BIO 250 MICROBIOLOGY FINAL EXAM 60 QUESTIONS AND

BIO 250 MICROBIOLOGY FINAL EXAM 60 QUESTIONS AND

CORRECT ANSWERS 2024

• What microbial process was responsible for changing Earth's atmosphere from one without

oxygen to one with oxygen?Oxygenic photosynthesis

• In the nitrogen cycle, which of the following phases involves the release of Nitrogen into the

Earth's atmosphere?

Denitrification

• Farmers commonly inoculate legume crops with Rhizobium bacteria for which of the following

purposes?

The two form a symbiotic relationship increasing the plant's access to nitrogen.

• In the secondary phase of wastewater treatment, why is air injected into the sludge as it is

stirred and recirculated?

The bioremediators need oxygen

• Which of the following microorganisms is used to make yogurt?

Lactobacillus bulgaricus

• ATP is a

Nucleotide that releases and stores energy in the cell

• A viral capsid is composed

of Proteins

• Which of these are NOT considered living

organisms? Viruses

• Which of the following describes the order in which different types of RNA are involved

in translation?Messenger RNA (mRNA), transfer RNA (tRNA), ribosomal RNA (rRNA)

• What is the bacterial identification technique that, when positive, results in the bacterium

staining two contrasting colors?

Gram staining

• Which of the following is found in some, but not all groups of eukaryotic microorganisms?

Cell wall 1 / 2

• In which instance would a researcher need to use Bergey's Manual of Systematic Bacteriology

instead of Bergey's Manual of Determinative Bacteriology?To investigate the genetic history of a bacterial species

• Which of the following structures is found in gram-negative bacteria but is absent from gram-

positive bacteria?

Outer lipid membrane

• Which type of archaea is able to survive in extremely high concentrations of salt?

Halophiles

• Which of the following is true of prokaryotes, but not true of eukaryotes?

They have cell walls made of peptidoglycan

• Which of the following is the role of ribosomes?

Provide a site for protein synthesis

• Which of the following are theorized to be the ancestors of chloroplasts?

Cyanobacteria

• Which eukaryotic microorganisms are photoautotrophs?

Algae

• Describe the genetic material that is contained within a virus.

RNA or DNA, but not both

• In the life cycle of an animal virus, what occurs during adsorption?

The virus attaches to receptor sites outside the host cell.

• Which of the following viral enzymes converts viral RNA into

DNA? Reverse transcriptase

• A bacteriophage is what type of microorganism?

Virus

• What is the key function of a microbe's cell membrane, also known as the cytoplasmic

membrane?It transports nutrients in and wastes out

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