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;