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Subject: Biology, asked on 14/10/22


Explain Stirred tank bioreactors. Besides better aeration and mixing properties, what other advantages do stirred tank bioreactors have over shake flasks?

Subject: Biology, asked on 30/7/22

How are sticky ends formed on a DNA strand? Why are they called so? 
 

Subject: Biology, asked on 22/7/22

Explain any three vector-less methods that are used to introduce recombinant DNA into a competent host cell.

Subject: Biology, asked on 21/7/22

what is PCR? Explain the steps with the help of a diagram.

Subject: Biology, asked on 18/7/22

Q195) Which one of the following features are not true for chordates ?

( a ) Heart is dorsal .
( b ) Pharynx is perforated by gill slits .
( c ) Central nervous system is ventral , solid and single .
( d ) Post - anal tail is present .
( e ) Notochord is present .

Choose the most appropriate answer from the options given below : ( 1 ) ( a ) , ( d ) and ( c ) only ( 2 ) ( b ) and ( c ) only
( 3 ) ( a ) and ( c ) only
( 4 ) ( e ) only

Subject: Biology, asked on 18/7/22

Q192) Given below are two statements : one is labelled as Assertion ( A ) and the other is labelled as Reason ( R ) .

Assertion ( A ) : The nematode can not survive in a transgenic host which expresses specific interfering RNA .

Reason ( R ) : Nematode specific gene introduced in the host produces both sense and antisense complementary RNA which initiate RNA interference in the host cell .

In the light of the above statements , choose the most appropriate answer from the options given below :

( 1 ) ( A ) is not correct but ( R ) is correct

( 2 ) Both ( A ) and ( R ) are correct and ( R ) is the correct explanation of ( A )

( 3 ) Both ( A ) and ( R ) are correct but ( R ) is not the correct explanation of ( A )

( 4 ) ( A ) is correct but ( R ) is not correct

Subject: Biology, asked on 18/7/22

Q191) Identify the properties of a good vector used in rDNA technology . ( a ) It should have origin of replication supporting high copy number .
( b ) It should have preferably more than '2' recognition sites .
( c ) The restriction sites in vector should be in the antibiotic resistant genes . ( d ) It should have suitable marker genes .
( e ) It should be easy to isolate and purify .

Choose the most appropriate answer from the options given below : ( 1 ) ( c ) , ( d ) and ( c ) only

( 2 ) ( a ) , ( b ) and ( c ) only

( 3 ) ( a ) , ( c ) , ( d ) and ( e ) only

( 4 ) ( a ) , ( c ) and ( e ) only

Subject: Biology, asked on 18/7/22

Q153) In Drosophila , the genes for color of body and color of eyes are situated on __________.
( 1 ) autosomes
( 2 ) Y - chromosome
( 3 ) X - chromosome
( 4 ) both the sex chromosomes

Subject: Biology, asked on 18/7/22

Q152) Inadequate supply of oxygen to heart muscles leads to a symptom of acute chest pain . This disorder of the circulatory system is identified as : ( 1 ) Cardiac arrest
( 2 ) Heart failure
( 3 ) Coronary Heart Disease
( 4 ) Angina pectoris

Subject: Biology, asked on 18/7/22

Q148) Which of the following set represents the correct labelling of A , B , C and D with respect to the given diagram ?

( 1 ) A - Seed Coat , B - Scutellum , C - Endocarp , D - Mesocarp

( 2 ) A - Seed Coat , B - Scutellum , C - Micropyle , D - Endocarp

( 3 ) A - Pericarp , B - Coleoptile , C - Endosperm , D - Scutellum

( 4 ) A - Seed Coat , B - Cotyledon , C - Endosperm , D - Hypocotyle

Subject: Biology, asked on 18/7/22

Q130) In prophase I of Meiosis , chromosomes start pairing together and synapsis takes place . This process occurs during which of the following stage ?
( 1 ) Diplotene
( 2 ) Leptotene
( 3 ) Zygotene
( 4 ) Pachytene

Subject: Biology, asked on 18/7/22

Q125) Which of the following statements about facilitated diffusion is incorrect ?
1 ) Porins are involved in this process .
2 ) Movement of molecule occurs against the concentration gradient .
3 ) ATP is not required for this process .
4 ) Special proteins of the membrane help in this process

Subject: Biology, asked on 18/7/22

Q123) What will be the ploidy of endosperm of a seed produced after crossing tetraploid female plant with tetraploid male plant ?
( 1 ) Hexaploid
( 2 ) Diploid
( 3 ) Triploid
( 4 ) Pentaploid

Subject: Biology, asked on 18/7/22

Given below are two statements : one is labelled as Assertion ( A ) and the other is labelled as Reason ( R ) .

Assertion ( A ) : The growth of multicellular organism is due to mitosis .

Reason ( R ) : Mitosis is also called as equational division and it offers genetic stability .

In the light of the above statements , choose the correct answer from the options given below :

( 1 ) ( A ) is not correct but ( R ) is correct

( 2 ) Both ( A ) and ( R ) are correct and ( R ) is the correct explanation of ( A )

( 3 ) Both ( A ) and ( R ) are correct but ( R ) is not the correct explanation of ( A )

( 4 ) ( A ) is correct but ( R ) is not correct

Subject: Biology, asked on 18/7/22

Q111) Match List-I with List-II

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