GCSE AQA Biology Combined Science Classification of Living Organisms: Scientists have removed microorg

Question

Scientists have removed microorganisms from inside rocks in caves in Mexico.

The microorganisms have been trapped there for between 10 000 and 50 000 years.

The caves are dark, very hot, humid and acidic.

Why are these microorganisms called extremophiles?  
Tick two boxes.

They are thousands of years old.  
They survive in high humidity.  
They survive in high temperatures.  
They survive in the dark.  
They survive inside rocks.  
They survive where it is acidic.

The microorganisms have been inactive for thousands of years but the scientists have reactivated them.

Figure 2 shows the results of enzyme activity on four enzymes, A, B, C and D.

Three of the enzymes were from microorganisms found in the soil near the caves.

One of the enzymes was from a reactivated microorganism from the caves.

Which enzyme comes from the microorganism from the caves?  
Tick one box.

A  
B  
C  
D

Give the reasons for your answer to question 03.2

Carl Woese developed the 'three-domain system' of classification.

Describe the 'three-domain system' of classification.

Most of the microorganisms from the caves were classified as belonging to the Archaea domain of the 'three-domain system'.

Suggest why.

Scientists have removed microorganisms from inside rocks in caves in Mexico - AQA - GCSE Biology Combined Science - Question 3 - 2018 - Paper 2

Worked Solution & Example Answer:Scientists have removed microorganisms from inside rocks in caves in Mexico - AQA - GCSE Biology Combined Science - Question 3 - 2018 - Paper 2

Why are these microorganisms called extremophiles?

Which enzyme comes from the microorganism from the caves?

Give the reasons for your answer to question 03.2

Describe the 'three-domain system' of classification.

Suggest why.

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