(Original post by Paul_Garcia)
Topics in AS Biology Paper 1 2018
Thursday 24th may
Naming the labels of Heart
Naming the artery between the heart and the muscles - coronary artery
Emulsion test for lipids: ethanol + water
Drawing mitochondria and labelling the crista and the matrix + a DNA nucleotide
Explaining how Lactulose a reduces constipation dry and hard faeces even though it cannot be digested or absorbed by the small intestine - in terms of water potential.
2 similarities between Lactose and Lactulose - sim galactose - diff glucose in lactose and fructose in lactulose.
Amount of bacteria left in petri dish if they divide every 30 minutes and there is variable number x10 to the power of something of bacteria living on slide D, how much grows after 6 hours.
Explaining how Oxygen gets to the blood after entering the alveoli.
Semi conservative replication how long tmRNA take to replicate if the its replicates at 50 nucleotides per second and the second strand beings the replicate after the first strand is ⅔ in replication. 33000- 66000 seconds.
Suggesting why 2 birds of different species could be similar (ancestor) By analysing a Figure where both use courtship to mate with a female bird by singing a sine and pulsing song.
Explaining why 2 female birds singing to each other would not mate - recognise gender/ not call and response
Stating the 2 products of ATP after it is catalyzed by ATP Hydrolase
What happens to mRNA after entering cytoplasm Not including transcription or splicing.
Investigating the effect of ATP conc on the contraction of muscles given by the length of the muscle cells.
Naming a taxon in a phylogenetic classification
Explaining why the figure is an example of a phylogenetic classification
Explaining 1 Adaptation of the alveoli for efficient gas exchange
Giving 2 Control variables other than the ones given
Defining what a proteasome is
Description and Explanation of the results of the investigation
Reading a passage and Explaining the swelling of the small intestine due to the release of cytokines by T cells as they detect pathogenic bacteria through their receptors binding on their foreign antigens.
Evaluating a statement by a politician by banning smoking in a car for people under 18 analysing the Graph/ figure for standard deviations, overlaps in smoking and the toxin is causes
Explaining in terms of mutations why 5MAH is not enough to stop the swelling in the small intestine in terms of pathogenic resistance to this drug, and why a 6MSH drug enzyme inhibitor (preventing A and G production in DNA as t helper cells cannot recycle nucleotides) is needed also.
Explaining what is meant by people with ‘genetic tendencies’ in terms of mutations etc.
How much joules of energy of ATP are used in muscular contraction if 60% is released as heat.
So im guessing Paper 2 may cover these topics but not limited to:
Translocation/ Transpiration Mass flow & Active loading
The immune system
Membrane structure (e.g. Fluid Mosaic Model)
ELISA test and HIV
DNA replication meiosis/ mitosis
Gas exchange (in fish, in humans)*
Student t test
Regulation of gene expression (methylation/acetylation)