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Name ______________________________ Class ___________________ Date __________________
Skills Worksheet
Directed Reading A
Section: Bacteria and Archaea
_____ 1. How many domains of living things are there?
a. one
b. two
c. three
d. four
_____ 2. The oldest forms of life on Earth are in the domains
a. Bacteria and Archaea.
b. Bacteria and Eukarya.
c. Eukarya and Archaea.
d. Bacteria and Fungi.
SOME CHARACTERISTICS OF BACTERIA AND ARCHAEA
_____ 3. Bacteria are usually
a. rod shaped, spherical, or spiral shaped.
b. rod shaped, spherical, or cone shaped.
c. rod shaped, pyramidal, or spherical.
d. cube shaped, spherical, or spiral shaped.
_____ 4. What gives bacteria their shape?
a. their size
b. their environment
c. their color
d. their cell wall
Match the correct description with the correct term. Write the letter in the
space provided.
_____ 5. rod shaped bacteria, with a large surface
area to take in nutrients
_____ 6. long, spiral shaped bacteria, with
flagella at both ends to move like a
corkscrew
a. cocci
b. bacilli
c. spirilla
_____ 7. spherical, they do not dry out as quickly
as other bacteria
8. Hairlike parts that spin to push a bacterium through water or other liquids are
called ______________________
Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.
Holt Science and Technology
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Bacteria and Viruses
Name ______________________________ Class ___________________ Date __________________
Directed Reading A continued
9. An organism that consists of a single cell that does not have a nucleus is called
a .______________________
10. Cells with a nucleus are called ______________________.
11. What are three ways that prokaryotes are like eukaryotes?
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
12. What are three ways that prokaryotes function differently from eukaryotes?
_______________________________________________________________
_______________________________________________________________
_________________________________________ ______________________
13. Asexual reproduction in a single-celled organism by which one cell divides
into two single-celled organisms is called .______________________
14. What are the four steps of reproduction by binary fission?
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
15. A thick-walled protective spore that forms inside a bacterial cell and resists
harsh conditions is called a(n) .______________________
16. What may happen to endospores when conditions improve in areas that have
been hot, cold, or very dry?
_______________________________________________________________
_______________________________________________________________
THE DOMAIN BACTERIA
_____ 17. Most known prokaryotes are
a. archaea.
b. protista.
c. fungi.
d. bacteria.
Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.
Holt Science and Technology
2
Bacteria and Viruses
Name ______________________________ Class ___________________ Date __________________
Directed Reading A continued
_____ 18. The domain that has more individuals than all other domains combined
is
a. Fungi.
b. Archaea.
c. Bacteria.
d. Eukarya.
_____ 19. Most bacteria are
a. consumers.
b. producers.
c. decomposers.
d. scavengers.
Match the correct description with the correct term. Write the letter in the
space provided.
_____ 20. bacteria that feed on dead organisms
a. producers
_____ 21. bacteria that eat other organisms, or live in
or on the body of another
b. decomposers
c. consumers
_____ 22. bacteria that use energy from sunlight to
make their own food
23. Producer bacteria that contain the green pigment chlorophyll are called
______________________
24. What are two effects of pigments found in cyanobacteria?
_______________________________________________________________
_______________________________________________________________
25. How do some scientists believe bacteria similar to cyanobacteria helped give
rise to the first plants on Earth, billions of years ago?
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.
Holt Science and Technology
3
Bacteria and Viruses
Name ______________________________ Class ___________________ Date __________________
Directed Reading A continued
THE DOMAIN ARCHAEA
Match the correct description with the correct term. Write the letter in the space
provided.
_____ 26. archaea that live in ocean vents and hot
springs, at temperatures between 60 C
and 80 C
_____ 27. archaea that live in salty environments,
such as the Dead Sea and Great Salt
Lake
a. salt lovers
b. methane makers
c. heat lovers
_____ 28. archaea that live in swamps and animal
intestines
29. What kind of environment do archaea prefer?
_______________________________________________________________
30. What are three extreme environments where archaea have been found?
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
31. What is one difference between the cells of archaea and the cells of bacteria?
_______________________________________________________________
_______________________________________________________________
Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.
Holt Science and Technology
4
Bacteria and Viruses