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