The importance of nitrogen-containing substances in biological systems - Answer-- nucleic acids
- DNA replication
- ATP
- ribosomes
- nitrogen-cycle
- digestion and absorption
- transport across cell membranes
- cell division
- mutation
- control of gene expression
The importance of diffusion in organisms - Answer-- transport across membranes
- gas exchange alveoli/fish countercurrent system
- digestion and absorption
- mass transport
- photosynthesis
- respiration
- homeostasis
- synaptic transmission
- nerve impulses
- muscle contractions
Importance of specific structures in organisms - Answer-- enzymes / metabolic reactions
- glucose/starch/cellulose
- plasma membranes and transport across and absorption
- immune response / monoclonal antibodies
- DNA / protein synthesis
- receptors
- nerve impulses / synapses
- muscle contraction
- feedback systems / oestrogen / hormones
- control of heart contractions
- gene expression and therapy
- haemoglobin
The importance of ions in biology - Answer-- phosphates / phospholipids / ATP / nucleotides /
DNA / RNA
- co-transport using sodium ions
- resting potential / action potentials
- synapses / calcium ions
- muscle contraction / calcium ions
- protons in photosynthesis / respiration
- reduced NADP, NAD, FAD
- fertilisers
- pacinian corpsucles
- nitrogen cycle
- genetic fingerprinting / electrophoresis