Past Questions Flashcards
Name a biological molecule containing phosphorus
RNA
Phospholipids
Describe the role of microorganism sin producing nitrates from the remains of dead organisms
Saprobiotic bacteria break down remains
Ammonia ions into nitrite and then into nitrate
By nitrifying Bactria - nitrification
Upwelling often results in high primary productivity in costal waters explain why some of the most productive fishing areas are found in costal waters
Nitrate absorbed by plants used for growth
More producers/ plants so more food so more fish
Explain why Co2 uptake is a measure of productivity in plants
Shows photosynthesis and shows productivity minus respiration
What are the two equations for the hardy Weinberg equation
P+q =1
P^2+2pq+q^2=1
Explain the economic consequences of the spread of a plant pest such as hydrilla in water ways
Cost of removal
Cost of restoring habitat
Loss of income from fishing
Loss of income from tourism and recreation
During the light-independent reaction of photosynthesis, carbon dioxide is converted into organic substances. Describe how.
Carbon dioxide combines with RuBP This produces 2 GP GP reduced to TP Using energy from ATP TP converted into glucose
Explain how human activities have contributed to global warming
Carbon dioxide is a green house gas Deforestation so less Co2 removed by photosynthesis Burning produces Co2 Methane is a greenhouse gas Methane comes from landfills and cattle
Name a biological molecule containing nitrogen
ATP
amino acid
Does the link reaction in respiration produce Carbon dioxide
Yes
Give 2 ways in which the properties of ATP make it a suitable source of energy in biological process
Energy realised in small/ suitable amounts
Soluble
Involves a single/ simple reaction
Humans synthesise more than there own body mass of ATP each day. Explain why it is necessary for them to synthesise such a large amount of ATP
ATP is unstable
ATP cannot be stored/ is an immediate source of energy
Used in muscle contraction and active transport
ATP only releases a small amount of energy at a time
The over application of fertiliser increases the rate of leaching. Explain the consequences of leaching of fertiliser into ponds and lakes
Increased algae/ algal bloom Light blocked out Plants can photosynthesise and die Saprobiotic Bactria break down dead organisms The Bactria use up oxygen
What are the advantages of natural fertiliser
Acts as soil conditioner
Contains other elements/ wider range of elements
Production of artificial fertiliser energy consuming
Less leaching/ slower release of nutrient
Explain what is meant by a phenotype
Appearance due to genotype
Apparently due to environment
