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History (First Exam 2028)
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Physics
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Psychology (First Exam 2027)
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Student Questions

Biology

D4.3 Climate change

How Is Climate Change Causing Evolution in Real Time? (AHL; Tawny Owl Color)

Learn how reduced snow cover changes natural selection in tawny owls, altering inherited color frequencies and causing evolution in real time.

A4.2 Conservation of biodiversity

What Is Causing the Sixth Mass Extinction?

Learn the anthropogenic causes of the sixth mass extinction, how they reduce biodiversity, and the precise terminology IB Biology expects in exams.

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A3.1 Diversity of organisms

What Is a Karyotype/Karyogram Used For?

Learn how karyotypes and karyograms are used to classify chromosomes, identify chromosomal abnormalities, and support evolutionary evidence in IB Biology.

A3.1 Diversity of organisms

What Is the Difference Between a Genome and a Gene?

Learn how a gene is a specific DNA sequence while a genome is an organism’s complete genetic information, with precise IB Biology examples and exam guidance.

A3.1 Diversity of organisms

How Is Whole Genome Sequencing Used in Medicine?

Learn how whole genome sequencing identifies genetic variants, supports diagnosis and treatment choices, and enables personalized medicine in IB Biology.

A3.1 Diversity of organisms

What Is a Dichotomous Key and How Do You Make One? (AHL)

Learn how dichotomous keys identify organisms through paired choices and how to construct an accurate key for IB Biology AHL exam questions and practicals.

A3.1 Diversity of organisms

Why Can't the Biological Species Concept Apply to Bacteria? (AHL; Horizontal Gene Transfer)

Learn why bacterial asexual reproduction and horizontal gene transfer prevent reliable use of the biological species concept in IB Biology AHL.

A3.1 Diversity of organisms

How Does Environmental DNA (eDNA) Barcoding Work? (AHL)

Learn how environmental DNA is collected, amplified, sequenced and compared with reference barcodes to identify species for IB Biology AHL exams.

A3.1 Diversity of organisms

What Are Single-Nucleotide Polymorphisms (SNPs)?

Learn what SNPs are, how base substitutions create them, why they may or may not alter proteins, and how IB Biology tests genomic variation in exams.

A3.1 Diversity of organisms

How Many Chromosomes Do Humans Have vs Chimpanzees?

Humans have 46 chromosomes, while chimpanzees have 48. Learn why their chromosome numbers differ and how chromosome fusion provides evolutionary evidence.

A3.1 Diversity of organisms

Did Human Chromosome 2 Come From a Fusion of Ape Chromosomes?

Learn the genetic evidence that human chromosome 2 formed through fusion of two ancestral primate chromosomes and how to explain it in IB Biology.

A3.1 Diversity of organisms

What Is the Biological Species Concept?

Learn how the biological species concept defines species through interbreeding and fertile offspring, its limitations, and how IB Biology tests it.

A3.1 Diversity of organisms

Why Is It Hard to Define a Species?

Learn why species are hard to define, compare morphological and biological species concepts, and master the SL and HL distinctions required in IB Biology exams.

A3.1 Diversity of organisms

What Is the Binomial Naming System?

Learn how the binomial naming system gives each species a two-part scientific name and how to format these names correctly in IB Biology exams.

A2.2 Cell structure

What Is the Evidence for Endosymbiotic Theory? (AHL)

Learn the evidence that mitochondria and chloroplasts evolved from prokaryotes through endosymbiosis, with precise IB Biology AHL exam links.

A2.2 Cell structure

Why Did Multicellularity Evolve? (AHL)

Learn why multicellularity evolved repeatedly, how larger size and cell specialization provide advantages, and how to answer IB Biology AHL exam questions.

A2.2 Cell structure

How Did Mitochondria and Chloroplasts Originate? (Endosymbiotic Theory; AHL)

Learn how endosymbiotic theory explains the origins of mitochondria and chloroplasts, including the key evidence required for IB Biology AHL.

A2.2 Cell structure

Why Don't Red Blood Cells Have a Nucleus? (Atypical Cells)

Learn why mature mammalian red blood cells lose their nucleus, how this supports oxygen transport, and how to explain this atypical cell in IB Biology exams.

A2.2 Cell structure

How Do You Calculate Magnification and Actual Size From a Micrograph?

Learn how to calculate magnification and actual size from IB Biology micrographs using scale bars, unit conversions, formulas, and worked exam examples.

A2.2 Cell structure

What Is the Difference Between Light and Electron Microscopy?

Compare light and electron microscopy by radiation source, resolution, magnification, specimen preparation, image type and uses in IB Biology.

A2.2 Cell structure

What Organelles Are in a Eukaryotic Cell?

Learn the organelles found in eukaryotic cells, their functions, and the key differences among animal, plant and fungal cells for IB Biology exams.

A2.2 Cell structure

What Is the Difference Between Plant, Animal, and Fungal Cells?

Compare plant, animal, and fungal cells for IB Biology, including cell walls, chloroplasts, vacuoles, centrioles, and key exam misconceptions.

A2.2 Cell structure

What Is the Difference Between Prokaryotic and Eukaryotic Cells?

Compare prokaryotic and eukaryotic cells by nucleus, DNA, ribosomes, organelles, size and cell walls using precise IB Biology exam terminology.

A2.2 Cell structure

What Structures Do All Cells Have in Common?

Learn the four structures shared by prokaryotic and eukaryotic cells: a plasma membrane, cytoplasm, DNA and ribosomes, for IB Biology exams.

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