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EcologyHigherecologydata analysisnutrition

AQA GCSE · Question 07.5 · Ecology

Table 2Amino acidMass of amino acid in protein in g/kgNormal maizeQuality protein maize (QPM)Leucine122.288.1Lysine28.941.9Methionine19.918.1Phenylalanine49.440.9Threonine34.536.5Tryptophan7.316.3Valine45.951.2

The table compares the proportions of seven essential amino acids in normal maize and Quality Protein Maize (QPM). Which amino acids are found in significantly higher proportions in the QPM seeds?

Answer options:

A.

Lysine and tryptophan

B.

Lysine and valine

C.

Threonine and tryptophan

D.

Threonine and valine

How to approach this question

Go through the table row by row. For each amino acid, compare the value in the "Normal maize" column with the value in the "QPM" column. Identify which amino acids have a much larger value in the QPM column.

Full Answer

A.Lysine and tryptophan✓ Correct
Lysine and tryptophan
To answer this question, we need to compare the values for each amino acid in the "Normal maize" and "Quality protein maize (QPM)" columns. We are looking for the amino acids with significantly higher values in QPM. - **Leucine:** 122.2 -> 88.1 (Decrease) - **Lysine:** 28.9 -> 41.9 (Significant Increase) - **Methionine:** 19.9 -> 18.1 (Decrease) - **Phenylalanine:** 49.4 -> 40.9 (Decrease) - **Threonine:** 34.5 -> 36.5 (Slight Increase) - **Tryptophan:** 7.3 -> 16.3 (Significant Increase - more than doubled) - **Valine:** 45.9 -> 51.2 (Slight Increase) The two amino acids with the most significant increases are Lysine and Tryptophan.

Common mistakes

✗ Misreading the table. ✗ Choosing amino acids that decrease or only increase slightly. ✗ Only identifying one of the correct amino acids.

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