Role of organelles in the oxidative stress | Baamboozle - Baamboozle

English 19 Public

Oxidative stress

Study Slideshow

Mitochondria play an essential role in oxidative stress because they are responsible for the primary generation of

Superoxide radicals

15

The________________ is a pivotal organelle in cell metabolism and participates in modifying, sorting, and packaging macromolecules for cell secretion or use within the cell.

The Golgi apparatus (GA)

15

In healthy cells, ROS/RNS are produced at High levels, and any damage they cause is commonly repaired; therefore, they usually exist in equilibrium with antioxidants that scavenge ROS/RNS and prevent tissue injury.

False

15

Oxidative stress has generated significant interest primarily because it is a major contributor to the etiology of severe pathologies, and reactive oxygen species (ROS)/reactive nitrogen species (RNS) are involved in the physiological respo

True

15

When the production of free radicals or their products exceeds the capability of the antioxidant defense mechanisms, the formation of ROS/RNS increases, which damages biological molecules and initiates a cascade of events that result in

Oxidative stress

15

Lysosomes contain high concentrations of redox- active iron that can catalyze the homolytic splitting of hydrogen peroxide, which produces the extremely reactive hydroxyl radical by

The Fenton reaction

15

The _______________ is the endomembrane system that is distributed in a network within the cell and can be subdivided into the ribosome-bound “rough” ER (RER) and the ribosome-non-bound “smooth” ER (SER).

Endoplasmic reticulum

15

Supply cellular energy ATP through the TCA cycle and oxidative phosphorylation (OXPHOS)

Mitochondria

15

Is a subnuclear membranless organelle that primarily functions as a biosynthetic site for the 40S and 60S ribosome precursors

The nucleolus

15

Some of the reduction products of oxygen are of a free-radical nature, having a free electron

The superoxide anion radical and the hydroxyl radical

15

Some of the reduction products of oxygen, having two free electron, is not a radical

Hydrogen peroxide

15

Electronically excited states of the reduction products of oxygen, which are also nonradicals.

Singlet molecular oxygen and excited carbonyl compounds

15

Biologically important reactive species are chlorine and bromine species

Hypohalous acids, hypochlorite, and chloramines

15

Nitric oxide, nitrogen dioxide, peroxynitrite, and nitrite/nitrate are reactive species of

Reactive nitrogen species (RNS)

15

Forms of cysteine and methionine, plus some low-molecular-mass compounds such as glutathione, trypanothione, or mycothiol are

Reactive sulfurs species

15

___________include various forms of metabolically generated aldehydes and electronically excited (triplet) carbonyls

Reactive carbonyl species (RCS)

15