CBSE > Class 12 > Biology | CBSE Board | Homework Help

Polymerase chain reaction, or PCR, is a laboratory technique used to make multiple copies of a segment of DNA. PCR is very precise and can be used to amplify, or copy, a specific DNA target from a mixture of DNA molecules. PCR is based on three simple steps required for any DNA synthesis reaction: (1) denaturation of the template into single strands; (2) annealing of primers to each original strand for new strand synthesis; and (3) extension of the new DNA strands from the primers. Hope...!! this will helps u....

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Project on Reproductive Infectious Diseases

Posted by Tejas Verma 4 years, 11 months ago

CBSE > Class 12 > Biology

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How would you find out the genotype of a pea plant with violet flowers? Explain with the help of Punnets’ square showing crosses.

Posted by Fareeha Shameen 4 years, 11 months ago

CBSE > Class 12 > Biology

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What is the work of outer ear part else from collecting sound vibration

Posted by Pranav Kadyan 4 years, 11 months ago

CBSE > Class 12 > Biology

1 answers

Pranav Kadyan 4 years, 11 months ago

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How is a cancerous cell different from a normal cell?

Posted by Sanu ? 5 years ago

CBSE > Class 12 > Biology

2 answers

Manish Yadav 4 years, 11 months ago

They Do Not show Contact Inhibition

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Jabir Khan 5 years ago

Cancerous cell possess a special property of metastasis, due to this the cancerous cell undergo uncontrolled cell division In this way it is different from normal cell

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Investigatory project of different sleeping habit and disorder

Posted by Harshu Soccer 5 years ago

CBSE > Class 12 > Biology

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What is *** molecular

Posted by Rohit Njhvh 5 years ago

CBSE > Class 12 > Biology

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Nidhi Kashyap?? 4 years, 11 months ago

Question to pura likho

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Sanu ? 5 years ago

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Is there anyone who have completed with their final board practical class 12th???

Posted by Aditya Choudhery 5 years ago

CBSE > Class 12 > Biology

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Rohit Njhvh 5 years ago

Site to aaj se open hui h ...abhi se Pehle kha ho jaege complete?‍♀️?‍♀️?‍♀️

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Tanya ?? 4 years, 11 months ago

Site to aaj se open hui h ...abhi se Pehle kha ho jaege complete?‍♀️?‍♀️?‍♀️

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Explain the mode of action of Cu++ releasing IUDs as a good contraceptive. How is hormone-releasing IUD different from it?

Posted by Saurabh Verma 5 years ago

CBSE > Class 12 > Biology

2 answers

Tushar Bhardwaj 4 years, 11 months ago

Cu realising IUD makes sperms lose their motality

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Shashank Bohra 5 years ago

Cu restricts motility of sperm and also make it infertile!!

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Two children one with blood group ‘AB’ and other with blood group ‘O’ are born to parents, where the father has blood group ‘A’ and the mother has blood group ‘B’. Work out a cross to show how is it possible

Posted by Saurabh Verma 5 years ago

CBSE > Class 12 > Biology

1 answers

Dhruv Kumar 5 years ago

Father's blood group =iA iO Mother's blood group=iB io IA io × IB iO iAiB iAiO iBiO iOiO AB A B O Hence a the child's boodgroup could be A B AB or O.

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Explain the relationship of ribosomes, t-RNA and m-RNA during the process of translation in Prokaryotes.

Posted by Saurabh Verma 4 years, 4 months ago

CBSE > Class 12 > Biology

1 answers

Sia ? 4 years, 4 months ago

During the process of translation in prokaryotes, amino acids are activated in the presence of ATP and they are linked to their aminoacylation of tRNA, as ribosome is the cellular factory for protein synthesis which exists as two subunits for the initiation and this small subunit of ribosome binds to mRNA at the start codon that is AUG. Then it is recognised by initiator t-RNA, large subunit has two sites for subsequent amino acids to bind to each other with a peptide bond. Then it proceeds towards the elongation process where charged tRNAs sequentially bind to the appropriate codon in mRNA, by forming complementary base pairs with the tRNA anticodon. Then ribosome moves codon by codon along with the m-RNA, and amino acids are added one by one, at the end, a release factor binds to the stop codon which can be UAA / UAG / UGA for terminating the translation.

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What is water sample of pond water

Posted by Kushra Mishra 5 years ago

CBSE > Class 12 > Biology

1 answers

Shagun Singh 5 years ago

125 to 150ml

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What is spermiogenise

Posted by Arjun Vl 5 years ago

CBSE > Class 12 > Biology

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Preeti Kannaujiya 4 years, 11 months ago

Maturation of spermatids to spermatozoa

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Sweta Trivedi 4 years, 11 months ago

The transformation of spermatids into spermatozoa is known as spermiogenesis

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Hardeep Kaur 5 years ago

It is spermiogenesis that is convertion of spermatids to spermatozoa

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Shagun Singh 5 years ago

It's not sprmiogenise it is spermiogenesis - it is a final stage of spermatogenesis which sees the maturation of spermatids into mature spermatozoa

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How to make project file on aids

Posted by Arsalan Rabbani 5 years ago

CBSE > Class 12 > Biology

1 answers

Shagun Singh 5 years ago

Front pg, acknowledgment, certificate,yours name ,class,rollno , subject,teacher name write about aids in introduction,then at last bibliography

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Define gene cloning and gene transfer.

Posted by Anne Elizabeth Thomas 5 years ago

CBSE > Class 12 > Biology

1 answers

Shagun Singh 5 years ago

Gene cloning is also called molecular cloning refers to the process of isolating of DNA sequence of interest , the recombinant DNA can be inserted into another cell such as bacterial cell for amplification

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Any biology class 12th cbse students here??

Posted by Aditya Choudhery 5 years ago

CBSE > Class 12 > Biology

5 answers

Shagun Singh 5 years ago

Yes

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Sweta Trivedi 5 years ago

Yes

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Sanu ? 5 years ago

Yess

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Tanya ?? 5 years ago

Yss

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Simran Kaur 5 years ago

Yes I am

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Pils of conta

Posted by Md Amjad 5 years ago

CBSE > Class 12 > Biology

1 answers

Shagun Singh 5 years ago

It is also called contact cold medicine,this is also contain a non -olpoid cough suppresent

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What is insertional inactivation? (Chapter-11)

Posted by Jass . 5 years ago

CBSE > Class 12 > Biology

2 answers

Shagun Singh 5 years ago

It is teachnique used in recombinant DNA engeneering where a plasmid(pbr 322)is used to disable expression of a gene

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Nidhi Prajapati 5 years ago

Due to insertion of recombinant DNA the gene that produce beta galactosidase becomes inactive.This result is known as insertional inactivation.

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Causes and features of down syndrome

Posted by Dhanalakshmi Dharani 15 5 years ago

CBSE > Class 12 > Biology

2 answers

Shagun Singh 5 years ago

It is happen due to trisomy ( many no of copies) some children with down syndrome and major heart defect will happen with heart failure , difficulty of breathing ect

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Poorvi Yadav 5 years ago

It causes due to trisomy(additional copy) of chromosome no 21. In this the affected person will be short and statured having rounded head,broad palm with characterised creases ,having partially opened mouth and will be physically ,physymotor and mentally retarded

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Name two sexually transmitted diseases?

Posted by Tahreem Gufran Tahreem Gufran 5 years ago

CBSE > Class 12 > Biology