QUESTION 6 Some archaeans are extremophiles, such as those that survive very hig

Question

QUESTION 6

Some archaeans are extremophiles, such as those that survive very high temperatures or extremely salty conditions. An archaean that can survive a very low pH might be called a/n:

.

.

.   thermophile

.

.

.   alkalophile

.

.

.   acidophile

.

.

.   methanogen

.

.

.   halophile

   .  

QUESTION 7

Many protists such as dinoflagellates, stramenopiles, and euglenids contain plastids that have three or even four membranes, as well as DNA similar to that of cyanobacteria. A hypothesis that explains these characeristics is:

.

.

.   transformation

.

.

.   conjugation

.

.

.   binary fission

.

.

.   transduction

.

.

.   endosymbiosis

   .  

   

QUESTION 8

Suppose you are involved in research investigating the cause of an emergent disease that impairs the function of nervous tissue. You wish to begin by isolating the pathogen. To do this, you extract DNA and RNA from infected nervous tissue so you can determine whether the pathogen is closely related to any known pathogens. To your surprise, you find that the extracted DNA and RNA belong only to the host. Given this result, which of the following conclusions could you most appropriately make?

.

.

.   The disease may be caused by a prion.

.

.

.   The disease may be caused by a protist.

.

.

.   The disease may be caused by a fungus.

.

.

.   The disease may be caused by a virus.

.

.

.   The disease may be caused by a viroid.

   .  

QUESTION 10

Occasionally, bacterial DNA is transferred from one cell to another by a bacteriophage. This process is called:

.

.

.   transduction

.

.

.   replication

.

.

.   conjugation

.

.

.   transformation

.

.

.   binary fission

   .  

.

.

.   thermophile

.

.

.   alkalophile

.

.

.   acidophile

.

.

.   methanogen

.

.

.   halophile

Explanation / Answer

QUESTION 6

Acidophile- organisms which can stay at very low pH like 1 to 5.

QUESTION 7

Endsymbiosis

QUESTION 8

The disease may be caused by a prion.

A prion is made with proteins and they are known to be infectious agent.

QUESTION 10

transduction- in this process DNA from bacteria will pass from one bacteria to another by a virus which is called bacteriophage.

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