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This week in Biology

Power Up —
The Energy Secrets of Life

Explore this week's theme with new games, surprising facts and exam questions to try.

5quick games8animations?Newexam questionsExplore this week
Specimen collection

Real cells. Real microscopes.

Hover to see them shine, tap to flip for an exam tip.

RareMitosis in an onion root tipProphase, metaphase, anaphase and telophase, all in one field of view.Exam tip: Root tips are used for mitosis practicals because cells there divide constantly.Study this →Image: Ibn Anvar · CC0
LegendaryE. coli bacteriaA cluster of rod-shaped prokaryotic cells: no nucleus, DNA loose in the cytoplasm.Exam tip: A bacterium is about 1 µm long, roughly 10× smaller than a typical animal cell.Study this →Image: Eric Erbe & Christopher Pooley, USDA ARS · Public domain
EpicHuman cells, lit upNuclei (cyan), microtubules (green) and the Golgi apparatus (orange) in cultured HeLa cells.Exam tip: Fluorescent dyes let scientists see one structure at a time inside a living cell.Study this →Image: National Institutes of Health · Public domain
LegendaryLeaf surface with stomataHair-like trichomes rise above tiny stomata, each flanked by two guard cells.Exam tip: Guard cells are specialised to open and close stomata, controlling gas exchange and water loss.Study this →Image: Louisa Howard, Dartmouth EM Facility · Public domain
RareA root hair cellOne long extension of an epidermal cell reaching out into the soil.Exam tip: Root hairs give a huge surface area for absorbing water by osmosis and minerals by active transport.Study this →Image: Berkshire Community College Bioscience Image Library · CC0
RarePlant leaf cellsJigsaw-shaped epidermal cells with cell walls, nuclei and small green chloroplasts.Exam tip: Plant cells have a cellulose cell wall, a permanent vacuole and chloroplasts; animal cells have none of these.Study this →Image: Elina4ka · CC0
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Bio games and interesting facts

Make biology fun: new games and surprising facts every week.

Power Up: The Energy Secrets of Life · new this week · 4 weeks in the archive

Question 1 of 8
0 ✓

Which gas do plants release as a by-product of photosynthesis?

Stay healthy with biology

We're all exposed to infections every day

Track key infectious diseases, see where they're spreading and learn how your body fights back.

Most widespreadCOVID-1922.1M active cases
Countries watched6Highest active case counts
People currently sick22,123,398Active reported cases

Active cases in the most affected countries

  1. India44.5M
  2. Japan33.7M
  3. Turkey17.1M
  4. Iran7.5M
  5. Poland6.5M
  6. Greece6.1M

Source: disease.sh (official COVID-19 reports). Public estimates; not medical advice.

  • Build healthy habits:
  • Wash hands
  • Stay vaccinated
  • Eat well
  • Keep active
  • Sleep enough
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