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Define pBR 322.

Posted by Pratibha Ydv 7 years, 2 months ago

CBSE > Class 12 > Biology

3 answers

Brahmjot Kaur 7 years, 2 months ago

This was the first artificial cloning vector constructed in 1977 by Boliver and Rodriguez. It is widely used in gene cloning experiments. NOMENCLATURE : In pBR 322 plasmid, p denotes that it is a plasmid; BR stands for Boliver and Rodriguez who constructed this plasmid ; 322 is a number given to distinguish this plasmid from others developed in the same laboratory. For example, there are plasmids pBR 325, pBR 327, pBR 328, pBR 345,etc.

Hy Shona 7 years, 2 months ago

Alia i hope my answer is right and satisfied

Hy Shona 7 years, 2 months ago

It is resistant to some anti biotici becoz it have resisting gene.therefore it act as selectable marker and help to identify recombinant and non recombinant dna

ANSWER

Name the inducer of lac operon

Posted by Shweta Kharwar 7 years, 2 months ago

CBSE > Class 12 > Biology

1 answers

Yogita Ingle 7 years, 2 months ago

Components of an operon :

(i) Structural genes : - The fragment of DNA which transcribe mRNA for polypeptide synthesis.

(ii) Promoter : - The sequence of DNA where RNA polymerase binds and initiates transcription.

(iii) Operator : - The sequence of DNA adjacent to promoter is called OPERATER.

(iv) Regulator gene : - It is the gene that codes for repressor protein which binds to operator due to which operon is switched ‘‘off’’

(v) Inducer : - Lactose is inducer which helps in switching ‘‘on’’ of operon. Lac operon consists of there structural genes (z, y, a), operator (o), promoter (p), regulatory gene

ANSWER

Can one complete the full biology syllabua of class 12 along with continuous study of other regular subjects including maths?

Posted by Kanwarjit Singh 7 years, 2 months ago

CBSE > Class 12 > Biology

1 answers

Hy Shona 7 years, 2 months ago

Yes but it tooks time.because bio is not so hard but physics ,chemistry,maths are not easy. So if youbwant to prepare all these subjects along with bio then it took time but not impossible. It will need much hard work Dear.so best of luck.

ANSWER

Bio

Posted by Ankit Kumar Ankit Kumar 7 years, 2 months ago

CBSE > Class 12 > Biology

1 answers

Hy Shona 7 years, 2 months ago

What is this ankit

ANSWER

Write briefly about restriction enzymes?

Posted by Suriya Sankar 7 years, 2 months ago

CBSE > Class 12 > Biology

2 answers

Hy Shona 7 years, 2 months ago

I hope answer is right mr shankar

Hy Shona 7 years, 2 months ago

Restriction enzyme are use to cut the dna segment.tey are of two types- Exonuclease enzyme-This enzyme generally add methyl group to dna. Endonuclease enzyme-This enzyme cut dna segment from a specific position

ANSWER

From where endoplasmic reticulum originate

Posted by Sahil Swami 7 years, 2 months ago

CBSE > Class 12 > Biology

1 answers

Yogita Ingle 7 years, 2 months ago

Endoplasmic Reticulum (ER) is a complex network of tubular membranes present within the cytoplasm of the eukaryotic cell, transpiring either with a smooth surface and therefore called as the smooth endoplasmic reticulum or studded with ribosomes and hence called the rough endoplasmic reticulum which is involved in the transportation of materials. These membranes are continuous, joining with the outer membrane of the nuclear membrane. They occur in almost every type of eukaryotic cell except red blood cells and sperm cells.

ANSWER

Then how frog and such animals having absence of ear pinna are able to provide direction to the sound waves coming from ext.enviornment to internal ear

Posted by Kiran Kumawat 7 years, 2 months ago

CBSE > Class 12 > Biology

6 answers

Vinayak Sharma 7 years, 1 month ago

They have special chemicals in their tongue by which they recognise their prey as well as direction

Hy Shona 7 years, 2 months ago

I think i am right

Hy Shona 7 years, 2 months ago

And the answer is that snake found direction with the help of vibration cause to particles due to sound

Hy Shona 7 years, 2 months ago

It's ok kiran i think sahil was answering the above question and is typed here it has also done by me by mistake.

Kiran Kumawat 7 years, 2 months ago

Read the question then answer

Sahil Swami 7 years, 2 months ago

It means that nitrogen atom is sharing its electron oxygen atom . Nitrogen shares it's four pair of electrons with Oxygen , therefore nitrogen covalency is four .

ANSWER

Animal in which ear pinna is absent

Posted by Kiran Kumawat 7 years, 2 months ago

CBSE > Class 12 > Biology

1 answers

Hy Shona 7 years, 2 months ago

Frog

ANSWER

Full form of YAC

Posted by Abhishek Kumar 7 years, 2 months ago

CBSE > Class 12 > Biology

1 answers

Arihant Singh 7 years, 2 months ago

Yeast artificial chromosome

ANSWER

Two heterozygous parents are crossed. If the two loci are linked what would be the distribution of phenotypic features in F1 generation for a dihybrid cross?

Posted by Amir Suhail 7 years, 2 months ago

CBSE > Class 12 > Biology

0 answers

ANSWER

How is a mature functional insulin hormones different from its pro-hormone form?

Posted by Amir Suhail 7 years, 2 months ago

CBSE > Class 12 > Biology

1 answers

Hy Shona 7 years, 2 months ago

Prohormone have a c chain which is absent in mature insulin .

ANSWER

Why amoeba is immortal

Posted by Saurav Nagda 7 years, 2 months ago

CBSE > Class 12 > Biology

1 answers

Yogita Ingle 7 years, 2 months ago

Amoeba is considered immortal because it does not undergo natural death.
In single-celled organisms like Amoeba and bacteria the parental body itself divides into two parts and becomes daughter cells. Each of these divided cells rapidly grows into adult organisms. Therefore, the parent cannot be said to have died, it continues living as daughter cells.

ANSWER

Function of germ pore

Posted by Zeba Ansari 7 years, 2 months ago

CBSE > Class 12 > Biology

2 answers

Anuradha Sharma 7 years, 2 months ago

From which pollen tube germinate.

Chembio Sucker 7 years, 2 months ago

germ pore helps in the indentification of some pollen grains

ANSWER

What is the meaning of bioreactor

Posted by Shubham Bhowmick 7 years, 2 months ago

CBSE > Class 12 > Biology

3 answers

Rana Pratap 7 years, 2 months ago

Bioreactor are the large vessel of vol. 100-1000 litres in which raw material are biologically converted into products and enzymes,other services

Rana Pratap 7 years, 2 months ago

Bioreactors are the large vessel of 11

Muskan Singh 7 years, 2 months ago

Bioreactor is just a fermentor which is used for the cell culturing mainly microbial cell growth

ANSWER

differentiate between growth and development

Posted by Sumit Kumar 7 years, 2 months ago

CBSE > Class 12 > Biology

1 answers

Rajat Shukla 7 years, 2 months ago

Growth means length and development means vikas

ANSWER

How the variations are useful in genetic engineering.

Posted by Divyanshi Mishra 7 years, 2 months ago

CBSE > Class 12 > Biology

0 answers

ANSWER

Can one complete the whole syllabus of biology of class 12 within 2 months?

Posted by Kanwarjit Singh 7 years, 2 months ago

CBSE > Class 12 > Biology

6 answers

Hy Shona 7 years, 2 months ago

But u only have to do that u have to study only bio leaving all other subjects because it is not too hard subject because mostly of thing we experience ,already know and observe.we just get our answers that why that happens.it is just easy and the most important is to remember them .

Kanwarjit Singh 7 years, 2 months ago

But how?

Hy Shona 7 years, 2 months ago

Yes

Mohit Sepat 7 years, 2 months ago

Yes

Rana Pratap 7 years, 2 months ago

Yes

Chembio Sucker 7 years, 2 months ago

its me

ANSWER

Chromosome no.of a plant sps is 16 . What is the no.of microspore mother cell and endosperm cells

Posted by Anantha Krishnan 7 years, 2 months ago

CBSE > Class 12 > Biology

2 answers

Mohit Sepat 7 years, 2 months ago

Endosperm cells are 24

Satish Kumar Sharma 7 years, 2 months ago

4

ANSWER

Write about scp, BOD, spleen, central dogma?

Posted by Vishal Thakur 7 years, 2 months ago

CBSE > Class 12 > Biology

0 answers

ANSWER

What is gubernaculum ?

Posted by Samriddhi Udaywal 7 years, 2 months ago

CBSE > Class 12 > Biology

0 answers

ANSWER

if all the female culex mosquitoes in the world are hypothetically killed will there be filariasis in the world anymore

Posted by Shaista Parveen 7 years, 2 months ago

CBSE > Class 12 > Biology

2 answers

Hy Shona 7 years, 2 months ago

Yes because it will find other way

Samriddhi Udaywal 7 years, 2 months ago

May be because filariasis is caused only due to the bite of culex(female) mosquito

ANSWER

what do you infer from the resemblance between flying squirrel and flying phalanger with reference to their evolution

Posted by Saloni S 7 years, 2 months ago

CBSE > Class 12 > Biology

0 answers

ANSWER

Do eukaryotic cells have restriction endonucleases?

Posted by Kartik Karadm 7 years, 2 months ago

CBSE > Class 12 > Biology

0 answers

ANSWER

Steps involved in recombinant DNA technology

Posted by Lakshmi S 7 years, 2 months ago

CBSE > Class 12 > Biology

0 answers

ANSWER

State two postulate of oparin and Haldane with reference to origin of life.

Posted by Arti Vishwakarma 7 years, 2 months ago

CBSE > Class 12 > Biology

0 answers

ANSWER

How can able to rember 16 lessons in biology

Posted by Sai Ganesh Patnaik 7 years, 2 months ago

CBSE > Class 12 > Biology

2 answers

Virender Singh 7 years, 2 months ago

Sleeping

Aniket Upadhyay 7 years, 2 months ago

Read the NCERT with full concentration and understand the concepts

ANSWER

Classification of fern

Posted by Aayushi Sharma 7 years, 2 months ago

CBSE > Class 12 > Biology

0 answers

ANSWER

l m back ................hi! akshat dekh kitni aachi fake id banayi maine kitne bade bade pravachan diye chal bata kaisa laga

Posted by Kiara Khurrana 7 years, 2 months ago

CBSE > Class 12 > Biology

0 answers

ANSWER

What is artificial insemination

Posted by Abhinaw Tripathi 7 years, 2 months ago

CBSE > Class 12 > Biology

1 answers

Yogita Ingle 7 years, 2 months ago

Artificial insemination is a method of improvement in animals by using controlled breeding methods. During this process, the semen collected from the selected superior quality male parent is injected into the reproductive tract of selected female parent by the breeder.

ANSWER

What is the role of AUG and UGA during protien synthesis

Posted by Raunak Pandey 7 years, 2 months ago

CBSE > Class 12 > Biology

1 answers

Yogita Ingle 7 years, 2 months ago

AUG is the start codon that initiates the protein synthesis. It code for amonia acid emthionine.
UGA is the stop codon that signals for the termination of protein synthesis.

ANSWER

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