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

A deoxyribonucleotide is rhe monomer , or single unit of DNA . When deoxyribonucleotides polymerize to form DNA, the phosphate group from one nucleotide will bond to the 3' carbon on another nucleotide forming a phosphodiester bond via dehydration stnthesis.

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2018,2016,2015,2013 biology delhi compartment papers with answer?????

Posted by Geetika Dayma 7 years ago

CBSE > Class 12 > Biology

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What is menstrual cycle

Posted by Rohit Singh 7 years ago

CBSE > Class 12 > Biology

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Yogita Ingle 7 years ago

In a life cycle, a woman’s body is vulnerable to a variety of changes. The cycle of these changes in women every month, positively for pregnancy is called menstrual cycle. When an ovum is unfertilized, the uterus lining sheds and leads to hemorrhage, called menstruation. In a girl, menstruation starts from the age of 10 to 15 when she attains puberty and this beginning is known as menarche. The ending of menstruation is known as menopause which takes place at the age range of 50.

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What is the meaning of immortal

Posted by Aryan Sharma 7 years ago

CBSE > Class 12 > Biology

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Aditya Vyas 7 years ago

That do not die

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Azmat Ali 7 years ago

Immortal means the one who can't die(amar) and live for infinite time .

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Can uh plz give me notes of biotechnology

Posted by Nikita Singh 7 years ago

CBSE > Class 12 > Biology

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Saumya Agrawal 7 years ago

You can refer to rajkumar biology site on google. It will help you a lot

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Describe the mechanism of action of saheli pills

Posted by Biswa Bandita 7 years ago

CBSE > Class 12 > Biology

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Yogita Ingle 7 years ago

Saheli is a contraceptive pills, developed by Indian scientists.It prevents unwanted pregnancy.

Dosage: Once in 21 days

Action: The pill has a very high level of Follicle stimulating hormone(FSH) and Luetinising hormone(LH). Which prevents the ovulation and hence thereby preventing fertilisation which causes pregnancy.

Side effects: may cause hormonal imbalance,or irritation.

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If the father has blood group ab and mother has b .show the possible blood group in ab.

Posted by Anjali Yadav 7 years ago

CBSE > Class 12 > Biology

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Samir Mughal??????️? 7 years ago

50 percentage

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Aakash Kumar 7 years ago

25 percentage

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What is a vntr probe

Posted by Basil Gijo 7 years ago

CBSE > Class 12 > Biology

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Aditya Vyas 7 years ago

It is a type of technique through which an organism 's dna fingerprint can be detected or verified usually used in murder cases its full form is variable no. Tandem repeats it works on principle which require RFLP which is specific for an organism it doesnot matches to other people dna fingerprint except monozygotic twins .

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Sanjana Madhu 7 years ago

Variable number tandem repeats in DNA fingerprinting

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Lab manual ?

Posted by Ashutosh Singh Thakur 7 years ago

CBSE > Class 12 > Biology

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Write the type of *** determination mechanism in following cross show female XX with male xy

Posted by Kajal Nagar 7 years ago

CBSE > Class 12 > Biology

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Cry DNA topic has in which chapter

Posted by Shobha??? Kumari 7 years ago

CBSE > Class 12 > Biology

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Harshit Kumar 7 years ago

Chapter 6

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Gallbladder ka Hindi Kya Hota Hai

Posted by Pramod Yadav 7 years ago

CBSE > Class 12 > Biology

1 answers

D K 7 years ago

पित

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Define pathogenesis

Posted by Samrat Kotarki 7 years ago

CBSE > Class 12 > Biology

2 answers

Tarun Gulia 7 years ago

Not ovum its embroy

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Yash P. 7 years ago

Development of ovum without fertilisation in animals eg turkey, honeybee

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How is the allergic response produced in the body?

Posted by Sunder Singh 7 years ago

CBSE > Class 12 > Biology

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Harshit Kumar 7 years ago

Because of the insulin that we take from cattle or slaughtered pig cause allergic reactions in the body because of several harmone discarded the insulin which are not supported by our body

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Difference between parthenography and parthenogenesis

Posted by Tanzila Shaikh 7 years ago

CBSE > Class 12 > Biology

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State the contribution of macleod , mccarty and avery

Posted by Praveen Mundefi 7 years ago

CBSE > Class 12 > Biology

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Yogita Ingle 7 years ago

They (worked on the bio-chemical nature of transforming prin ciple in Griffith's experiment) purified proteins DNA and RNA from heat killed S cells , they discovered protein digesting enzyme(protease)RNA digesting enzyme (RNase) did not affect tra nsformation , Digestion with DNase inhibited transformation , concluded DNA is the here dity material

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Diagram of male reproductive system

Posted by Suraj Meena 7 years ago

CBSE > Class 12 > Biology

1 answers

Daivik Gautam 5 years, 8 months ago

Ye cheez tu net par nhi dekh sakta Ullu mat bana Itna hi time hai to pad le

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What are cistrons in RNA or DNA

Posted by Aditya Bhatt 7 years ago

CBSE > Class 12 > Biology

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Gaurav Seth 7 years ago

Cistron : A segment of DNA coding for a polypeptide; the structural gene in a transcription unit could be said as monocistronic (mostly in eukaryotes) or polycistronic (mostly in bacteria or prokaryotes).

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What is pioneer species ?

Posted by Mukesh Verma 7 years ago

CBSE > Class 12 > Biology

2 answers

Harshit Kumar 7 years ago

The Importance of Pioneer Species. Because pioneer species are the first to return after a disturbance, they are the first stage of succession, and their presence increases the diversity in a region. They are usually a hardy plant, algae or moss that can withstand a hostile environment.

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Mukesh Verma 7 years ago

Pioneer species are hardy species which are first to colonize previously biodiverse steady- state ecosystems

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Ecological succession is faster in a fire devastated forest than on a bare rock justify the statement

Posted by Shivani Uniyal 7 years ago

CBSE > Class 12 > Biology

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Harshit Kumar 7 years ago

Because the dead living organism or dead plant undergoes in soil where enrichement of soil take place.which leads to the faster growth of ecological succession take place.where else on the other hand when we talk about ecological succession are slower on bare rock because after many thousands year dust,sand,clay formation took place then the formation of soil take place this is the very long process.To formation of ecological successio take place

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Why is human genome project considered as mega project ?

Posted by Arti Vishwakarma 7 years ago

CBSE > Class 12 > Biology

3 answers

Harshit Kumar 7 years ago

Welcome i had pleasure to post my answere in simpler sentences

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Tarun Gulia 7 years ago

because it is a mega projectit has 3 × 10 raised to the power9 base pair and its overall cost is $ 9 billion 2. if u have to store the information of a human genome a page has 1000 lettwrs and each book has 1000 pages then 3300 books are requried to store the information of a single human genome thats why it is a mega peoject

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Harshit Kumar 7 years ago

because it had a specific goal to sequence every base pair present in the human genome. It took around 13 years for its completion and got accomplished in year 2003.

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Which character where study by Mendel when experimenting on garden pea .

Posted by Arti Vishwakarma 7 years ago

CBSE > Class 12 > Biology

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Saraswati Sharma 7 years ago

Pea shape (round or wrinkled) Pea color (green or yellow) Pod shape (constricted or inflated) Pod color (green or yellow) Flower color (purple or white) Plant size (tall or dwarf) Position of flowers (axial or terminal)

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What is an Anupleiody in chapter inheritance of genetic

Posted by Hitesh Rao 7 years ago

CBSE > Class 12 > Biology

4 answers

Tarun Gulia 7 years ago

It is just only gain or loss of 1 chromosome .eg turners syndrome

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Saraswati Sharma 7 years ago

When the Chromatids fail to segregate during cell division, resulting in gain or loss of a chromosome. This is called aneuploidy.

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Arti Vishwakarma 7 years ago

Faiture of segregation of chromatids during cell division in loss or gain of chromosome called Aneuploidy

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Mr. Singh 7 years ago

Anupleiody is the presence of an abnormal number of chromosomes in a cell, for example a human cell having 45 or 47 chromosomes instead of the usual 46. It does not include a difference of one or more complete sets of chromosomes.

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What is ecology?

Posted by Saurav Kumar 7 years ago

CBSE > Class 12 > Biology

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Yogita Ingle 7 years ago

An ecosystem can be defined as a functional unit of nature, where living organisms interact among themselves and also with the surrounding physical environment.

An ecosystem is divided into two basic categories