Biol Folder Flashcards
Why does the buret test turn purple?
The presence of peptide bonds causes copper ions to be reduced from 2+ to 1+ causing colour change
Explain how a resistant parasite population is likely to arise and limit the life of any new anti malarial drug?
The parasite has mutated against drug
Changed DNA base sequence/proteins or codes for
Expresses different antigens
Resistant ones are able to reproduce and pass on resistance allele
How to treat a control group
Treat the same as experimental group but without drug that testing
Explain why Maltase only breaks down maltose/allows the reaction to take place at normal body temperature
It has a tertiary structure (maltose) means that it has an active site complementary to the shape of maltose and they will therefore bind to form an enzyme-substrate complex
This reaction requires no activation energy as the enzyme acts as a catalyst. It works best at body temperature
Role of nucleolus
Produces rna and protein subunits for a ribosome
Where it leaves the nucleus via a nucleus pore to go to RER
How a tadpoles tail is absorbed/produced to a frog
Produces lysosomes
Bacteria v eukaryotic cell
Has circular DNA
No nucleus
No membrane bound organelles
Small ribosomes
Advantage of mitochondria being no more than 1 micrometer in width
Bigger surface area to volume ratio
Test for non-reducing sugar
Grind sample Benedictus Reagan’s Heat for 5 mins Add acid Red colour
Describe how you would use a microscope to find the mean diameter of triglyceride drooled on a slide
Use a ruler to estimate the field diameter under microscope How many droplets go across the field Record a mean average and repeat Eyepiece graticule Calibrate with stage micrometer
