BY4 Questions Flashcards
Where is carbon dioxide reduced to a hexose sugar?
Stroma.
Where is oxygen produced from water?
Grana.
Where is there a high concentration of RuBisCo?
Stroma.
Where is amylose and amylopectin found?
Starch grain.
State three functions of a synapse.
Transmit impulses between neurones.
Filter out low level stimuli.
Protect from over stimulation.
Describe and explain the shape of the population growth curve of a bacteria cultured in a batch fermenter.
Lag phase-due to DNA replication, synthesis of enzymes and proteins, getting used to growth medium, slow population growth.
Exponential phase-rapid cell division, abundance of nutrients, O2, low level of waste products.
Population doubles per unit of time.
Population increase begins to slow-lack of nutrients, waste products build.
Stationary phase-cell production=cell death, carrying capacity.
Lack of nutrients, build up of waste products.
Death phase-cell death exceeds cell production.
Describe the importance of bacteria in the maintenance of soil fertility.
Decomposition.
Recycling of nutrients.
Breakdown of organic materials into inorganic.
Nitrifying bacteria.
Nitrosomonas, nitrobacter.
Ammonium ions to nitrites and nitrites to nitrates.
Nitrogen fixing bacteria.
Atmospheric nitrogen converted into organic nitrogen.
Free living azotobacter.
Rhizobium.
Root nodules of legumes.
Suggest how farming practices can encourage the activity of these bacteria.
Denitrification.
Encourage aerobic conditions to stop denitrifyers/ploughing.
Drainage for aerobic conditions.
Grow leguminous crops/add organic waste products.
Where is chlorophyll found?
Grana.
