How Dna Controls The Workings Of The Cell (Page 2 of 2) in pdf

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Name: _____________________________________________________________________ Hour: _____ Number: _____

4. Find ALL of the codons that can code for the amino acid leucine (Leu) and list them.

5. Diabetes is a disease characterized by the inability to break down sugars. Often a person with

diabetes has a defective DNA sequence that codes for the making of the insulin protein.

Suppose a person has a mutation in their DNA and the first triplet for the insulin gene reads T A T.

The normal gene reads T A G. What amino acid does the mutant DNA and the normal DNA code for

and will the person with this mutation be diabetic?

6. Another mutation changes the insulin gene to read T C T (instead of the normal T A G). Will this

person be diabetic? Explain.

7. DNA sequences are often used to determine relationships between organisms. DNA sequences

that code for a particular gene can vary, though organisms that are closely related will have very

similar sequences. This table shows the amino acid sequences of 4 organisms.

Human:

C C A

T A G

C A C

C T A

Chimpanzee:

C C A

T A A

C A C

C T A

Pig:

C C A

T G T

A A A

C G A

Cricket:

C C T

A A A

G G G

A C G

Based on these sequences, which two organisms are most closely related?

________________________

8. An unknown organism is found in the forest and the gene is sequenced as follows:

Unknown: C C A T G G A A T C G A

What kind of an animal do you think this is? _______________________________

How Dna Controls The Workings Of The Cell Page 2