Question

1.

What uses receptor sites and natural body substances, to kill only cancer cells?

Riboflavin and B12 capsules

Stem Cell Injections

Targeted Drug Delivery

Metabolic site injections

2.

Which of the following is the quality of polyester

It is made from equal amounts of two different monomers.

It is used to make bottles and fabrics

It becomes plasticine when heated.

Both A and B

3.

which of the following is not true about crystalline polymers?

Areas in polymer where chains packed in regular way.

Both amorphous and crystalline areas in same polymer.

Heating or dehydrating is used to activate the monomers and dry out the esters to form bonded chains

Crystalline is a regular chain structure.

Answer 1

(1)  

The stem cell transplant for the treatment of cancer uses high doses of chemo along with radiation therapy sometimes. Such treatment may also kill the stem cells present in the bone marrow. Thus, stem cell injections does not use natural body substances and receptor sites to kill only cancer cells.

The development of drug delivery vehicles aims to escort drugs to the specific sites of therapeutic action and reduce the harmful side effects. Thus, target-specific drug delivery avoids the damage to the other cells and destroy the harmful cells that may spread or invade to other body parts and deliver drugs to destroy cancerous cells under NIR (near-infrared) laser irradiation.

Hence, the option (c) is correct because Targeted Drug Delivery uses receptor sites and natural body substances, to kill only cancer cells.

(2)

A polyester is made from two different monomers- a 'diol' that contains two alcohol (-OH) groups and a 'dicarboxylic acid' that contains two carboxylic acid (-COOH) groups.

Plastic bottles are formed from PET (polyethylene) which is a type of polyester that is involved mostly with a fabric that is used in interiors and clothing. Thus, polyester is used to make bottles and fabrics.

Hence, the option (d) is correct.