bio 152 Questions and Answers 2025 | Exam Preparation
s
1. The endosymbiont theory proposes that chloroplasts evolved from: early photosynthetic bacteria engulfed by
early eukaryotic cells
2. When did the Earth form?: Approximately 4.5 BYA
3. Which of the following organisms can fix atmospheric N2 gas into useable forms of nitrogen?: Cyanobacteria
4. All bacterial cells in a biofilm have the same phenotype. true or false?: False
5. Agrobacterium does which of the following:
a. It fixes nitrogen
b. It transfers DNA into plant cells
c. It performs oxygenic photosynthesis
d. It digests cellulose: b. it transfers DNA into plant cells
6. Which organisms are considered responsible for the oxygenation of the atmosphere, approximately 2.5
billion years ago?
A. photosynthetic archaea
B. photosynthetic bacteria
C. algae
D. photosynthetic eukaryotes: B. photosynthetic bacteria
7. Consider a bacterium called Agrobacterium tumefaciens. What is represent- ed by the two components of this
name?: Agrobacterium is the name of the genus
tumefaciens is the name of the species
8. According to the phylogenetic tree, the main domains of life are:: Bacteria, Archaea, and Eukaryotes
9. When did the first life appear on Earth?: 3.5 billion years ago
10.Which domain dominates the tree of life?
A. Archaea
B. Bacteria
C. Eukaryotes
D. Prokaryotes: B. Bacteria
11.What is proposed to be the earliest form of life?
A. DNA surrounded by proteins
B. DNA surrounded by lipids
C. RNA surrounded by lipids
D. RNA surrounded by proteins: C. RNA surrounded by lipids
12.Which of the following bacteria can form endospores? (more than 1)
, bio 152 Questions and Answers 2025 | Exam Preparation
s
A. Cyanobacteria
B. Bacillus thuringiensis
, bio 152 Questions and Answers 2025 | Exam Preparation
s
C. Agrobacterium tumefaciens
D. Clostridium difficile: B & D
13.If you discovered an Archaea with a monolayer, where would you predict it to live?
A. It would live in your gastrointestinal tract
B. It would live in high salt conditions
C. It would live in anaerobic conditions
D. It would live in high-temperature conditions: D. It would live in high-tempera- ture conditions
14.Peptidoglycan is found in which domain?
A. Archaea
B. Bacteria
C. Prokaryotes
D. Fungi
E. Eukaryotes: B. Bacteria
15.Why do Gram-positive cells appear purple after the Gram stain is complet- ed?
A. The outer membrane in Gram-negative cells prevents the crystal violet from entering
B. The thin layer of peptidoglycan retains the crystal violet
C. The outer membrane of Gram-positive cells retains the crystal violet
D. The thick layer of peptidoglycan in Gram-positive cells retains the crystal violet: D. The thick layer of
peptidoglycan in Gram positive cells retains the crystal violet
16.Mitochondria and chloroplasts have their own chromosomes consisting of:
A. linear RNA
B. circular RNA
C. linear DNA
D. circular DNA: D. circular DNA
17.Which cell envelope composition is found in Gram-positive bacteria?
A. Plasma membrane - peptidoglycan layer
B. Plasma membrane - outer membrane
C. Plasma membrane - peptidoglycan layer - outer membrane
D. Plasma membrane - peptidoglycan - outer membrane - capsule: A. Plasma membrane - peptidoglycan layer
s
1. The endosymbiont theory proposes that chloroplasts evolved from: early photosynthetic bacteria engulfed by
early eukaryotic cells
2. When did the Earth form?: Approximately 4.5 BYA
3. Which of the following organisms can fix atmospheric N2 gas into useable forms of nitrogen?: Cyanobacteria
4. All bacterial cells in a biofilm have the same phenotype. true or false?: False
5. Agrobacterium does which of the following:
a. It fixes nitrogen
b. It transfers DNA into plant cells
c. It performs oxygenic photosynthesis
d. It digests cellulose: b. it transfers DNA into plant cells
6. Which organisms are considered responsible for the oxygenation of the atmosphere, approximately 2.5
billion years ago?
A. photosynthetic archaea
B. photosynthetic bacteria
C. algae
D. photosynthetic eukaryotes: B. photosynthetic bacteria
7. Consider a bacterium called Agrobacterium tumefaciens. What is represent- ed by the two components of this
name?: Agrobacterium is the name of the genus
tumefaciens is the name of the species
8. According to the phylogenetic tree, the main domains of life are:: Bacteria, Archaea, and Eukaryotes
9. When did the first life appear on Earth?: 3.5 billion years ago
10.Which domain dominates the tree of life?
A. Archaea
B. Bacteria
C. Eukaryotes
D. Prokaryotes: B. Bacteria
11.What is proposed to be the earliest form of life?
A. DNA surrounded by proteins
B. DNA surrounded by lipids
C. RNA surrounded by lipids
D. RNA surrounded by proteins: C. RNA surrounded by lipids
12.Which of the following bacteria can form endospores? (more than 1)
, bio 152 Questions and Answers 2025 | Exam Preparation
s
A. Cyanobacteria
B. Bacillus thuringiensis
, bio 152 Questions and Answers 2025 | Exam Preparation
s
C. Agrobacterium tumefaciens
D. Clostridium difficile: B & D
13.If you discovered an Archaea with a monolayer, where would you predict it to live?
A. It would live in your gastrointestinal tract
B. It would live in high salt conditions
C. It would live in anaerobic conditions
D. It would live in high-temperature conditions: D. It would live in high-tempera- ture conditions
14.Peptidoglycan is found in which domain?
A. Archaea
B. Bacteria
C. Prokaryotes
D. Fungi
E. Eukaryotes: B. Bacteria
15.Why do Gram-positive cells appear purple after the Gram stain is complet- ed?
A. The outer membrane in Gram-negative cells prevents the crystal violet from entering
B. The thin layer of peptidoglycan retains the crystal violet
C. The outer membrane of Gram-positive cells retains the crystal violet
D. The thick layer of peptidoglycan in Gram-positive cells retains the crystal violet: D. The thick layer of
peptidoglycan in Gram positive cells retains the crystal violet
16.Mitochondria and chloroplasts have their own chromosomes consisting of:
A. linear RNA
B. circular RNA
C. linear DNA
D. circular DNA: D. circular DNA
17.Which cell envelope composition is found in Gram-positive bacteria?
A. Plasma membrane - peptidoglycan layer
B. Plasma membrane - outer membrane
C. Plasma membrane - peptidoglycan layer - outer membrane
D. Plasma membrane - peptidoglycan - outer membrane - capsule: A. Plasma membrane - peptidoglycan layer
