5C & D - Limiting factors of Photosynthesis and CRISPR

Question 1

What is a limiting factor in photosynthesis, and how does it affect the reaction?

Answer 1

A limiting factor is a reactant or condition that restricts the rate of photosynthesis when in short supply. Before point X, light is the limiting factor. After point X, factors like carbon dioxide or temperature may limit the rate (in light intensity and rate of photosynthesis graphs)

Question 2

how does wavelength of light affect photosynthesis

Answer 2

greatest
rate of photosynthesis occurs when a plant is exposed to violet or red light and that the
rate of photosynthesis is relatively low under green light

Question 3

how does the presence of inhibitors affect photosynthesis

Answer 3

In general, the presence of inhibitors lowers the rate of photosynthesis.
- competitive reversible inhibitors can be gradually overcome if the substrate
concentration is continually increased
- increasing substrate
concentration does not reduce the effect of irreversible inhibitors or reversible noncompetitive inhibitors.
- maximum possible rate of reaction is reduced
in the presence of irreversible inhibitors or reversible non-competitive inhibitors.

Question 4

CRISPR

Answer 4

detectable sequences of DNA that act as an adaptive immune system within prokaryotes
such as bacteria

Question 5

Cas 9

Answer 5

is an endonuclease that can cut and glue DNA back together.
Importantly, Cas9 can be instructed by CRISPR to target specific DNA recognition sites to
cut and join, altering the DNA

Question 6

main use of crispr cas9 in photosynthesis

Answer 6

By editing a crop’s genome, the efficiency of photosynthesis can be
improved by adjusting key factors in the process such as Rubisco or the photorespiration
pathway.