algae
b) Blue-green algae
c) Brown algae
d) Green algae

Answer 4

b

Question 5

What is the primary characteristic that distinguishes Green Sulfur Bacteria?
a) Aerobic phototrophy
b) Production of oxygen during photosynthesis
c) Utilization of sulfide or sulfur for photosynthesis
d) Lack of chlorosomes in their cells

Answer 5

c

Question 6

What is the primary function of the carboxysome in cyanobacteria?
a) Photosynthesis
b) Nitrogen fixation
c) Carbon dioxide fixation
d) Oxygen production

Answer 6

c

Question 7

Which bacterial group includes species capable of causing diarrhea in humans?
a) Alpha Proteobacteria
b) Beta Proteobacteria
c) Gamma Proteobacteria
d) Delta Proteobacteria

Answer 7

c

Question 8

Gram-positive bacteria have a cell wall composed mainly of:
a) Peptidoglycan
b) Lipopolysaccharides
c) Cellulose
d) Chitin

Answer 8

a

Question 9

What is a unique characteristic of spirochetes?
a) Flagella located outside the cellular body
b) Lack of flagella
c) Flagella located in the periplasm
d) Flagella used for external fluid interaction

Answer 9

c

Question 10

What is the smallest group of Proteobacteria?
a) Alpha Proteobacteria
b) Beta Proteobacteria
c) Gamma Proteobacteria
d) Epsilon Proteobacteria

Answer 10

d

Question 11

What is the characteristic shape of bacteria that are classified as cocci?
a) Rods
b) Spirals
c) Spheres
d) Cubes

Answer 11

c

Question 12

Which bacterial group is intracellular obligate parasites of animals and humans?
a) Proteobacteria
b) Chlamydias
c) Spirochetes
d) Cyanobacteria

Answer 12

b

Question 13

Which bacterial group is characterized by the absence of nuclei and membrane-bound organelles?
a) Archaea
b) Eukaryotes
c) Prokaryotes
d) Viruses

Answer 13

c

Question 14

What is the name of the unique cellular envelope found in thermophilic bacteria known as Thermotogae?
a) Capsule
b) Toga
c) Coccus
d) Peptidoglycan

Answer 14

b

Question 15

Which bacterial group includes species that are often used as vectors in genetic engineering?
a) Alpha Proteobacteria
b) Beta Proteobacteria
c) Gamma Proteobacteria
d) Delta Proteobacteria

Answer 15

a

Question 16

What bacterial group is widely studied for its potential use in biofuel production?
a) Chlamydias
b) Spirochetes
c) Cyanobacteria
d) Gram-positive bacteria

Answer 16

c

Question 17

Which bacterial group is found in the gastrointestinal tract of humans and animals, forming mutualistic relationships with hosts?
a) Bacteroidetes
b) Thermotogae
c) Green Sulfur Bacteria
d) Green Non-Sulfur Bacteria

Answer 17

a

Question 18

What is the primary pigment used by green sulfur bacteria for photosynthesis?
a) Chlorophyll
b) Bacteriochlorophyll
c) Phycoerythrin
d) Phycocyanin

Answer 18

b

Question 19

Which bacterial group is characterized by its ability to fix nitrogen?
a) Alpha Proteobacteria
b) Beta Proteobacteria
c) Gamma Proteobacteria
d) Cyanobacteria

Answer 19

d

Question 20

What is the function of the light-trapping organelles called chlorosomes in green sulfur bacteria?
a) Oxygen production
b) Carbon dioxide fixation
c) Photosynthesis using sulfide or sulfur
d) Locomotion

Answer 20

c

Question 21

What is the function of the light-trapping organelles called chlorosomes in green sulfur bacteria?
a) Oxygen production
b) Carbon dioxide fixation
c) Photosynthesis using sulfide or sulfur
d) Locomotion

Answer 21

c

Question 22

What is the main characteristic of green non-sulfur bacteria that distinguishes them from green sulfur bacteria?
a) Type of electron acceptor used in photosynthesis
b) Presence of flagella
c) Gliding motion for locomotion
d) Ability to produce oxygen during photosynthesis

Answer 22

c

Question 23

Which bacterial group is known for its spiral or curve-shaped members that are pathogenic to animals and humans?
a) Alpha Proteobacteria
b) Beta Proteobacteria
c) Gamma Proteobacteria
d) Epsilon Proteobacteria

Answer 23

d

Question 24

What is the primary structure of the cell wall in Gram-positive bacteria?
a) Outer membrane
b) Peptidoglycan layer
c) Lipopolysaccharides
d) Cellulose

Answer 24

b

Question 25

What is the characteristic arrangement of cocci in Streptococcus bacteria?
a) Pairs
b) Chains
c) Packets of four
d) Irregular clusters

Answer 25

b

Question 26

What is the primary function of Gram-positive bacteria’s exposed peptidoglycan layer?
a) Oxygen production
b) Carbon dioxide fixation
c) Nitrogen fixation
d) Easily penetrated by antibiotics

Answer 26

d

Question 27

Which bacterial group is characterized by the absence of flagella for locomotion but can move through a gliding motion?
a) Thermotogae
b) Green Sulfur Bacteria
c) Green Non-Sulfur Bacteria
d) Bacteroidetes

Answer 27

c

Question 28

What is a unique characteristic of Green Sulfur Bacteria?
a) Aerobic phototrophy
b) Production of oxygen during photosynthesis
c) Utilization of sulfide or sulfur for photosynthesis
d) Lack of chlorosomes in their cells

Answer 28

c