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Biology paper 1 2025 comprehensive questions and
verified detailed solutions |100% CORRECT!!
TOPIC 1: KEY CONCEPTS IN BIOLOGY
1.1 Explain how the sub-cellular structures of eukaryotic and
prokaryotic cells are related to their functions, including:
a) animal cells - nucleus, cell membrane, mitochondria and
ribosomes
b) plant cells - nucleus, cell membrane, cell wall, chloroplasts,
mitochondria, vacuole and ribosomes
c) bacteria - chromosomal DNA, plasmid DNA, cell
membrane, ribosomes and flagella - (ANSWER)CELLS:
Prokaryotes: (prokaryotic cell- single cellede organism)
Eukaryotes: (eukaryotic cells- complexed)
ANIMAL CELL:
1) Nucleus- contain genetic material that controls activites of cell(chromosomes)
2) Cytoplasm- gel-like substance where chemical reactions occur (contains
enzyme
3) Cell membrane- holds cell together controls what goes in and out.
4) Mitochondria- reactions of respiration take place here which transfers energy
for cell to work
, 2
5) Ribosomes- translation of genetic material in synthesis of proteins.
PLANT CELL:
(all from animal cell)
6) Cell wall- rigid made of cellulose which supports and strengthens cell
7) Large vacuole- contains cell sap for internal pressure for support
8) Chloroplasts- where photosynthesis occurs for food and contains chlorophyll
BACTERIAL CELL:
1) Chromosomal DNA- (long circular chromosome) controls activities and
replication floats free
2) Ribosomes
3)Cell membrane
4) Plasmid DNA- small loops of extra DNA which contain genes like drug resistance
5) Flagellum- long hair like structure rotates to move away from toxins towards
nutrients & oxygen
TOPIC 1: KEY CONCEPTS IN BIOLOGY
1.2 Describe how specialised cells are adapted to their function,
including:
a) sperm cells - acrosome, haploid nucleus, mitochondria and
Biology paper 1 2025 comprehensive questions and
verified detailed solutions |100% CORRECT!!
TOPIC 1: KEY CONCEPTS IN BIOLOGY
1.1 Explain how the sub-cellular structures of eukaryotic and
prokaryotic cells are related to their functions, including:
a) animal cells - nucleus, cell membrane, mitochondria and
ribosomes
b) plant cells - nucleus, cell membrane, cell wall, chloroplasts,
mitochondria, vacuole and ribosomes
c) bacteria - chromosomal DNA, plasmid DNA, cell
membrane, ribosomes and flagella - (ANSWER)CELLS:
Prokaryotes: (prokaryotic cell- single cellede organism)
Eukaryotes: (eukaryotic cells- complexed)
ANIMAL CELL:
1) Nucleus- contain genetic material that controls activites of cell(chromosomes)
2) Cytoplasm- gel-like substance where chemical reactions occur (contains
enzyme
3) Cell membrane- holds cell together controls what goes in and out.
4) Mitochondria- reactions of respiration take place here which transfers energy
for cell to work
, 2
5) Ribosomes- translation of genetic material in synthesis of proteins.
PLANT CELL:
(all from animal cell)
6) Cell wall- rigid made of cellulose which supports and strengthens cell
7) Large vacuole- contains cell sap for internal pressure for support
8) Chloroplasts- where photosynthesis occurs for food and contains chlorophyll
BACTERIAL CELL:
1) Chromosomal DNA- (long circular chromosome) controls activities and
replication floats free
2) Ribosomes
3)Cell membrane
4) Plasmid DNA- small loops of extra DNA which contain genes like drug resistance
5) Flagellum- long hair like structure rotates to move away from toxins towards
nutrients & oxygen
TOPIC 1: KEY CONCEPTS IN BIOLOGY
1.2 Describe how specialised cells are adapted to their function,
including:
a) sperm cells - acrosome, haploid nucleus, mitochondria and
