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Bacteria

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What phylum are the "Sun Animalicules" in?
a. Heliozoa
b. Actinopoda
c. Acanthocephala
d. Amoeba

Radiolarians are most kin to the:
a. heliozoa
b. amebas
c. paramecia
d. rotifers

Which type of diatom can move the best?
a. centrates
b. pennates
c. helical
d. rhombus

What are food vacuoles used for?
a. capture food
b. digest food
c. transport food
d. excrete waste

What do ciliates use for water balance?
a. food vacuoles
b. contractile vacuoles
c. nucleus
d. cell membrane

How are rotifer spores transported?
a. water
b. wind
c. soil
d. animals

Some rotifers feed on bacteria.
a. True
b. False

Bacteria are the simplest and oldest lifeforms.
a. True
b. False

All ciliates are microscopic.
a. True
b. False

Diatoms, like many beautiful creatures, are very rare life-forms.
a. True
b. False

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Solution Summary

For multiple choice questions related to bacteria, this solution provides the best answer, a brief explanation of why it the best answer and then provides the reference as well.

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Recombination in bacteria and in viruses that infect bacteria.

Four E. coli strains of genotype a+ b- are labeled 1,2,3 and 4. Four strains of genotype a- b+ are labeled 5,6,7, and 8. The two genotypes are mixed in all possible combinations and (after incubation) plated to determine the frequency of a+ b+ recombinants. The following results were obtained, where M = many recombinants, L = low numbers of recombinants, and O = no recombinants.

-----1----2----3---4
----------------------
5--O-M--M--O
6--O---M--M--O
7--L----O--O--M
8--O---L-L---O

On the basis of these results, assign a sex type (either Hfr, F+, or F-) to each of the strains.

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