question Which process involves the conversion of atmospheric nitrogen into ammonia

Microbiology

Which process involves the conversion of atmospheric nitrogen into ammonia?

A. Nitrogen fixation
B. Nitrification
C. Denitrification
D. Ammonification

Nitrogen fixation is the process by which atmospheric nitrogen is converted into ammonia by nitrogen-fixing bacteria.

Which microorganism is used in the production of yogurt?

A. Lactobacillus
B. Salmonella
C. Pseudomonas aeruginosa
D. Clostridium botulinum

Which of the following diseases is caused by a protozoan?

A. Malaria
B. Tuberculosis
C. Influenza
D. Lyme disease

Which microorganism is used in the production of antibiotics such as erythromycin?

A. Saccharopolyspora erythraea
B. Bacillus anthracis
C. Pseudomonas aeruginosa
D. Escherichia coli (E. coli)

What is the primary role of microorganisms in the sulfur cycle?

A. Conversion of sulfur between different forms
B. Nitrogen fixation
C. Photosynthesis
D. Cellular respiration

What is the primary mode of transmission of the influenza virus?

A. Respiratory droplets
B. Contaminated water
C. Vector (e.g., mosquito)
D. Sexual contact

Which microorganism is responsible for the production of citric acid in the citric acid cycle (Krebs cycle)?

A. Acetobacter aceti
B. Saccharomyces cerevisiae (brewer's yeast)
C. Aspergillus niger
D. Escherichia coli (E. coli)

Which microorganism is responsible for the production of lactic acid in fermentation?

A. Lactobacillus
B. Saccharomyces cerevisiae (brewer's yeast)
C. Clostridium butyricum
D. Escherichia coli (E. coli)

What is the primary mode of nutrition in fungi?

A. Heterotrophic
B. Autotrophic
C. Mixotrophic
D. Parasitic

Which of the following is an example of a Gram-negative bacterium?

A. Escherichia coli (E. coli)
B. Staphylococcus aureus
C. Bacillus subtilis
D. Clostridium difficile

What is the primary role of viruses in microbiology?

A. Infecting host cells and replicating
B. Decomposing organic matter
C. Producing antibiotics
D. Facilitating nutrient absorption