science biology Flashcards
what’s the shape of dna
double helix - looks like two strands that wind around each other like a spiral
where is dna found
nucleus
what is a prokaryotic cell
no nucleus (bacteria) - humans / plants are eukaryotic
what is a eukaryotic cell
what is an enzyme
speed up chemical reactions / digestion
what can denature(breaks down) an enzyme
too hot / pH (too acidic)
what is aerobic respiration
oxygen + glucose —>carbon dioxide + water (energy) cells: mitochondria
what is anaerobic respiration
no oxygen:
* humans - glucose -> lactic acid
* plants - glucose -> carbon dioxide & ethanol
what limits the rate of photosynthesis
light intensity (needs sunlight) / temperature (enzymes need for energy or they break down/denature) / carbon dioxide
what is photosynthesis
when plants(chloroplast) absorb sunlight
* carbon dioxide + water -> glucose + oxygen
what is a neuron
nerve cell - send messages around types : sensory / motor
where does photosynthesis take place
chloroplasts
what is denaturing
in active site
losing shape
what are the four bases of dna? how are they prepared
at gc
process of anaerobic respiration
glucose -> lactic acid
respiring without oxygen
