Sub-topic 1
2025 · National One-Eighth
Free
Cytoplasm and its organelles
Read past contest →
Sub-topic 2
2024 · National Preliminary
Premium
Animal cell parts and their functions
Read past contest →
Sub-topic 3
2025 · National One-Eighth
Premium
Enzymes, coenzymes and cofactors
Read past contest →
Sub-topic 4
2024 · National Preliminary
Premium
Cell membrane structure: the phospholipid bilayer and fluid mosaic model
Read past contest →
Sub-topic 5
2025 · National Preliminary
Premium
Cell membrane structure: the phospholipid bilayer and fluid mosaic model
Read past contest →
Sub-topic 6
2024 · National Preliminary
Premium
Flagella and cell motility structures
Read past contest →
Sub-topic 7
2024 · National Preliminary
Premium
Ribozymes: catalytic rna
Read past contest →
Sub-topic 8
2024 · National Preliminary
Premium
Organelle functions: energy production, photosynthesis, protein synthesis and packaging
Read past contest →
Sub-topic 9
2026 · National Preliminary
Premium
The cytoskeleton: protein filaments providing cell shape and support
Read past contest →
Sub-topic 10
2026 · National Preliminary
Premium
The lysosome and intracellular digestion
Read past contest →
Sub-topic 11
2026 · National Preliminary
Premium
Chromatin condensation into chromosomes during cell division
Read past contest →
Sub-topic 12
2026 · National Preliminary
Premium
Chromatin condensation into chromosomes during cell division
Read past contest →
Sub-topic 13
2026 · National Preliminary
Premium
Chromatin condensation into chromosomes during cell division
Read past contest →
Sub-topic 14
2025 · National Semifinal
Premium
Colors of light not absorbed by a photosynthetic pigment, inferred from its apparent color
Read past contest →
Sub-topic 15
2026 · National Quarterfinal
Premium
The golgi apparatus as the prominent organelle in secretory cells
Read past contest →
Sub-topic 16
2026 · National Quarterfinal
Premium
Grana: stacks of thylakoids where light-dependent reactions occur
Read past contest →
Sub-topic 17
2026 · National Quarterfinal
Premium
Nucleoprotein: the conjugated protein-nucleic acid form of genetic material
Read past contest →
Sub-topic 18
2026 · National Quarterfinal
Premium
The nucleolus: ribosome synthesis within the nucleus
Read past contest →
Sub-topic 19
2026 · National One-Eighth
Premium
Chloroplast structure: grana as stacks of thylakoids
Read past contest →
Sub-topic 20
2026 · National One-Eighth
Premium
Cell organelles: the rough endoplasmic reticulum
Read past contest →
Sub-topic 21
2018 · National Preliminary
Premium
Cell organelles: function of the nucleolus
Read past contest →
Sub-topic 22
2021 · National Preliminary
Premium
The cell as the structural and functional unit of life
Read past contest →
Sub-topic 23
2021 · National One-Eighth
Premium
Surface-area-to-volume ratio and cell size
Read past contest →
Sub-topic 24
2024 · National One-Eighth
Premium
Surface-area-to-volume ratio limits on unicellular organism size
Read past contest →
Sub-topic 25
2024 · National Quarterfinal
Premium
Riddle: autophagy, the cell's conserved self-degradation process
Read past contest →
Sub-topic 26
2024 · Regional Championship
Premium
Tonicity and osmotic terminology for a cell in a surrounding solution
Read past contest →
Sub-topic 27
2025 · National Preliminary
Premium
The phospholipid bilayer and selective permeability of the plasma membrane
Read past contest →
Sub-topic 28
2025 · National Preliminary
Premium
Sarcosomes: large mitochondria in striated muscle fibers
Read past contest →
Sub-topic 29
2023 · National Preliminary
Premium
The three components of a nucleotide: nitrogen base, sugar and phosphate (true/false)
Read past contest →
Sub-topic 30
2013 · National Preliminary
Premium
Function of the plasma membrane (selective permeability)
Read past contest →
Sub-topic 31
2013 · National Preliminary
Premium
Function of the golgi apparatus (processing and packaging)
Read past contest →
Sub-topic 32
2013 · National Preliminary
Premium
Function of vacuoles (storage)
Read past contest →
Sub-topic 33
2013 · National Quarterfinal
Premium
Surface-area-to-volume ratio as a limit on cell growth
Read past contest →
Sub-topic 34
2013 · National Quarterfinal
Premium
The endoplasmic reticulum moves proteins/substances through the cell
Read past contest →
Sub-topic 35
2013 · National Quarterfinal
Premium
The golgi apparatus modifies, sorts and packages proteins
Read past contest →
Sub-topic 36
2013 · National Quarterfinal
Premium
The flexible cell membrane lets a cell change shape
Read past contest →
Sub-topic 37
2017 · National Semifinal
Premium
Phospholipid structure and self-assembly into the selectively-permeable plasma membrane bilayer
Read past contest →
Sub-topic 38
2017 · National Quarterfinal
Premium
The nucleolus as the site of ribosome assembly
Read past contest →
Sub-topic 39
2017 · National Quarterfinal
Premium
The phospholipid bilayer as the major component of the cell membrane
Read past contest →
Sub-topic 40
2021 · National Semifinal
Premium
Gap junctions form direct cytoplasmic channels enabling intercellular communication
Read past contest →
Sub-topic 41
2022 · National Preliminary
Premium
Amyloplasts, elaioplasts and aleuroplasts store starch, lipids and proteins respectively
Read past contest →
Sub-topic 42
2022 · National One-Eighth
Premium
True or false: cells that seldom divide spend most of their time in interphase
Read past contest →
Sub-topic 43
2023 · National Preliminary
Premium
True or false: a plasmolyzed cell can be deplasmolyzed by placing it in an isotonic solution
Read past contest →
Sub-topic 44
2023 · National Preliminary
Premium
True or false: a plasmolyzed cell can be deplasmolyzed by placing it in a saturated solution
Read past contest →
Sub-topic 45
2023 · National Preliminary
Premium
True or false: a plasmolyzed cell can be deplasmolyzed by placing it in pure water or a hypotonic solution
Read past contest →
Sub-topic 46
2023 · National Preliminary
Premium
Prokaryotic cells resist osmotic shock better than eukaryotic cells due to their rigid cell wall
Read past contest →
Sub-topic 47
2023 · National One-Eighth
Premium
Microvilli are microscopic membrane protrusions on cell surfaces
Read past contest →
Sub-topic 48
2023 · National Preliminary
Premium
True or false: whether a 0.5 m nacl osmometer shrinks in an isotonic vs. a hypotonic external solution
Read past contest →
Sub-topic 49
2023 · National Preliminary
Premium
True or false: a 0.5m nacl osmometer would shrink in distilled water
Read past contest →