Ib biology Study guides, Class notes & Summaries
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IB Biology HL Exam Review Latest Version Already Graded A
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IB Biology HL Exam Review Latest 
Version Already Graded A 
 
Outline the cell theory. Living organisms are composed of cells. 
Cells are the smallest unit of life. 
Cells come from pre-existing cells. 
 
Discuss the evidence for the cell theory. The nature of scientific theories could be introduced 
here: the accumulation of evidence that allows a hypothesis to become a theory; whether a theory 
should be abandoned when there is evidence that it does not offer a full explanation; and what 
evid...
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IB Biology Chapter 2 Latest 2024 Graded A+
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IB Biology Chapter 2 Latest 2024 
 
Graded A+ 
 
Vitalism Idea that living organisms are fundamentally different from non living things 
 
Most frequently occurring elements Oxygen 65% 
Carbon 19% 
Hydrogen 10% 
Nitrogen 3% 
 
Other elements Calcium 1.5% 
 
Phosphorus 1% 
Iron 0.7% 
Sulfur 0.25% 
Sodium 0.15% 
 
Molecular biology Science that aims to explain living processes in terms of chemical 
substances 
 
Synthesis of urea Discovered in human urine in the 18th century 
Organic compound synt...
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IB Biology Topic 2: Molecular Biology Latest Update Graded A+
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IB Biology Topic 2: Molecular Biology 
 
Latest Update Graded A+ 
 
How many bonds can carbon make carbon can make four covalent bonds 
 
Four most common compounds - carbon 
-hydrogen 
-nitrogen 
-oxygen 
 
what is life based on carbon compounds 
 
metabolism metabolism- chemical processes in the body, synthesis & breakdown of 
substances in living organisms. 
 
anabolism- the synthesis of complex molecules (simple to complex) (condensation reaction) 
catabolism- the breakdown of complex molecu...
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IB Biology Topic 4 : Ecology Latest Version Graded A+
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IB Biology Topic 4 : Ecology Latest 
 
Version Graded A+ 
 
Ecology The science of the relationships between organisms and their environments. 
 
Organism an individual living thing that uses energy, reproduces, responds, grows, and 
develops 
 
Species a group of similar organisms that can breed and produce fertile offspring 
 
Population group of individuals of the same species that live in the same area 
 
Community all living, or biotic, things in an area 
 
Ecosystem all biotic (living) and...
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IB Biology Topic 1: Cell Biology Latest Update Graded A
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IB Biology Topic 1: Cell Biology Latest 
 
Update Graded A 
 
Cell theory The theory that cells form the fundamental structural and functional units of all 
living organisms. 
 
Differentiation The expression of a particular gene(s) and not others in order for cell 
specialisation. 
 
Emergent properties The idea that the sum of an organism is more than the parts interacting 
and combining. Living things become more complex as they move (from individual cells to 
organ systems). 
 
Multicellular...
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IB Biology - 1.1 Introduction to Cells Questions and Answers Graded A+
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IB Biology - 1.1 Introduction to Cells 
Questions and Answers Graded A+ 
 
Main components of cell theory 1. All living things are made up of one or more cells 
2. All cells come from pre-existing cells 
3. Cells are the fundamental building blocks of all living organisms 
 
Smaller organisms are what type of cellular? Unicellular 
 
Larger organisms are what type of cellular? Multicellular 
 
Common features of cells? 1. Every cell is surrounded by a membrane, which separates the 
cell contents...
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IB Biology Unit 1 (Cell Biology - SL) Latest Update Graded A+
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IB Biology Unit 1 (Cell Biology - SL) 
 
Latest Update Graded A+ 
 
Cell Theory all living things are made up of cells, all cells come from previous cells, the cell 
is the basic fundamental unit of life 
 
Functions of life that the cell must carry out -Nutrition: obtaining food, to provide energy 
and the materials needed for growth 
- Metabolism: chemical reactions inside the cell, including cell respiration to release energy 
-Growth: an irreversible increase in size 
-Response: the ability ...
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IB Biology Paper 1 Questions And Answers Already Passed
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IB Biology Paper 1 Questions And 
 
Answers Already Passed 
 
Prokaryote or Eukaryote in paramecium? Compartments in the cell indicates that it's a 
eukaryote 
 
Property of water which makes it suitable for living? Thermal 
 
Watson and Crick discovery about DNA DNA is double helix 
 
What occurs in meiosis but not in mitosis? Homologous chromosomes pair up 
 
Variation within a population Fertilization and mutation 
 
properties of stem cells they can differentiate 
 
phospholipid bilayer the...
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IB Biology Topic 6 Latest Update 100% Pass
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IB Biology Topic 6 Latest Update 100% 
 
Pass 
 
pathogen any disease-producing agent (especially a virus or bacterium) 
 
antigen any surface protein that may elicit an immune response or cell recognition 
 
digestion the process where food is converted into smaller molecules that can be absorbed 
into the body 
 
enzymes globular proteins that speed up chemical reactions in the body 
 
amylase enzyme found in saliva and pancreatic juice that breaks the chemical bonds in 
starches 
 
protease e...
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IB Biology - Unit 1 - Cell Biology Latest Version 100% Pass
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IB Biology - Unit 1 - Cell Biology Latest 
 
Version 100% Pass 
 
Cell Theory The theory that cells form the fundamental structural and functional units of all 
living organisms 
 
Unicellular A single celled organism 
 
Multicellular Made up of more than one cell. 
 
Prokaryotic A small single cell lacking a nucleus or any other membrane-bound organelles. 
Bacterial cells are an example 
 
Eukaryotic A cell characterized by the presence of a nucleus and other membrane-bound 
organelles. Eukaryo...
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