Aqa A level Biology Common AO1 EXAM 1QUESTIONS AND VERIFIED CORRECT ANSWERS GRADED A+ -LATEST - GUARANTEED PASS.docx

Aqa A level Biology: Common AO1
QUESTIONS AND VERIFED CRRECT
ANSWERS GRADED A+ LATEST 2026-
2027 100% GUARANTEED PASS




Explain how oxygen is loaded, transported and unloaded in the blood. - CORRECT ANSWER-1.
Haemoglobin carries oxygen /

has a high affinity for oxygen /

oxyhaemoglobin;

2. In red blood cells;

3. Loading/uptake/association in

lungs;

4. at high p.O2;

5. Unloads/ dissociates / releases to

respiring cells/tissues;

6. at low p.O2;

7. Unloading linked to higher carbon

dioxide (concentration);

, Explain how a change in the DNA base sequence for a protein may result in a change in the
structure of the protein. - CORRECT ANSWER-Change in amino acid/s /primary

structure;

Change in hydrogen/ionic/ disulfide

bonds;

Alters tertiary structure;



Describe how gene transmission and selection have increased the difficulty of treating bacterial
infections with antibiotics. - CORRECT ANSWER-1. (Antibiotic) resistant gene/allele;

2. Vertical (gene) transmission;

3. Resistant bacteria (survive and)

reproduce / population of resistant

bacteria increases;

4. Increase in frequency of

(resistant) allele/gene (in future

generations);

5. Horizontal (gene) transmission;

6. Plasmid;

7. Conjugation / pilus (tube);

8. (Horizontal transmission/

conjugation) can occur between

bacteria of different species;



Farmers clear tropical forest and grow crops instead. Explain how this causes the diversity of
insects in the area to decrease. - CORRECT ANSWER-1. Lower diversity of plants/ few species of
plants/less

variety of plants/few plant layers;