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BIOL 251 EXAM 1 |QUESTIONS AND 100% CORRECT WELL DETAILED ANSWERS|LATEST UPDATE!!!2025/2026|GUARANTEED PASS|GRADED A+

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BIOL 251 EXAM 1 |QUESTIONS AND 100% CORRECT WELL DETAILED ANSWERS|LATEST UPDATE!!!2025/2026|GUARANTEED PASS|GRADED A+

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CORRECT WELL DETAILED ANSWERS|LATEST
UPDATE!!!2025/2026|GUARANTEED

Define microbiology - ANSWER The study of microorganisms, how they work, interact
with the environment, and interact with us.



Bacteria, the largest and most important group of microorganisms.



List two emerging infections - ANSWER Tuberculosis

Hantavirus- mutation

Ebola

E. coli- in gut



Describe the impact of infectious disease on human deaths before the 1900, currently
worldwide and compared to the deaths from wars and natural disasters. -
ANSWER Before the 1900 50% of all children died of infectious disease before
reaching the age of 10.



Currently about 1/3 of deaths worldwide are due to infectious diseases.



Deaths from wars: 150 million have died of AIDS, TB and malaria alone since 1945 compared
with 23 million lost to wars



Natural disasters: 160 times more people have died from AIDS, malaria respiratory and
diarrhea diseases than in all natural disasters combined.



List the 6 groups of microorganisms - ANSWER -Fungi


1

, -Protozoa

-Algae

-Prokaryotes

-Helminths

-Virus



Fungi composed of - ANSWER Molds- multicellular, reproduced by sexual and asexual
spores

Yeasts- unicellular, reproduced asexually by budding, some produce sexual spores



List at least one disease caused by each type of microorganism

-Protozoa, helmiths, fungi, algae, prokaryotes, viruses - ANSWER *Fungi* - yeast
infection (Candidiasis), cryptococcosis, pneumocystis pneumonia

*Protozoa* - plasmodium (some can cause malaria-non-motile)

*Algae* - cholera (shellfish poisoning)

*Prokaryotes* - Tuberculosis

*Helminths* (worms) - tape worms

*Virus* - AIDS, influenze, West Nile, SARS



List different characteristics of each group of microorganisms - ANSWER Fungi-
Eukaryotic (have membane-bound nucleus). Obtain their food from other organisms.



Protozoa- single celled eukaryotes, most reproduce asexually some produce sexually,
classified by mechanism of motility.



Algae- Unicellular or multicellular. Photosynthetic. Simple reproductive structures. Non-
pathogenic except for their role in red tides and shellfish poisoning (ppl eating fish that eat
algae). Make worlds most oxygen as part of photosynthesis.




2

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