EduNinjaScientists are researching new ways to reduce the global atmospheric carbon dioxide ( ) concentration. There are concerns that an increasing atmospheric concentration may lead to effects that decrease biodiversity.
Intermediate products of the Calvin cycle are needed to produce organic molecules for use by the cell.
Describe how these organic molecules are used by cells.
GP (PGA) and TP (triose phosphate) are intermediates of the Calvin cycle of the light independent stage. Some GP and TP are used for the synthesis of organic compounds.
Name a polysaccharide synthesised as a result of TP production.
Name the additional element that is required for the production of amino acids from Calvin cycle intermediates.
Some Calvin cycle intermediates are used to produce other molecules that are not part of the Calvin cycle.
Name two of these intermediates.
For each intermediate, state one example of the type of molecule that is produced.
intermediate
molecule produced
intermediate
molecule produced
Pitcher plants are carnivorous plants that trap and digest insects in a large modified leaf called a pitcher.
Fig. 6.3 shows a pale pitcher plant, Sarracenia alata.
Fig. 6.3
Pitcher plants grow in bogs and wet grassland where the soil has a low concentration of minerals such as nitrates. The plants obtain nitrates from the digestion of insects.
Calvin cycle intermediates are used to synthesise more complex compounds, some of which need nitrogen from nitrates.
Name one compound that needs nitrogen from nitrates and name the Calvin cycle intermediate from which it is synthesised.
compound that needs nitrogen
Calvin cycle intermediate
Question 7 starts on page 22.
Fig. 8.2 shows an outline of the Calvin cycle.
Fig. 8.2
TP molecules that are not involved in the regeneration of RuBP can be used in the synthesis of other molecules.
State two molecules that can be produced from these TP molecules.
Fig. 7.1 outlines some of the events in the process of photosynthesis in a chloroplast.
Fig. 7.1
Most of the triose phosphate produced in the light independent stage is used to regenerate RuBP so that the Calvin cycle can continue. Some of the triose phosphate is used to make other organic compounds with a range of functions.
State three different functions of these other organic compounds in a plant cell and give one example of an organic compound for each function.
function
compound
function
compound
function
compound
Outline the uses of triose phosphate in the mesophyll cells of the leaf.