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....

0Thank You

ANSWER

Project on Reproductive Infectious Diseases

Posted by Tejas Verma 4 years, 6 months ago

CBSE > Class 12 > Biology

0 answers

ANSWER

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, 6 months ago

CBSE > Class 12 > Biology

0 answers

ANSWER

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

Posted by Pranav Kadyan 4 years, 6 months ago

CBSE > Class 12 > Biology

1 answers

Pranav Kadyan 4 years, 6 months ago

4Thank You

ANSWER

How is a cancerous cell different from a normal cell?

Posted by Sanu ? 4 years, 6 months ago

CBSE > Class 12 > Biology

2 answers

Manish Yadav 4 years, 6 months ago

They Do Not show Contact Inhibition

1Thank You

Jabir Khan 4 years, 6 months 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

6Thank You

ANSWER

Investigatory project of different sleeping habit and disorder

Posted by Harshu Soccer 4 years, 6 months ago

CBSE > Class 12 > Biology

0 answers

ANSWER

What is *** molecular

Posted by Rohit Njhvh 4 years, 6 months ago

CBSE > Class 12 > Biology

2 answers

Nidhi Kashyap?? 4 years, 6 months ago

Question to pura likho

0Thank You

Sanu ? 4 years, 6 months ago

0Thank You

ANSWER

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

Posted by Aditya Choudhery 4 years, 6 months ago

CBSE > Class 12 > Biology

2 answers

Rohit Njhvh 4 years, 6 months ago

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

0Thank You

Tanya ?? 4 years, 6 months ago

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

1Thank You

ANSWER

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 4 years, 7 months ago

CBSE > Class 12 > Biology

2 answers

Tushar Bhardwaj 4 years, 6 months ago

Cu realising IUD makes sperms lose their motality

0Thank You

Shashank Bohra 4 years, 6 months ago

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

0Thank You

ANSWER

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 4 years, 7 months ago

CBSE > Class 12 > Biology

1 answers

Dhruv Kumar 4 years, 6 months 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.

1Thank You

ANSWER

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

Posted by Saurabh Verma 3 years, 11 months ago

CBSE > Class 12 > Biology

1 answers

Sia ? 3 years, 11 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.

0Thank You

ANSWER

What is water sample of pond water

Posted by Kushra Mishra 4 years, 7 months ago

CBSE > Class 12 > Biology

1 answers

Shagun Singh 4 years, 7 months ago

125 to 150ml

1Thank You

ANSWER

What is spermiogenise

Posted by Arjun Vl 4 years, 7 months ago

CBSE > Class 12 > Biology

4 answers

Preeti Kannaujiya 4 years, 6 months ago

Maturation of spermatids to spermatozoa

0Thank You

Sweta Trivedi 4 years, 6 months ago

The transformation of spermatids into spermatozoa is known as spermiogenesis

0Thank You

Hardeep Kaur 4 years, 7 months ago

It is spermiogenesis that is convertion of spermatids to spermatozoa

0Thank You

Shagun Singh 4 years, 7 months ago

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

0Thank You

ANSWER

How to make project file on aids

Posted by Arsalan Rabbani 4 years, 7 months ago

CBSE > Class 12 > Biology

1 answers

Shagun Singh 4 years, 7 months ago

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

3Thank You

ANSWER

Define gene cloning and gene transfer.

Posted by Anne Elizabeth Thomas 4 years, 7 months ago

CBSE > Class 12 > Biology

1 answers

Shagun Singh 4 years, 7 months 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

1Thank You

ANSWER

Any biology class 12th cbse students here??

Posted by Aditya Choudhery 4 years, 7 months ago

CBSE > Class 12 > Biology

5 answers

Shagun Singh 4 years, 7 months ago

Yes

0Thank You

Sweta Trivedi 4 years, 7 months ago

Yes

0Thank You

Sanu ? 4 years, 7 months ago

Yess

1Thank You

Tanya ?? 4 years, 7 months ago

Yss

2Thank You

Simran Kaur 4 years, 7 months ago

Yes I am

2Thank You

ANSWER

Pils of conta

Posted by Md Amjad 4 years, 7 months ago

CBSE > Class 12 > Biology

1 answers

Shagun Singh 4 years, 7 months ago

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

1Thank You

ANSWER

What is insertional inactivation? (Chapter-11)

Posted by Jass . 4 years, 7 months ago

CBSE > Class 12 > Biology

2 answers

Shagun Singh 4 years, 7 months ago

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

0Thank You

Nidhi Prajapati 4 years, 7 months ago

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

0Thank You

ANSWER

Causes and features of down syndrome

Posted by Dhanalakshmi Dharani 15 4 years, 7 months ago

CBSE > Class 12 > Biology

2 answers

Shagun Singh 4 years, 7 months 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

0Thank You

Poorvi Yadav 4 years, 7 months 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

1Thank You

ANSWER

Name two sexually transmitted diseases?

Posted by Tahreem Gufran Tahreem Gufran 4 years, 7 months ago

CBSE > Class 12 > Biology