2025 EDEXCEL GCSE COMBINED SCIENCE HIGHER
BIOLOGY PAPER 1 MARK SCHEME
Eukaryotic cells - Correct Answer-✔✔Contain a nucleus and other organelles that are bound by
membranes.
prokaryotic cell - Correct Answer-✔✔cell lacking a nucleus and most other organelles
Nucleus - Correct Answer-✔✔A part of the cell containing DNA and RNA and responsible for
growth and reproduction
Cytoplasm - Correct Answer-✔✔A jellylike fluid inside the cell in which the organelles are
suspended
cell membrane - Correct Answer-✔✔A cell structure that controls which substances can enter or
leave the cell.
Mitochondria - Correct Answer-✔✔An organelle found in large numbers in most cells, in which
the biochemical processes of respiration and energy production occur.
Ribosomes - Correct Answer-✔✔site of protein synthesis
cell wall - Correct Answer-✔✔A rigid structure that surrounds the cell membrane and provides
support to the cell. made of cellulose
Vacuole - Correct Answer-✔✔Cell organelle that stores materials such as water, salts, proteins,
and carbohydrates
, Chloroplast - Correct Answer-✔✔An organelle found in plant and algae cells where
photosynthesis occurs
Plasmid DNA - Correct Answer-✔✔A ring of DNA capable of replicating itself. Found in bacteria
commonly.
Multicellular organisms - Correct Answer-✔✔Organisms composed of many cells (Ex. tissue,
humans, etc.)
sexual reproduction - Correct Answer-✔✔A reproductive process that involves two parents that
combine their genetic material to produce a new organism, which differs from both parents
egg cell - Correct Answer-✔✔female reproductive cell
sperm cell - Correct Answer-✔✔male reproductive cell
electron - Correct Answer-✔✔microscope that can magnify objects 100s of 1000s of times
Magnification - Correct Answer-✔✔the ratio of an object's image size to its real size
Enzymes - Correct Answer-✔✔Catalysts for chemical reactions in living things
active site - Correct Answer-✔✔The part of an enzyme where the chemical reaction occurs.
factors which affect the rate of reaction - Correct Answer-✔✔-temperature
-pH
BIOLOGY PAPER 1 MARK SCHEME
Eukaryotic cells - Correct Answer-✔✔Contain a nucleus and other organelles that are bound by
membranes.
prokaryotic cell - Correct Answer-✔✔cell lacking a nucleus and most other organelles
Nucleus - Correct Answer-✔✔A part of the cell containing DNA and RNA and responsible for
growth and reproduction
Cytoplasm - Correct Answer-✔✔A jellylike fluid inside the cell in which the organelles are
suspended
cell membrane - Correct Answer-✔✔A cell structure that controls which substances can enter or
leave the cell.
Mitochondria - Correct Answer-✔✔An organelle found in large numbers in most cells, in which
the biochemical processes of respiration and energy production occur.
Ribosomes - Correct Answer-✔✔site of protein synthesis
cell wall - Correct Answer-✔✔A rigid structure that surrounds the cell membrane and provides
support to the cell. made of cellulose
Vacuole - Correct Answer-✔✔Cell organelle that stores materials such as water, salts, proteins,
and carbohydrates
, Chloroplast - Correct Answer-✔✔An organelle found in plant and algae cells where
photosynthesis occurs
Plasmid DNA - Correct Answer-✔✔A ring of DNA capable of replicating itself. Found in bacteria
commonly.
Multicellular organisms - Correct Answer-✔✔Organisms composed of many cells (Ex. tissue,
humans, etc.)
sexual reproduction - Correct Answer-✔✔A reproductive process that involves two parents that
combine their genetic material to produce a new organism, which differs from both parents
egg cell - Correct Answer-✔✔female reproductive cell
sperm cell - Correct Answer-✔✔male reproductive cell
electron - Correct Answer-✔✔microscope that can magnify objects 100s of 1000s of times
Magnification - Correct Answer-✔✔the ratio of an object's image size to its real size
Enzymes - Correct Answer-✔✔Catalysts for chemical reactions in living things
active site - Correct Answer-✔✔The part of an enzyme where the chemical reaction occurs.
factors which affect the rate of reaction - Correct Answer-✔✔-temperature
-pH
