Portage Learning MICRO 100 microbiology EXAM A+ GRADE ASSURED COMPLETE SOLUTIONS AND VERIFIED ANSWERS

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Exam Solution
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Microbiology Exam 1 SPC 2026 A+ GRADE ASSURED CO vc vc vc vc vc vc vc vc




MPLETE SOLUTIONS AND VERIFIED ANSWERS (6A2F8)
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QUESTION 1 vc




Microorganism examples vc




ANSWER

Bacteria, algae, protozoa, helminths
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QUESTION 2 vc




Viruses are vc




ANSWER

parasitic, protein- vc



coated genetic elements, dependent on their infected host, and connected with the evolution of microbe
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s and humans
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QUESTION 3 vc




Factors impacting study of microorganisms:
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ANSWER

Reproduce rapidly, can be quickly grown in large populations in the laboratory, can't be seen directly, m
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icroscopes and other indirect means are used to study them.
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QUESTION 4 vc




Bacterial-type organisms have been on the planet for about:
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ANSWER

3.5 billion years Only living inhabitants for about 2 billion years. Prokaryotes have no true nucleus (pre-
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nucleus).

,QUESTION 5 vc




Eukaryotic organisms arose about: vc vc vc




ANSWER

1.8 billion years ago. Eu-
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kary means true nucleus. Precursors to the organisms that eventually formed multicellular animals.
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QUESTION 6 vc




Microbes and ubiquitous vc vc




ANSWER

Found in Earth's crust, polar ice caps, oceans, and the bodies of plants and animals. Occur in large numb
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ers. Live in places where other organisms cannot survive. Good bacteria exist.
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QUESTION 7 vc




How microbes shape out planet
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ANSWER

Microbes are the main forces that drive the structure and content the soil, water, and atmosphere. Prod
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uce gases such as CO2, NO, and CH3 that regulate the temp of earth. The enormous underground comm
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unity of microbes influence weathering, mineral extraction, and soil formation. Bacteria and fungi live in
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close associations with plants that help them obtain nutrients and protect them against disease.
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QUESTION 8 vc




Human uses for microbes in history vc vc vc vc vc




ANSWER

Bread, alcohol, cheese production, treatment of wounds and lesions, mining precious metals, clean up of
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human-created contamination.
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QUESTION 9 vc




Pathogens
ANSWER

Microbes that cause disease. WHO estimates that there are 10 billion new infections caused every year
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by microbes. Infections diseases are among the most common cause of death in US and worldwide. The
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death toll from infectious diseases is approximately 13 million ppl/year. CDC reports that a child dies fr
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om malaria every 30 seconds.
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, QUESTION 10 vc




Microbial causes for once thought to be noninfectious diseases:
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ANSWER

Gastric ulcers- Helicobacter pylori Diabetes- Coxsackievirus Schizophrenia-
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born agent Chronic infections with bacteria or viruses have been linked to multiple sclerosis, OCD, coro
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nary artery disease, and obesity.
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QUESTION 11 vc




Spontaneous generation theory vc vc




ANSWER

The belief that invisible vital forces present in matter led to the creation of life. Even after the discovery
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of microbes the theory of abiogenesis was still embraced by some. Others advocated biogenesis, saying
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that living things only arise from theres of their same kind.
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QUESTION 12 vc




Pasteur's Swan Neck Flask Experiment vc vc vc vc




ANSWER

helped to prove that microbes can be airborne, and live cannot be created from nothing.
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QUESTION 13 vc




Robert Hooke vc




ANSWER

1660s, used simple magnifying glass to study household objects/specimens.
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QUESTION 14 vc




Leeuwenhoek
ANSWER

manufactured simple microscopes to see the threads in fabrics. Observed "animalcules" in drops of rain
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water and other samples. Constructed over 250 small microscopes that could magnify up to 300x.
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QUESTION 15 vc