General Microbiology
General Microbiology Midterm Exam 1 Spring 2026
100% Guaranteed Pass | Complete A+ Guide
This Document Contains:
❖General Microbiology
❖Midterm Exam 1 Spring 2026
❖Questions With Correct Answers
❖100% Guaranteed Pass
❖Complete A+ Guide
PASS 100% GUARANTEED
This study source was downloaded by 100000900823938 from CourseHero.com on 01-26-2026 19:09:24 GMT -06:00
https://www.coursehero.com/file/228907563/General-Microbiology-Midterm-Exam-1-Key-ID-Adocx/
, General Microbiology Midterm Exam 1 Spring 2026 Key
ID = A
Read each question carefully and determine exactly what is being asked. Occasionally more
than one answer might be technically correct. Choose the BEST answer.
1) Which of the following statements is FALSE about the first living organisms on Earth?
a. The first living organisms were likely simple single-celled microorganisms like
bacteria.
b. The total number of bacterial cells on Earth is estimated to be 10^20.
c. Less than 0.0001% of microbial species are known to science.
d. The human microbiome contains about 3 million genes, far more than the 21,000 in
the human genome.
e. There are more bacterial cells in and on the human body than human cells.
2) Which of the following is the earliest undisputed evidence of life on Earth?
a. Banded iron formations
b. Biologically fractionated graphite inside zircon crystals
c. Kerogen hydrocarbons
d. Microfossils
e. Microbial mats on land
3) Which molecules were likely abundant in a weakly reducing early atmosphere?
a. CO2
b. NH3
c. CH3
d. H2S
e. O2
4) The idea iron sulfide crystals can catalyze and produce the energy required
to polymerize nucleic acids is known as the Iron-Sulfur Theory .
a. protein synthesis
b. enzymatic reactions
c. redox reactions
d. catalytic reactions
e. anabolic reactions
5) Which of the following molecules can both self-replicate and catalyze peptide bonds
a. RNA polymerases
b. Ribozymes
c. Protomerases
d. Peptidases
e. Nucleases
6) Which of the following was mentioned in class as a major product of the reverse citric acid
cycle?
a. O2
b. Glucose
c. Pyruvate
d. Acetate
e. NADPH
This study source was downloaded by 100000900823938 from CourseHero.com on 01-26-2026 19:09:24 GMT -06:00
https://www.coursehero.com/file/228907563/General-Microbiology-Midterm-Exam-1-Key-ID-Adocx/
General Microbiology Midterm Exam 1 Spring 2026
100% Guaranteed Pass | Complete A+ Guide
This Document Contains:
❖General Microbiology
❖Midterm Exam 1 Spring 2026
❖Questions With Correct Answers
❖100% Guaranteed Pass
❖Complete A+ Guide
PASS 100% GUARANTEED
This study source was downloaded by 100000900823938 from CourseHero.com on 01-26-2026 19:09:24 GMT -06:00
https://www.coursehero.com/file/228907563/General-Microbiology-Midterm-Exam-1-Key-ID-Adocx/
, General Microbiology Midterm Exam 1 Spring 2026 Key
ID = A
Read each question carefully and determine exactly what is being asked. Occasionally more
than one answer might be technically correct. Choose the BEST answer.
1) Which of the following statements is FALSE about the first living organisms on Earth?
a. The first living organisms were likely simple single-celled microorganisms like
bacteria.
b. The total number of bacterial cells on Earth is estimated to be 10^20.
c. Less than 0.0001% of microbial species are known to science.
d. The human microbiome contains about 3 million genes, far more than the 21,000 in
the human genome.
e. There are more bacterial cells in and on the human body than human cells.
2) Which of the following is the earliest undisputed evidence of life on Earth?
a. Banded iron formations
b. Biologically fractionated graphite inside zircon crystals
c. Kerogen hydrocarbons
d. Microfossils
e. Microbial mats on land
3) Which molecules were likely abundant in a weakly reducing early atmosphere?
a. CO2
b. NH3
c. CH3
d. H2S
e. O2
4) The idea iron sulfide crystals can catalyze and produce the energy required
to polymerize nucleic acids is known as the Iron-Sulfur Theory .
a. protein synthesis
b. enzymatic reactions
c. redox reactions
d. catalytic reactions
e. anabolic reactions
5) Which of the following molecules can both self-replicate and catalyze peptide bonds
a. RNA polymerases
b. Ribozymes
c. Protomerases
d. Peptidases
e. Nucleases
6) Which of the following was mentioned in class as a major product of the reverse citric acid
cycle?
a. O2
b. Glucose
c. Pyruvate
d. Acetate
e. NADPH
This study source was downloaded by 100000900823938 from CourseHero.com on 01-26-2026 19:09:24 GMT -06:00
https://www.coursehero.com/file/228907563/General-Microbiology-Midterm-Exam-1-Key-ID-Adocx/
