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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?
A
Accessibility to air cause bacteria to change form.
B
Salivary glands cause mutations in populations of bacteria.
C
Accessibility to nutrients makes the mouth a favorable habitat.
D
Calcium in the teeth provides appropriate pH levels in the mouth.
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.
A
biochemical diversity
B
means of movement
C
varied shapes
D
small sizes
3) Some bacteria, like those that cause Cholera, have a flagellum that allows them to
A
move
B
reproduce
C
produce sugar
D
excrete water
4) What are bacterial chromosomes made up of?
A
DNA paired in chromosomes
B
single circular piece of DNA
C
linear pieces of DNA
D
DNA or RNA in various forms
5) One way bacteria are important to the Earth and its ecosystems is that
A
bacteria use oxygen.
B
bacteria decompose dead organisms.
C
bacteria concentrate valuable minerals.
D
bacteria produce acetone.
6) Prokaryotes are different from all other organisms in that their cells
A
have organelles
B
lack DNA
C
lack nuclei
D
have cell walls
7) Bacteria that use chemicals, like sulfur, as an energy source are considered
A
photoautotrophs
B
heterotrophs
C
chemoautotrophs
D
saprobes
8) Which of these is an example of how bacteria are beneficial?
A
break down cellulose in some animals' digestive systems
B
produce billions of offspring per day
C
can survive in hot, acidic environments
D
reproduce sexually through conjugation
9) Environmental spills of petroleum are sometimes cleaned up by using
A
bacteria
B
protists
C
bacteriophages
D
viruses
10) All bacteria are classified as
A
protista
B
archaea
C
eukaryotes
D
prokaryotes
*select an answer for all questions
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