Miscellaneous — 27 Biology PYQs with Answers | UKPSC PYQ Hub

Question 1

Organisms which grow best in the temperature range of 0-15°C are referred to as:

Accepted Answer

Psychrophiles. Psychrophiles are organism that can grow at a temperature range of 0-15 degree Celsius. They can grow even at temperature below o and hence are significant contributors to food spoilage even on refrigeration.

Question 2

The hybridoma technique was developed by?

Accepted Answer

George Kohler and Cesar Milstein. Georges J.F. Kohler and Cesar Milstein were awarded the 1984 Nobel Prize in Physiology or medicine for producing monoclonal antibodies in 1975.

Question 3

Food cans are coated with Tin instead of Zinc, because:

Accepted Answer

Zinc is more reactive than Tin.. Food cans are coated with tin instead of zinc because zinc is more reactive than tin. • Zinc is more reactive than tin and can react with the acids in food, which can cause food poisoning. Tin on the other hand, is less reactive and can preserve food better.

Question 4

Which one of the following pairs is not correctly matched?

Accepted Answer

Ebola Virus – Small Pox. Ebola virus and smallpox are not related. small pox is caused by variola virus. The other pair are correctly matched.

Question 5

Outer covering of virus, which is made up of protein, is known as

Accepted Answer

Capsid. A virus is made up of a core of genetic material which is surrounded by capsid. The capsid is a protein sheet which surrounds the virus and is composed of a finite number of protein subunits known as capsomeres. The capsid has three functions. It protects the nucleic acid from digestion by enzymes. It contains special sites on its surface that allow the virion to attach to a host cell. Capsid also provides proteins that enable the virion to penetrate the host cell membrane.

Question 6

Enzymes are basically–

Accepted Answer

Protein. Enzymes are proteins which help to catalyze the biochemical reaction. The enzyme has a protein part which is not active is known as apoenzyme. Basically, the enzymes are composed of proteins. These consist of the one or more number of polypeptide chains which entangle to form a complete enzyme. The enzyme has an active site where the substrate binds and gets converted into a product after reacting with the particular species of molecules.

Question 7

The causes of poisoning of food is presence of–

Accepted Answer

Esherichia Coli. The cause of poisoning of food is presence of Escherichia coli. Escherichia coli and other coliform bacteria are important food-borne pathogens. Some of the most important sources of contamination for these groups of microorganisms are reported as: areas with unfavorable hygiene, contaminated waste water, meat products, cereal products and vegetables. Total coliform bacteria and E. coli count is known to be the indicator of unfavorable hygienic conditions and fecal contamination in foods.

Question 8

Who discovered blood groups?

Accepted Answer

Landsteiner. Karl Landsteiner discovered blood group system in (1901) and is also known as the 'father of blood grouping and immunology'. Human blood groups are of four types i.e., A, B, O, and AB type.