Year 9 Flashcards
Where is the site of aerobic respiration
The mitochondria
Define diffusion
Net movement of particles from a region of high concentration to a region of low concentration down a concentration gradient as a result of the particles random movement
How are plants supported
-thick lignified cell wall of xylem vessels
Turgour pressure within cells causes a water pressure acting outwards against the inelastic cell wall
Two sites of active transport
Uptake of ions in root hair cells
Uptake of glucose by the epithelial cells of the villi
What is required to move molecules across a membrane by active transport
ATP from mitochondria when they respire
Transport protein
How are protein molecules different
Different sequences of amino acids lead to proteins with different shapes, active sites, antigens and purposes
Why are enzymes necessary in all living. Organisms
They increase the rate of biological processes to the level where it is possible to sustain life
What is the action of chlorophyll
Turns light energy into chemical energy in molecules
How are conditions made optimum in greenhouses
Attempt to reduce the level at which a limiting factor is present, carbon dioxide enrichment optimum light and temperature
Nitrate ions
Make amino acids
Deficiency leads to pale leaves all over, short plants, small root structure
Importance of magnesium ions for plants
Used to make chlorophyll
Deficiency causes pale drying leaves at the top and healthy leaves at the bottom
