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If thymine is 20 % so as the adenine is also 20% because adenine always pairs with thymine, therefore, the percentage of adenine and thymine is 20+20 = 40%, thus the remaining 60%is of guanine and cytosine ., if cytosine is 30% then the percentage of guanine is also 30% because guanine is always pair with cytosine.

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How are viral diseases cured if viruses are nearly indestructible?

Posted by Rohit Krishna 5 years, 4 months ago

CBSE > Class 12 > Biology

2 answers

Babli Nim 5 years, 4 months ago

Viruses is like a cheater student or chameleon change their colour in similar way virus changes their structure and motify their body DNA like our body dna in this way immune system take them a part of body and fed them or give condn same as our body dna and therefore it replicates with in our dna sequence.

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? ? 5 years, 4 months ago

Viruses mutate very fast that is why scientists still don't have vaccine for aids however certain vaccines can be made which inhibit the reverse transcriptase enzyme of virus preventing it from further replication and bringing its replication rate under control.

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Are azotobacter and azospirillum autotrophic microbes?

Posted by Abdurrahman Firozkhan 5 years, 4 months ago

CBSE > Class 12 > Biology

1 answers

Punam Gajghatem 5 years, 4 months ago

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A person have blood group a+ then how we can write there alleles a+ o- or a+ o- which one is correct

Posted by Abhi Maurya 5 years, 4 months ago

CBSE > Class 12 > Biology

1 answers

? ? 5 years, 4 months ago

+ and - sign are due to presence or absence of rh antigen on rbc surface therefore in order to write alleles then you have to write Ia, Ib and i (Io). And in case of a blood grp alleles can be Ia Ia or Ia Io

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A person have antigen then and antibody b and if a person have blood group a+ then its antibody will b+ or b-

Posted by Abhi Maurya 5 years, 4 months ago

CBSE > Class 12 > Biology

1 answers

? ? 5 years, 4 months ago

If blood grp is a then anti a or b antibodies are present. And since its is a+ that is rh factor is present therefore rh antibodies will be absent or otherwise they will react with the antigen

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New paper class 12

Posted by Jiya Singh 5 years, 4 months ago

CBSE > Class 12 > Biology

1 answers

Raju Singh 5 years, 4 months ago

Draw the ts of young anther showing four microshopen

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What is plasma theropy?

Posted by Ketan Shukla 5 years, 4 months ago

CBSE > Class 12 > Biology

1 answers

Yogita Ingle 5 years, 4 months ago

When pathogens attack our body, our immune system starts working and releases proteins to fight with an infection. These proteins are known as antibodies. If the infected person produces a sufficient amount of protein then he or she will be recovered by antibodies itself.
In plasma therapy, such immunity can be transferred from a healthy person to sick with the help of blood plasma. Here convalescent plasma is the liquid part of the blood from the recovered patients of COVID-19. We can say that in plasma therapy the blood of the recovered person as it is rich in antibodies is used to treat other sick people.

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Why are humming birds not found in the polar regions?

Posted by Shreetam Mohapatra 5 years, 5 months ago

CBSE > Class 12 > Biology

1 answers

? ? 5 years, 4 months ago

Because of their small size...due to small surface area by volume ratio the heat released is very high ....therfore in order to maintain their body temperature they have to spend a lot of metabolic energy which is not feasible for them.

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What is sporogenesis ?

Posted by Navin Kumar 5 years, 5 months ago

CBSE > Class 12 > Biology

2 answers

Pawan Bhullar 5 years, 4 months ago

The word sporo means spores and genesis means formation or production so, the process of the formation of spores is sporogenesis

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Yogita Ingle 5 years, 5 months ago

Sporogenesis is the process of production of spores or reproduction via spores. Reproductive spores are formed in many eukaryotic organisms, such as plants, algae and fungi, during their normal reproductive life cycle. Dormant spores are formed, for example by certain fungi and algae, primarily in response to unfavorable growing conditions. Most eukaryotic spores are haploid and form through cell division. Sporogenesis occurs in reproductive structures termed sporangia. The process involves sporogenous cells undergoing cell division to give rise to spores.

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Mention the primery aim of the assited reptoduction technology programme

Posted by Rituparna Kachari 5 years, 5 months ago

CBSE > Class 12 > Biology

1 answers

Yogita Ingle 5 years, 5 months ago

Assisted Reproductive Technology' (ART) the collection of certain special techniques .The primary aim of the ART programme is to assist infertile couples to have children through certain special techniques (like ZIFT, IUT, GIFT, ICSI, Al, etc.) where corrective treatment is not possible.

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What is trait can we say mixing of two gene or alleles like Tt or tt TT

Posted by Abhi Maurya 5 years, 5 months ago

CBSE > Class 12 > Biology

1 answers

Punam Gajghatem 5 years, 4 months ago

no, trait are characters which we inherits from our parents . ex height

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What is LHsurge

Posted by Rupali Kumari 5 years, 5 months ago

CBSE > Class 12 > Biology

2 answers

Abhi Maurya 5 years, 5 months ago

Maximum secreation of projesterone

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Yogita Ingle 5 years, 5 months ago

Rapid secretion of LH leading to its maximum level during the mid-cycle is called LH surge. It induces rupture of Graafian follicle and thereby the release of ovum (ovulation).

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What do you mean by allele??

Posted by Priya Parjapati 5 years, 5 months ago

CBSE > Class 12 > Biology

1 answers

Yogita Ingle 5 years, 5 months ago

Alleles are the different variations of the same gene and they determine a single characteristic. Alleles decide how features are determined in a person. A pair of alleles produce opposing phenotypes (a description of the actual physical characteristics). The expression of these genes is decided by alleles

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Is haemozoin is present in haemoglobin.

Posted by Ashwani Kumar Singh 5 years, 5 months ago

CBSE > Class 12 > Biology

1 answers

? ? 5 years, 5 months ago

Haemozoin is a toxin which is mainly produced during malaria and is responsible for increasing body temperature. In malaria there is a stage called signet ring in rbc ....the schuffer granules produced in rbc due to plasmodium releases haemozoin.

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Why are cucurbits refered to as monoecious

Posted by Latesh Badgujar 5 years, 5 months ago

CBSE > Class 12 > Biology

1 answers

? ? 5 years, 5 months ago

Cucurbits are monoecious bcoz both male and female flowers are present on same plant.

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Potato tuber arise from_

Posted by Ananya Sharma 5 years, 5 months ago

CBSE > Class 12 > Biology

2 answers

Priya Parjapati 5 years, 5 months ago

Eyes

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Rahul Raj 5 years, 5 months ago

From Eyes From underground stems (stolons)

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Explain the process of dna replication

Posted by Rohit Krishna 5 years, 5 months ago

CBSE > Class 12 > Biology

1 answers

Prezya Kasana Marak 5 years, 5 months ago

DNA replication is the process by which a double Stranded DNA molecule is copied to produce two identical DNA molecules Replication is an essential process because whenever a cell divides the two new daughter cells Must contain the same genetic information ,or DNA as the parents cell

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At which stage pollen are spread in majority of angiosperm

Posted by Shikha Yadav 5 years, 5 months ago

CBSE > Class 12 > Biology

1 answers

? ? 5 years, 5 months ago

At two celled stage

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What is the genotype ratio of dihybrid cross

Posted by Mohit Thakur 5 years, 5 months ago

CBSE > Class 12 > Biology

2 answers

Mohit Thakur 5 years, 4 months ago

Ratio is correctly shows as 1:2:1:2:4:2:1:2:1.

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Prezya Kasana Marak 5 years, 5 months ago

Hence the genotypic ratio of a dihybrid cross will always remain the same i.e1:2:1:2:4:2:1:2:2....when alleles of one gene follow dominant and recessive relationship but the alleles of the second gene are codominant , the f2 phenotypic ratio of dihybrid cross become 3:6:3:1:2:1

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Define allele

Posted by Fact Master 5 years, 5 months ago

CBSE > Class 12 > Biology

2 answers

Prezya Kasana Marak 5 years, 5 months ago

Each of two or more alternative form of a gene that arise by mutation and are found at the same place on chromosome

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Babli Nim 5 years, 5 months ago

Allele occur in pair like in human is a diploid organism. Allele is a pair of genes on Chromosome of an organisms and carry the the information of hierarchy. The allele for hair determine like HH not only single H because over rule that allele occur in pair

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What is self combination

Posted by Kashish Bhadauriya 5 years, 5 months ago

CBSE > Class 12 > Biology