What is true about free radicals?
The body is under constant attack from oxidative stress. Oxygen in the body splits into single atoms with unpaired electrons. Electrons like to be in pairs, so these atoms, called free radicals, scavenge the body to seek out other electrons so they can become a pair. This causes damage to cells, proteins and DNA.
What is not true about free radicals?
Which statement about free radicals is NOT true? Free radicals are molecules with unpaired electrons, making them highly reactive. High levels of free radicals alter DNA and destabilize membranes. Free radicals generated by energy metabolism are not useful to the body.
What do free radicals do?
Free radicals are oxygen-containing molecules with an uneven number of electrons. The uneven number allows them to easily react with other molecules. Free radicals can cause large chain chemical reactions in your body because they react so easily with other molecules.
How are free radicals formed quizlet?
Highly unstable atoms, molecules or complexes with one or more unpaired electrons, resulting from electron loss during oxidation. … Homolytic fission, or equal splitting of covalent bonds result in production of free radicals, because they produce a molecule or molecular fragment with an unpaired electron.
Which of the following may protect against free radicals?
Antioxidants, such as vitamins C and E and carotenoids, may help protect cells from damage caused by free radicals. Other naturally occurring antioxidants include flavonoids, tannins, phenols and lignans. Plant-based foods are the best sources.
What are free radicals examples?
A notable example of a free radical is the hydroxyl radical (HO•), a molecule that is one hydrogen atom short of a water molecule and thus has one bond “dangling” from the oxygen.
Where are free radicals produced?
Production of free radicals in the human body Free radicals and other ROS are derived either from normal essential metabolic processes in the human body or from external sources such as exposure to X-rays, ozone, cigarette smoking, air pollutants, and industrial chemicals.
Why are free radicals a problem quizlet?
The problem is, free radicals often injure the cell, damaging the DNA, which creates the seed for disease. When a cell’s DNA changes, the cell becomes mutated. … When cells create energy, they also produce unstable oxygen molecules. These molecules, called free radicals, have a free electron.
What does a free radical have quizlet?
What is a free radical? Highly reactive chemical species with an unaired electron in the other orbit (valence shell) of the molecule. They are unstable and highly reactive.
How are free radicals produced give example?
Where do free radicals come from? Free radicals and other ROS are either derived from natural, essential metabolic processes in the human body or from external sources such as X-ray exposure, ozone, cigarette smoking, air pollution, and industrial chemical substances.
How are free radicals formed?
A molecule with one or more unpaired electron in its outer shell is called a free radical (1-5). Free radicals are formed from molecules via the breakage of a chemical bond such that each fragment keeps one electron, by cleavage of a radical to give another radical and, also via redox reactions (1, 2).
What are free radicals in chemistry?
A free radical can be defined as an atom or molecule containing one or more unpaired electrons in valency shell or outer orbit and is capable of independent existence. The odd number of electron(s) of a free radical makes it unstable, short lived and highly reactive.
What are free radicals in chemistry class 11?
A free radical may be defined as an atom or a group having an odd or unpaired electron. These are generally produced by homolytic cleavage of a covalent bond.
What are neutral radicals?
radical, also called Free Radical, in chemistry, molecule that contains at least one unpaired electron. … Although free radicals contain unpaired electrons, they may be electrically neutral. Because of their odd electrons, free radicals are usually highly reactive.
What are free radicals which is the most stable free radical and why?
Allyl radical is in turn less stable than benzyl free radical. Therefore, the most stable free radical is benzyl free radical. Hence the correct option is (B).
What are radicals in chemistry class 9?
In chemistry, a radical is an atom, molecule, or ion that has at least one unpaired valence electron. With some exceptions, these unpaired electrons make radicals highly chemically reactive.
What is free radical answer?
Free radicals are atoms or molecules with an odd (unpaired) number of electrons. They can be formed when oxygen interacts with certain molecules.
What are radicals in chemistry class 7?
Radicals : A radical is an atom of an element or a group of atoms of different elements that behaves as a single unit with a positive or negative charge on it.