GCSE EDEXCEL
BIOLOGY May 2023 -
PAPER 1 Higher Tier
Mark Scheme (1BI0/1H)
Explain the importance of cell differentiation -
ANSWER-Once specialized, cells can preform a
certain function in the body, which they are
adapted to
How do percentile charts work to measure
growth - ANSWER-The higher the percentile,
the taller the child is compared to those of a
similar age and gender
Explain the structure of an animal cell -
ANSWER-Cytoplasm: Jelly-like material that
contains dissolved nutrients and salts and
structures called organelles. It is where many of
the chemical reactions happen.
Nucleus: Contains genetic material, including
DNA, which controls the cell's activities.
Cell membrane: It is permeable to some
substances but not to others and so controls
the movement of substances in and out of the
cell.
Mitochondria: Organelles that contains the
enzymes for respiration, and where most
energy is released in respiration.
Ribosomes: Tiny structures where protein
synthesis occurs.
Describe the structure of a plant cell - ANSWERSame as animal cell but has:
Chloroplasts+ Chlorophyll: Used for
photosynthesis
Vacuole: Filled with cell sap to help keep the
cell swollen
Cell wall: Provides structure and protection
Describe the structure of bacteria - ANSWERChromosonal DNA: Where the DNA is stored
Flagellum: Helps move the bacteria
Cell wall: Provides structure and protection
How are sperm cells specialised - ANSWER-long
tail and streamline head to help it swim to the
egg
Lot of mitochondria in the cell to provide the
energy needed
Carries enzymes in its head to digest through
the egg cell membrane
How are egg cells specialised - ANSWER-They
have a haploid nucleus, extra nutrients and
extra mitochondria
State how to work out different units from
milli-pico - ANSWER-milli (10−3)
micro (10−6)
nano (10−9)
pico (10−12
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