A level biology paper 1
A LEVEL BIOLOGY PAPER 1
(question and verified answers 2024-2025)
What's starch made from - ✔✔✔amylose and amylopectin
amylose estruture - ✔✔✔alpha helix 1,4 compact good for storage
pg. 1
, A level biology paper 1
amylopectin structure - ✔✔✔alpha helix 1,4 and 1,6 (slightly branched) - glucose can be
released quickly
Glycogen structure - ✔✔✔alpha glucose, branched
Structure of cholesterol - ✔✔✔hydrocarbon ring structure with OH group attached to
hydrocarbon tail
Conjugated protein - ✔✔✔Protein with a non-protein group attached
How do enzymes work - ✔✔✔Lower the activation energy by creating a transition state between
the enzyme and the substrate that is more stable than the uncatalysed reaction
Magnification of a transmission electron microscope - ✔✔✔X1,000,000
Resolution of a transmission electron microscope - ✔✔✔0.0002 micrometers
What can be used as a counterstain - ✔✔✔safranin dye
Magnification of light microscope - ✔✔✔X1500
Resolution of light microscope - ✔✔✔0.2micrometers
Resolution - ✔✔✔How detailed the image is. How well the microscope distinguishes between 2
points that are close together.
pg. 2
, A level biology paper 1
Nucleolus - ✔✔✔Produces ribosomes. Made of protein and RNA, which is used to make rRNA,
which combines with protein to form ribosome.
What's the plasma membrane made off - ✔✔✔Many lipids and proteins
Centrioles - ✔✔✔Small, hollow cylinders made of microtubules
Microfilaments - ✔✔✔Contractile fibres formed from actin, responsible or cell movement and
contraction during cytokinesis
Microtubules - ✔✔✔Determine shape of cell and act as tracks for the movement of organelles
Intermediate fibres - ✔✔✔Give cell mechanical strength and help maintain their integrity
Vacuoles - ✔✔✔Membrane lined sacs containing cell sap. Important in maintenance of turgor.
Tonoplast - ✔✔✔Membrane of vacuole and is selectively permeable
DNA in prokaryotic cells - ✔✔✔Circular, proteins fold and condense DNA, one molecule,
chromosome
DNA in eukaryotic cells - ✔✔✔Linear, associated with proteins called histones forming
chromatin, multiple chromosomes
Cell wall in prokaryotic cells made from - ✔✔✔Peptidoglycan/murein
pg. 3
A LEVEL BIOLOGY PAPER 1
(question and verified answers 2024-2025)
What's starch made from - ✔✔✔amylose and amylopectin
amylose estruture - ✔✔✔alpha helix 1,4 compact good for storage
pg. 1
, A level biology paper 1
amylopectin structure - ✔✔✔alpha helix 1,4 and 1,6 (slightly branched) - glucose can be
released quickly
Glycogen structure - ✔✔✔alpha glucose, branched
Structure of cholesterol - ✔✔✔hydrocarbon ring structure with OH group attached to
hydrocarbon tail
Conjugated protein - ✔✔✔Protein with a non-protein group attached
How do enzymes work - ✔✔✔Lower the activation energy by creating a transition state between
the enzyme and the substrate that is more stable than the uncatalysed reaction
Magnification of a transmission electron microscope - ✔✔✔X1,000,000
Resolution of a transmission electron microscope - ✔✔✔0.0002 micrometers
What can be used as a counterstain - ✔✔✔safranin dye
Magnification of light microscope - ✔✔✔X1500
Resolution of light microscope - ✔✔✔0.2micrometers
Resolution - ✔✔✔How detailed the image is. How well the microscope distinguishes between 2
points that are close together.
pg. 2
, A level biology paper 1
Nucleolus - ✔✔✔Produces ribosomes. Made of protein and RNA, which is used to make rRNA,
which combines with protein to form ribosome.
What's the plasma membrane made off - ✔✔✔Many lipids and proteins
Centrioles - ✔✔✔Small, hollow cylinders made of microtubules
Microfilaments - ✔✔✔Contractile fibres formed from actin, responsible or cell movement and
contraction during cytokinesis
Microtubules - ✔✔✔Determine shape of cell and act as tracks for the movement of organelles
Intermediate fibres - ✔✔✔Give cell mechanical strength and help maintain their integrity
Vacuoles - ✔✔✔Membrane lined sacs containing cell sap. Important in maintenance of turgor.
Tonoplast - ✔✔✔Membrane of vacuole and is selectively permeable
DNA in prokaryotic cells - ✔✔✔Circular, proteins fold and condense DNA, one molecule,
chromosome
DNA in eukaryotic cells - ✔✔✔Linear, associated with proteins called histones forming
chromatin, multiple chromosomes
Cell wall in prokaryotic cells made from - ✔✔✔Peptidoglycan/murein
pg. 3
