Pearson Edexcel Level 3 GCE Biology A (Salters
Nuffield) Advanced Subsidiary PAPER 18 MAY
2025 MARK SCHEME: Development, Plants and
the Environment
,
,
, Prokaryotic Cells<<<correct answer is>>>
Simple cells without membrane-bound organelles.
Tissues<<<correct answer is>>>
Groups of similar cells performing specific functions.
Organs<<<correct answer is>>>
Structures composed of different tissues working together.
Organ Systems<<<correct answer is>>>
Groups of organs that perform related functions.
Nucleoid<<<correct answer is>>>
Region containing prokaryotic cell's genetic material.
Plasmids<<<correct answer is>>>
Small DNA molecules independent of chromosomal DNA.
70S Ribosomes<<<correct answer is>>>
Ribosomes found in prokaryotic cells.
Gram Positive Bacteria<<<correct answer is>>>
Bacteria with thick peptidoglycan cell walls.
Gram Negative Bacteria<<<correct answer is>>>
Bacteria with thin peptidoglycan and outer membrane.
80S Ribosomes<<<correct answer is>>>
Ribosomes found in eukaryotic cells.
Mitochondria<<<correct answer is>>>
Organelles responsible for energy production.
Chloroplasts<<<correct answer is>>>
Organelles for photosynthesis in plant cells.
Cell Wall<<<correct answer is>>>
Rigid outer layer providing structure to cells.
Vacuole<<<correct answer is>>>
Storage organelle in plant cells.
Tonoplast<<<correct answer is>>>
Membrane surrounding the vacuole in plant cells.
Lytic Cycle<<<correct answer is>>>
Viral replication process leading to cell lysis.
Latency
Virus remains inactive within host cells.
Nuffield) Advanced Subsidiary PAPER 18 MAY
2025 MARK SCHEME: Development, Plants and
the Environment
,
,
, Prokaryotic Cells<<<correct answer is>>>
Simple cells without membrane-bound organelles.
Tissues<<<correct answer is>>>
Groups of similar cells performing specific functions.
Organs<<<correct answer is>>>
Structures composed of different tissues working together.
Organ Systems<<<correct answer is>>>
Groups of organs that perform related functions.
Nucleoid<<<correct answer is>>>
Region containing prokaryotic cell's genetic material.
Plasmids<<<correct answer is>>>
Small DNA molecules independent of chromosomal DNA.
70S Ribosomes<<<correct answer is>>>
Ribosomes found in prokaryotic cells.
Gram Positive Bacteria<<<correct answer is>>>
Bacteria with thick peptidoglycan cell walls.
Gram Negative Bacteria<<<correct answer is>>>
Bacteria with thin peptidoglycan and outer membrane.
80S Ribosomes<<<correct answer is>>>
Ribosomes found in eukaryotic cells.
Mitochondria<<<correct answer is>>>
Organelles responsible for energy production.
Chloroplasts<<<correct answer is>>>
Organelles for photosynthesis in plant cells.
Cell Wall<<<correct answer is>>>
Rigid outer layer providing structure to cells.
Vacuole<<<correct answer is>>>
Storage organelle in plant cells.
Tonoplast<<<correct answer is>>>
Membrane surrounding the vacuole in plant cells.
Lytic Cycle<<<correct answer is>>>
Viral replication process leading to cell lysis.
Latency
Virus remains inactive within host cells.
