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