Biology in general facts need to know Flashcards
What is the term used which is the study of animal behaviour?
Ethology
What are 5 animal behaviour which indicate stress?
Stereotypy, misdirected behaviour, inhibited reproduction, poor parenting altered levels of activity such as low (apathy) to very high (hysteria).
What is net assimilation?
Net assimilation is the increase in mass due to photosynthesis minus the loss due to respiration. This can be measured by the increase in dry mass per unit leaf area.
What is the name for the total plant biomass
Biological yield.
What is the name for the mass of desired product in plants.
economic yield.
How is the harvest index calculated?
The harvest index is calculated by dividing the dry mass of the economic yield by the dry mass of the biological yield.
What is hybrid vigour?
Hybrid viogour means genetically and physically stronger F1 offspring with desirable characteristics from each parent.
What is the term given for the combination of chemical and biological controls for major pest problems?
Integrated pest management
Why are keystone species important?
the ecosystem would collapse without their services.
Genetic diversity
the genetic variation represented by the number and frequency of alleles in a population.
Species diversity
the number of different species in an ecosystem (species richness) and the relative abundance of each species; species diversity can be influenced by the negative impact of a dominant species.
Ecosystem diversity
the number of distinct ecosystems within an area.
What is the term given for the destruction of rainforests and the widespread or deserts caused by inappropriate farming methods as well as other human activities?
ecosystem degradation
Properties of invasive species 4
- Spread rapidly
-eliminate native species - Free of predators, parasites, pathogens
- Invasive species may hybridise with native species
What is the independent variable
The Independent variable is the variable which has been chosen to change.
What is the dependent variable
The dependent variable is the factor measured to judge the effect of changing the independent variable.
When are integrated metabolic pathways formed?
Integrated metabolic pathways are formed when catabolic and anabolic pathways become interdependent.
Enzyme induction involves what three genes on bacterial DNA?
*Structural gene coding for enzyme.
*Operator gene which switches structural gene “on” and “off”
*Regulator gene which codes of repressor protein molecules.
What is activation energy?
Activation energy is the minimum energy required for chemical molecules to react together within a cell. Enzymes are catalysts which lower activation energy and speed up the chemical reactions which are vital for life.
What is induced fit?
Induced fit is when the shape of the active site changes slightly to accept an alternative substrate molecule.
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