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Combined Science: Biology

GCSE · Edexcel · foundation

QuestionsFlashcards

Disease
Defence Against Disease
Development of Medicines
- Antibiotics
  4
- Discovery & Development of New Drugs
  3
Non-Communicable Diseases
- Lifestyle & Non-Communicable Disease
  7
- Cardiovascular Disease
  6

The Organism in the Environment
Human Influences on the Environment
- Human Impact on Biodiversity
  6
- Benefits of Maintaining Biodiversity
  4
Cycles within Ecosystems

Using Units Flashcards

All 6 cards in this deck

What does the prefix milli mean?: 10⁻³ (one thousandth). e.g. 1 mm = 0.001 m
What does the prefix micro mean?: 10⁻⁶ (one millionth). e.g. 1 µm = 0.000001 m
What do the prefixes nano and pico mean?: nano = 10⁻⁹ and pico = 10⁻¹².
How many micrometres (µm) are there in 1 millimetre (mm)?: 1 000
Which unit is normally used to give the size of animal cells?: The micrometre (µm) – a typical animal cell is about 10–20 µm across.
True or false? A nanometre is larger than a micrometre.: False. A nanometre is $10^{-9}$ m and a micrometre is $10^{-6}$ m, so a nanometre is 1000 times smaller.