Some questions of the teacher

Answer the questions:
The table shows the base composition of genetic material from ten sources.
Source of genetic material

Base composition (%)
1. Adenine
2. Guanine
3. Thymine
4. Cytosine
5. Uracil

Cattle thymus gland
1. 28.2
2. 21.5
3. 27.8
4. 22.5
5. 0.0

Cattle spleen
1. 27.9
2. 22.7
3. 27.3
4. 22.1
5. 0.0

Cattle sperm
1. 28.7
2. 22.2
3. 27.2
4. 22.0
5. 0.0

Pig thymus gland
1. 30.0
2. 20.4
3. 28.9
4. 20.7
5. 0.0

Salmon
1. 29.7
2. 20.8
3. 29.1
4. 20.4
5. 0.0

Wheat
1. 27.3
2. 22.7
3. 27.1
4. 22.8
5. 0.0

Yeast
1. 31.3
2. 18.7
3. 32.9
4. 17.1
5. 0.0

E coli (bacteria)
1. 26.0
2. 24.9
3. 23.9
4. 25.2
5. 0.0

Human sperm
1. 31.0
2. 19.1
3. 31.5
4.18.4
5. 0.0

Influenza virus
1. 23.0
2. 20.0
3. 0.00
4. 24.5
5. 32.5

A) Deduce the type of genetic material used by
• Cattle
• E.coli
• Influenza viruses
B) Suggest a reason for the difference between Cattle thymus gland, Spleen and
sperm in the measurements of their base composition.
C) – Explain the reasons for the total amount of adenine plus guanine being close to
50% in the genetic material of many of the species in the table.
_Identify two other trends in the base composition of the species that have 50%
adenine and guanine.
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