Chapter 13. 13·11–13·12 Archaea exploit some of the most extreme habitats.

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Instructions

Check your understanding of concepts from 13·11–13·12 Archaea exploit some of the most extreme habitats by answering the following questions.

1.

1. Which of the following statements about the archaeal genome is correct?

The archaeal genome has more in common with the bacterial genome than the eukaryotic genome.

The archaeal genome is primarily composed of genes that cannot be found in either of the other domains of life.

The archaeal genome is much smaller than any bacterial genome.

The archaeal genome is found within a nucleus.

None of the above statements about the archaeal genome is correct.

Correct. (See section 13·11 Archaea are profoundly different from bacteria.)

Incorrect. (See section 13·11 Archaea are profoundly different from bacteria.)

2.

2. Unlike other microbes, archaea are able to thrive:

in very extreme (with respect to temperature, salinity, pressure, etc.) environments.

in lakes and rivers (i.e., fresh water).

in all the same places that bacteria are found.

in the human body.

in well-aerated soils.

Correct. (See section 13·12 Archaea thrive in habitats too extreme for most other organisms.)

Incorrect. (See section 13·12 Archaea thrive in habitats too extreme for most other organisms.)

3.

3. Which statement is NOT true about archaeans?

Most of the known archaeans have been identified after growing them in a laboratory.

The polymerase chain reaction relies on an enzyme isolated from an archaean.

Microbes that metabolize toxic substances have enormous industrial potential.

It can be difficult to culture archaeans that require extreme conditions in order to grow.

Some scientists estimate that millions of archaea species are yet to be discovered.

Correct. (See section 13·12 Archaea thrive in habitats too extreme for most other organisms.)

Incorrect. (See section 13·12 Archaea thrive in habitats too extreme for most other organisms.)

4.

4. Which of the following is NOT a profound difference between bacteria and archaea?

the chemical composition of plasma membranes

chemical composition of cell walls

the chemical composition of flagella

differences in DNA sequences

the presence or absence of a nuclear membrane

Correct. (See section 13·11 Archaea are profoundly different from bacteria.)

Incorrect. (See section 13·11 Archaea are profoundly different from bacteria.)

5.

5. Bioengineers believe that extremophile ____________________ that thrive at high temperatures and pressures and metabolize toxic substances have enormous potential for industries that have to carry out activities under those conditions.

protists

bacteria

archaeans

All of the above are correct.

Only B and C are correct.

Correct. (See section 13·12 Archaea thrive in habitats too extreme for most other organisms.)

Incorrect. (See section 13·12 Archaea thrive in habitats too extreme for most other organisms.)

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