Daily NEET MCQ- May 2, 2022 - NEET MCQ

In one average life, i.e. at 7 hours, 63.2 % of the active nuclei will decay. Therefore, in a time of 7 hours, it can be considered that more than half of the active nuclei will decay.

Dettol, tincture of iodine and iodoform are common antiseptics that are directly applied on wounds to treat them. Boric acid is prepared as a dilute aqueous solution and acts as an antiseptic for the eyes.

Bithionol consists of two dichloro and dihydroxy substituted aromatic rings connected by a sulphur bridge. It is added to soaps as an antiseptic. It also helps to reduce the smell produced by microbial decomposition on the skin.

Antimalarials and antibiotics are ingested in the form of pills. Antiseptics are applied on the skin. Disinfectants are used for cleaning objects like floors, toilets, drains, etc. and protect them from pathogenic activity.

Transformation is a process in which a foreign DNA is directly picked up by the bacteria from the surrounding environment. It leads to a change in the characteristics of bacteria. It was first observed by Griffith in 1928.

Antibiotics are the substances that either inhibit the growth or kill bacteria. They are widely used to treat diseases caused by bacteria. Some examples of antibiotics are kanamycin, ampicillin, penicillin, tetracycline, etc.

Insertional inactivation is the process in which the gene is inactivated due to the insertion of other genes within it or within its coding sequence. This leads to loss of function of that specific gene. Thus, insertion of recombinant DNA within the gene encoding for β–galactosidase will lead to insertional inactivation.

Recognition site is the sequence of DNA where the DNA is cleaved. The presence of more than one recognition site will lead to several cuts within DNA leading to fragmentation of DNA. This will complicate the process of gene cloning.

Agrobacterium tumifaciens is the bacteria which transfers ‘T-DNA’ within plants. It mostly infects dicot plants. This ‘T-DNA’ is responsible for the formation of transformed cells called tumors from normal plant cells.

Compound is a combination of two or more elements in a fixed ratio. Element is made up of the same atoms. Atom is the basic unit of life. Ion is either positively or negatively charged.