Biology paper corrections Flashcards
Properties of cellulose
High TENSILE Strength Insoluble Inert Flexible Can form hydrogen bonds with neighbouring chains
Respiratory quotient
CO2 produced / O2 consumed
Glucose - 1
Fatty acids - 0.7
Amino acids - 0.8/0.9
How does repeating the experiment improve investigations?
The mean can be calculated
anomalies can be identified
Systole
Contraction
Why do unmyelinated neurones have slower transmission of action potentials?
Because there are no nodes of Ranvier
Shorter local currents
The whole axon needs to be depolarised
Advantage of blinking reflex
Involuntary
Prevents damage to eye
What bonds are formed in the synthesis of polynucleotides?
Ester bonds
What happens if damaged DNA is detected at the G2 checkpoint?
The cell cycle is halted and the cell tries to repair the damage
How does bioinformatics replicate DNA?
PCR - polymerase chain reaction
Ecosystem definition
A community of organisms interrelated with the physical and chemical environment
How do you know if it is a light microscope?
Colour visible
No smaller organelles visible like ribosomes
x1500 max magnification
Uses of mitosis
Growth and repair of tissues
Asexual reproduction
Proliferation of white blood cells
Developing body plan
What is it when working out whether information is significant?
Only concluded as significant when a statistical test is done
How can genetic diversity be measured?
Genetic polymorphism - proportion of heterozygotes
Why does a genetic bottleneck cause reduction in genetic diversity?
Because alleles are lost when the population decreases
The remaining modern population is descended from the few survivors
