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Bacteria

Test Description: Please answer the review questions about bacteria.

Instructions: Answer all questions to get your test result.

1) Bacteria live in a variety of locations one of which is the human mouth. Which explanation supports the wide variety of bacteria in the mouth?

ACalcium in the teeth provides appropriate pH levels in the mouth. BSalivary glands cause mutations in populations of bacteria. CAccessibility to air cause bacteria to change form. DAccessibility to nutrients makes the mouth a favorable habitat.

2) Bacteria can thrive in many environments including hostile environments like hot springs, polar ice caps and salt flats. This is due to the __________ of bacteria.

Asmall sizes Bvaried shapes Cbiochemical diversity Dmeans of movement

3) Some bacteria, like those that cause Cholera, have a flagellum that allows them to

Areproduce Bmove Cexcrete water Dproduce sugar

4) What are bacterial chromosomes made up of?

Alinear pieces of DNA Bsingle circular piece of DNA CDNA paired in chromosomes DDNA or RNA in various forms

5) One way bacteria are important to the Earth and its ecosystems is that

Abacteria produce acetone. Bbacteria decompose dead organisms. Cbacteria concentrate valuable minerals. Dbacteria use oxygen.

6) Prokaryotes are different from all other organisms in that their cells

Ahave organelles Black DNA Clack nuclei Dhave cell walls

7) Bacteria that use chemicals, like sulfur, as an energy source are considered

Achemoautotrophs Bsaprobes Cheterotrophs Dphotoautotrophs

8) Which of these is an example of how bacteria are beneficial?

Aproduce billions of offspring per day Bcan survive in hot, acidic environments Creproduce sexually through conjugation Dbreak down cellulose in some animals' digestive systems

9) Environmental spills of petroleum are sometimes cleaned up by using

Abacteriophages Bviruses Cbacteria Dprotists

10) All bacteria are classified as

Aarchaea Bprotista Ceukaryotes Dprokaryotes

*select an answer for all questions

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