2025 AQA AS BIOLOGY Paper 1 Worked Exam Solutions (MARKING SCHEME ATTACHED) Monday 12 May 2025 [VERIFIED]

2025 AQA AS BIOLOGY Paper 1 Worked Exam Solutions (MARKING SCHEME ATTACHED) Monday 12
May 2025 [VERIFIED]

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0 1 . 1 Figure 1 shows the structure of the amino acid alanine.

Figure 1




Name the NH2 and COOH groups in the amino acid.
[1 mark]

NH2

COOH


Figure 2 shows the molecule formed from alanine and another amino acid.

Figure 2




0 1 . 2 Name the type of bond and the type of molecule formed when the two amino acids in
Figure 2 are joined.
[2 marks]

Type of bond

Type of molecule




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0 1 . 3 box
Table 1 shows the R groups of six different amino acids.

Table 1


Amino acid R group Amino acid R group

Alanine CH3 Glycine H

Aspartic acid CH2COOH Serine CH2OH

Glutamine (CH2)2CONH2 Valine CH(CH3)2


Use the information in Table 1 to identify the amino acid joined to alanine in
Figure 2.
[1 mark]




Question 1 continues on the next page




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