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Why were tubes 1 and 2 included in the experiment? Tubes 1 and 2 are the control group to which other tubes can be compared - VCE - SSCE Biology - Question 5 - 2005 - Paper 1
Question 5
Why were tubes 1 and 2 included in the experiment? Tubes 1 and 2 are the control group to which other tubes can be compared. The diagram shows that the fungus grew... show full transcript
Worked Solution & Example Answer:Why were tubes 1 and 2 included in the experiment? Tubes 1 and 2 are the control group to which other tubes can be compared - VCE - SSCE Biology - Question 5 - 2005 - Paper 1
Step 1
Why were tubes 1 and 2 included in the experiment?
Answer
Tubes 1 and 2 serve as control groups in the experiment. Control groups are essential for establishing a baseline to which experimental results can be compared. In this case, they help determine whether the abnormal fungus can grow in minimal media without any added amino acids.
Step 2
Step 3
Which of the following DNA sequences could lead to the production of an uninterrupted chain of amino acids in the abnormal fungus?
Answer
The DNA sequence that could lead to an uninterrupted chain of amino acids is:
sequence 3 TAATGACCCCGTG
This sequence does not have the DNA triplet for histidine (GTA or GTG), unlike sequences 1 and 2, which might lead to interruptions during translation.
Step 4
Explain why you made this selection in c.ii.
Answer
I selected sequence 3 because it does not contain the triplet that codes for histidine. Sequences 1 and 2 include codons that could potentially lead to premature termination of the polypeptide chain, disrupting the production of the desired amino acids.
Step 5
What difference would it have made to the model of DNA had they used the results of laboratory 1 only?
Answer
Using only the results from laboratory 1, which lacks crucial information obtained from laboratories 2 and 3, would have led to an incomplete understanding of the structure of DNA. The absence of diverse data would restrict the development of a comprehensive model, possibly overlooking significant characteristics of DNA.