Lec 6+7

Question 1

contain one or more activated atoms of oxygen but are not necessarily radicals. H2O2 is not a radical.

Answer 1

ROS

Question 2

are any chemical species that exist independently and contain unpaired electron(s).

Answer 2

Free radicals

Question 3

Both ROS and free radicals can induce oxidative stress
through ……….

Answer 3

oxidation of cell compounds.

Question 4

A physiological response (physiological state) induced by over-production and accumulation of ROS is known as

Answer 4

oxidative stress

Question 5

High concentration of ….. is one of the oldest ‘stresses’ on the planet for living systems

Answer 5

ROS

Question 6

Formation of ……….. from O2 is a critical phenomenon for free radical biology of all plant species.

Answer 6

superoxide

Question 7

is the moststable ROS

Answer 7

Hydrogen peroxide (H2O2 )

Question 8

lifetime of H2O2 in living tissues is still
short due to?

Answer 8

activities of catalases and peroxidases

Question 9

• extremely short-living ROS,
• a key cause of oxidative stress, damaging all biomolecules

Answer 9

Hydroxyl radical (•OH)

Question 10

Formation of it, is related to rearrangement of the electron in O2 molecule, making this one much more reactive

Answer 10

singlet oxygen

Question 11

are the most abundant group of organic molecules in plants

Answer 11

carbohydrates