IMPORTANT TOPICS FOR NET/JRF LIFESCIENCE EXAMINATION

Hello friends,
you know the NET EXAM date is announced and exam will be held in December month.

In this article I teach you miner skills to attempt the question paper.I you it will be helpful for you. I know some students has low perpetration but don't be worried some miner and quick tricks will be helpful for you.
CLICK here to buy best book for NET EXAM-
BUY BEST BOOK FOR NET/JRF EXAMINATION 2015
The important topics are-
1.Mostly I see that students left there lot of time in question study.I want to tell you that don't get nervous at exam time firstly choose the questions which are belongs to your well prepare topic.Read question 2 time and then select your answer.
2.If you don't complete your foll syllabus please read genetic and cell biology topics properly because these are important topics and many questions are belong to these topics.
3.Solve mind game questions because PART C of NET EXAM has special questions.
4.Solve previews year question papers.this  I suggest you Objective Life Science: MCQs for Life Science Examination (CSIR, ICAR, DBT, ASRB, IARI, NET, SET)2015 

 5.DNA replication and acids effect on cells are very important topics.
6.Applied zoology based questions are important.
7.Ask questions to me and I discuss the answer with description.
8.Special effects of amino acids, proteins are important points.on it helpful for you.
9.chromosome is important topic.
10.structural changes in chromosomes is very important for DEC. NET exam on this topic I will upload a video on this site h
If you have any other problem you can ask I try to give you a satisfied answer.

 My next capsule about genetic part will publish tomorrow please visit again.

CSIR-UGC NET/JRF LIFE SCIENCE EXAM.DECEMBER 2014 SOLVED PAPER WITH DESCRIPTION Q.NO. 86 to 90

click here for-
BUY BEST BOOK FOR NET EXAMINATION

Q86. The following graph represents the expression of Tryptophan Synthetase (TS) in E.coli cels in absence or presence of Tryptophan in the medium-

If the two trp codons in the leader sequence of trp operon is mutated to ala, which of the following graph will best represent activity of TS in E.coli cells grown in the absence or presence of tryptophan?

(A)

(B)

(C)

(D)

ANSWER-B

Description-42-45 nucleotide coding leader sequence(trpL) contains an attenuator site.

Att-Transcription termination loop.(3:4)

Q87.The lifetime of a peptide bond in protein is very large,which statement below is incorrect with respect to stability of peptide bond?

(A)free energy of hydrolysis is negative

(B)The free energy of hydrolysis is positive and large

(C)The energy barrier to be crossed to go to the hydrolysed state in the large

(D)The peptide bond can be hydrolysed by6N HCl at 100 degree C.

ANSWER-B

Description-Because peptide bond hydrolysis is a spontaneous process. so it have highly negative value.

Q88. Following are certain statements related to euckryotic DNA replication-

1.The genome of multicellular animals contain many potential origins of replication.

2. During early development, when embryos are undergoing rapid cell divisions origin sites are uniformly activated.

3.'Pulse-chase' technique is used to label sites of DNA replication.

4.The rate of elongation of different DNA chains during genome replication varies drastically.

Which one of the following combinations of above statements are correct?

(A)1,2 and 3

(B)1,3 and 4

(C)2,3 and 4

(D)1,2 and 4

ANSWER-A

Description-Because the size of Eukaryotic genome is very large so,it contains multiple ori, uniformly transcribed at each ori, during early development stages.

'Pulse-chase' technique is also used to label the sites of DNA replication.

Method was used to determine the existence and function of Okazaki fragments(DNA replication)

Q89.A researcher wanted to immunize individuals of a particular area with viral infections. The researcher developed two different vaccine types(A and B) with the following properties-

1.When vaccine type A specific for a viral strain is administered to individuals, they develop strong neutralizing antibody response with very poor immunological memory.Hence it has to be administered in repetitive doses.

2.When vaccine type B specific for a viral strain is administered to individuals, they fail to develop circulating antibody response at the time of infection but they develop strong immunological memory.

If two viral strain V1(incubation period-2 days) and V2(incubation period-15days) are likely to infect the area which of the following vaccine combination would provide maximum immunization?

(A)V1 specific type A and V1 specific type B

(B)V1 specific type A and V2 specific type B

(C)V2 specific type A and V1 specific type B

(D)V2 specific type A and V2 specific type B

ANSWER-B

Description-Type A specific type to viral strain, produces strong neutralizing Abs but very poor immunological memory.

Hence repetitive booster doses are required.

But type B vaccine is generating strong memory.

Therefore to control V1 viral strain and V2, a combination of type A and B vaccine should be beneficial.

Q90.The expression of a hypothentical gene was analysed by Northen and Westenbolt hybridizations under control and induced condition.The results are summarized blow-

Expression of gene can be regulated by-

1.control at transcription initiation

2.alternative splicing

3.control the translation initiation

4.protein stability

Which of the above regulatory mechanisms can explain the observations show in the figures?

(A)Only 2

(B)Only 1 and 2

(C)Only 2 and 3

(D)1,2,3 and 4

ANSWER-D

Description-Northern bolt hybridization-RNA

                   Western bolt hybridization-Protiens

Expressions of gene can be regulated at any of following stages-A,B,C and D.

FOR PREVIEWS 18-85 QUESTION ANSWERS CLICK HERE-

CSIR-UGC NET/JRF LIFE SCIENCE EXAM.DECEMBER 2014 SOLVED PAPER WITH DESCRIPTION Q.NO. 81 to 85