Pearson Edexcel GCSE Biology Specification Overview
MOST RECENT COMPREHENSIVE QUESTIONS
AND ANSWERS GRADED |100% CORRECT!!
What are the fundamental units of living organisms? - ANSWER✔✔-Cells, which may
be part of highly adapted structures like tissues, organs, and organ systems.
How do living organisms interact within ecosystems? - ANSWER✔✔-They form
populations, communities, and interact with the environment and humans.
What is the significance of photosynthesis in life on Earth? - ANSWER✔✔-It allows
green plants and algae to fix carbon dioxide and produce organic compounds and
oxygen.
What role do organic compounds play in living organisms? - ANSWER✔✔-They are
used as fuels in cellular respiration for necessary chemical reactions.
How do chemicals cycle in ecosystems? - ANSWER✔✔-They continually cycle through
the natural world.
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,What influences the characteristics of a living organism? - ANSWER✔✔-Its genome and
interaction with the environment.
What process accounts for biodiversity and the relationships among organisms? -
ANSWER✔✔-Evolution by natural selection.
What are the main sub-cellular structures found in animal cells? - ANSWER✔✔-
Nucleus, cell membrane, mitochondria, and ribosomes.
What additional structures are present in plant cells compared to animal cells? -
ANSWER✔✔-Cell wall, chloroplasts, and vacuole.
What are the key sub-cellular structures found in bacteria? - ANSWER✔✔-
Chromosomal DNA, plasmid DNA, cell membrane, ribosomes, and flagella.
How are sperm cells specialized for their function? - ANSWER✔✔-They have an
acrosome, haploid nucleus, mitochondria, and a tail.
What adaptations do egg cells have to support their function? - ANSWER✔✔-Nutrients
in the cytoplasm, a haploid nucleus, and changes in the cell membrane after
fertilization.
What is a key feature of ciliated epithelial cells? - ANSWER✔✔-They have cilia that help
move substances across their surface.
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,How has electron microscopy improved our understanding of cell structures? -
ANSWER✔✔-It allows us to see cell structures and organelles with more clarity and
detail.
What is the mechanism of enzyme action? - ANSWER✔✔-Enzymes work by binding to
substrates at the active site, leading to a chemical reaction.
What can cause enzymes to become denatured? - ANSWER✔✔-Changes in
temperature, pH, or substrate concentration that alter the shape of the active site.
How do temperature and pH affect enzyme activity? - ANSWER✔✔-They can increase
or decrease the rate of enzyme reactions depending on optimal conditions.
What is the importance of enzymes as biological catalysts? - ANSWER✔✔-They
facilitate the synthesis and breakdown of carbohydrates, proteins, lipids, sugars, amino
acids, fatty acids, and glycerol.
What are some chemical reagents used to identify biological macromolecules? -
ANSWER✔✔-Reagents for starch, reducing sugars, proteins, and fats.
How can the energy in food be measured? - ANSWER✔✔-Using calorimetry.
What are the three main methods of substance transport into and out of cells? -
ANSWER✔✔-Diffusion, osmosis, and active transport.
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, What is a core practical related to osmosis? - ANSWER✔✔-Investigating osmosis in
potatoes.
How do you calculate percentage gain and loss of mass in osmosis? - ANSWER✔✔-By
comparing the initial and final mass of the specimen.
What are the stages of mitosis in the cell cycle? - ANSWER✔✔-Interphase, prophase,
metaphase, anaphase, telophase, and cytokinesis.
What is the importance of mitosis? - ANSWER✔✔-Mitosis is important for growth,
repair, and asexual reproduction.
What is produced during mitosis? - ANSWER✔✔-Two daughter cells, each with
identical sets of chromosomes to the parent cell, resulting in two genetically identical
diploid body cells.
What causes cancer in relation to cell division? - ANSWER✔✔-Cancer is caused by
changes in cells that lead to uncontrolled cell division.
How does cell division differ in animals and plants? - ANSWER✔✔-In animals, it
involves cell division and differentiation; in plants, it involves cell division, elongation,
and differentiation.
Why is cell differentiation important? - ANSWER✔✔-It is crucial for the development
of specialized cells.
OLIVIA GREENWAYS© 2025, ALL RIGHTS RESRVED 4
MOST RECENT COMPREHENSIVE QUESTIONS
AND ANSWERS GRADED |100% CORRECT!!
What are the fundamental units of living organisms? - ANSWER✔✔-Cells, which may
be part of highly adapted structures like tissues, organs, and organ systems.
How do living organisms interact within ecosystems? - ANSWER✔✔-They form
populations, communities, and interact with the environment and humans.
What is the significance of photosynthesis in life on Earth? - ANSWER✔✔-It allows
green plants and algae to fix carbon dioxide and produce organic compounds and
oxygen.
What role do organic compounds play in living organisms? - ANSWER✔✔-They are
used as fuels in cellular respiration for necessary chemical reactions.
How do chemicals cycle in ecosystems? - ANSWER✔✔-They continually cycle through
the natural world.
OLIVIA GREENWAYS© 2025, ALL RIGHTS RESRVED 1
,What influences the characteristics of a living organism? - ANSWER✔✔-Its genome and
interaction with the environment.
What process accounts for biodiversity and the relationships among organisms? -
ANSWER✔✔-Evolution by natural selection.
What are the main sub-cellular structures found in animal cells? - ANSWER✔✔-
Nucleus, cell membrane, mitochondria, and ribosomes.
What additional structures are present in plant cells compared to animal cells? -
ANSWER✔✔-Cell wall, chloroplasts, and vacuole.
What are the key sub-cellular structures found in bacteria? - ANSWER✔✔-
Chromosomal DNA, plasmid DNA, cell membrane, ribosomes, and flagella.
How are sperm cells specialized for their function? - ANSWER✔✔-They have an
acrosome, haploid nucleus, mitochondria, and a tail.
What adaptations do egg cells have to support their function? - ANSWER✔✔-Nutrients
in the cytoplasm, a haploid nucleus, and changes in the cell membrane after
fertilization.
What is a key feature of ciliated epithelial cells? - ANSWER✔✔-They have cilia that help
move substances across their surface.
OLIVIA GREENWAYS© 2025, ALL RIGHTS RESRVED 2
,How has electron microscopy improved our understanding of cell structures? -
ANSWER✔✔-It allows us to see cell structures and organelles with more clarity and
detail.
What is the mechanism of enzyme action? - ANSWER✔✔-Enzymes work by binding to
substrates at the active site, leading to a chemical reaction.
What can cause enzymes to become denatured? - ANSWER✔✔-Changes in
temperature, pH, or substrate concentration that alter the shape of the active site.
How do temperature and pH affect enzyme activity? - ANSWER✔✔-They can increase
or decrease the rate of enzyme reactions depending on optimal conditions.
What is the importance of enzymes as biological catalysts? - ANSWER✔✔-They
facilitate the synthesis and breakdown of carbohydrates, proteins, lipids, sugars, amino
acids, fatty acids, and glycerol.
What are some chemical reagents used to identify biological macromolecules? -
ANSWER✔✔-Reagents for starch, reducing sugars, proteins, and fats.
How can the energy in food be measured? - ANSWER✔✔-Using calorimetry.
What are the three main methods of substance transport into and out of cells? -
ANSWER✔✔-Diffusion, osmosis, and active transport.
OLIVIA GREENWAYS© 2025, ALL RIGHTS RESRVED 3
, What is a core practical related to osmosis? - ANSWER✔✔-Investigating osmosis in
potatoes.
How do you calculate percentage gain and loss of mass in osmosis? - ANSWER✔✔-By
comparing the initial and final mass of the specimen.
What are the stages of mitosis in the cell cycle? - ANSWER✔✔-Interphase, prophase,
metaphase, anaphase, telophase, and cytokinesis.
What is the importance of mitosis? - ANSWER✔✔-Mitosis is important for growth,
repair, and asexual reproduction.
What is produced during mitosis? - ANSWER✔✔-Two daughter cells, each with
identical sets of chromosomes to the parent cell, resulting in two genetically identical
diploid body cells.
What causes cancer in relation to cell division? - ANSWER✔✔-Cancer is caused by
changes in cells that lead to uncontrolled cell division.
How does cell division differ in animals and plants? - ANSWER✔✔-In animals, it
involves cell division and differentiation; in plants, it involves cell division, elongation,
and differentiation.
Why is cell differentiation important? - ANSWER✔✔-It is crucial for the development
of specialized cells.
OLIVIA GREENWAYS© 2025, ALL RIGHTS RESRVED 4
