Friday test Flashcards
how can disease be spread?
air, blood, sexual fluids, touch.
why do bacteria make you ill/virus.
bacteria release toxins.
viruses causes massive cell death.
how is TMV spread
implications:
damage:
- direct contact
- reduced level of chlorophyll
- lower yields.
gonorrhoea symptoms:
- thick green smelly discharge from penis of vagina.
pain when urinating.
how is rose black spot spread?
implications:
- spores.
- large areas of discolouration.
- loss of vigour.
white blood cells:
consume pathogens.
produce anti toxins.
produce antibodies.
drugs need to be tested for 3 things
toxicity - how much can be taken before side effects are bad.
efficacy - how efficiently it works compared to existing drugs.
dosage - how much do you need to take for it to be effective.
discovery of aspirin
willow bark.
digitalis
highly toxic flowers
heart drug
aphids
suck all water/ions from plant
natural pest control
ionic bonding when
a metal atom reacts with a non-metal atom
covalent bonding is between
non metals.
solid particles in a
liquid particles
gas particles
fixed position, regular pattern, vibrate.
touch each and move, not in a fixed position, irregular pattern.
free movement, random, no regular arrangement.
density =
mass/volume.
volume =
mass/density
