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

Experiment on transforming principal to find that which of the ... Biochemicals (like dnaes ,rnaes or proteases).. is responsible for changing the r strain bacteria into s- strain

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Bring out the difference between De vries mutations and Darwinian variations?

Posted by Aman Alam 6 years, 9 months ago

CBSE > Class 12 > Biology

2 answers

Yogita Ingle 6 years, 9 months ago

The mutation theory differs from Darwin's theory in the nature of the variations. Continuous variations or fluctuations are the raw materials for the formation of new species in Darwin's theory of natural selection, but in De Vries theory, discontinuous variations or mutations are the raw materials. Darwins theory stated that evolution is a gradual process while De Vries stated that the process is sudden.

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Baahubali ??????? 6 years, 9 months ago

Hugo deVries Mutation:- 1.Directionless 2.Sudden 3.Random Darwin's Variations:- 1.Directional 2.Gradual/slow 3.Continous variation

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How could i get the passing marks only??

Posted by Anshika Babbar 6 years, 9 months ago

CBSE > Class 12 > Biology

1 answers

Niranjan Rathore 6 years, 9 months ago

Just do Chapter 2,3,5,6,8,11,12

3Thank You

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agar ncert ki back exercises pdh lo toh kya kafi hai board ke liye kyunki sirf 2 hi din hai

Posted by Kirti Vohra 6 years, 9 months ago

CBSE > Class 12 > Biology

2 answers

A Jaiswal 6 years, 9 months ago

No it's not...... You should revise all chapters with ncert...... Thodi mehnat Krni pdegi...... ☺

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Saima Jain 6 years, 9 months ago

Ya it's enough to score 45 marks

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Arrange in increasing order of their contribution towards global warming- no2, c2h4, co2,

Posted by Vishal Dutta 6 years, 9 months ago

CBSE > Class 12 > Biology

2 answers

Baahubali ??????? 6 years, 9 months ago

Lowest C2H4 then NO2 and the highest CO2

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Baahubali ??????? 6 years, 9 months ago

C2H4<NO2<CO2

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Extend PBR?

Posted by A Jaiswal 6 years, 9 months ago

CBSE > Class 12 > Biology

1 answers

Baahubali ??????? 6 years, 9 months ago

pBR stands for plasmid Boilvar Rodriguez

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Define seed

Posted by Abdul Saifi 6 years, 9 months ago

CBSE > Class 12 > Biology

2 answers

A Jaiswal 6 years, 9 months ago

Kya yrrr time pass kr rha h kya....... ☺

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Harshita Panwar 6 years, 9 months ago

It is a fertilised ovule which is the final product of sexual reproduction

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Why do we say there is no natural death in single _celled organism

Posted by Palli Singh 6 years, 9 months ago

CBSE > Class 12 > Biology

2 answers

Pratiksha Tiwari 6 years, 9 months ago

Single cell organism keeps on dividing into two by asexually soat the end of their life cycle is only possible due to high temperature and ph.

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Nidhi Chauhan 6 years, 9 months ago

As single cell organism completely divide into its daughter cell no matter remain behind that's why there is no natural death ... these are also called as immortal

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A true breeding pea plant, homozygous for inflated green pods is crossed with another pea plant with constricted yellow pods (ffgg). What would be the phenotype and genotype of F1 and F2 generations? Give the phenotype ratio of F2 generation. (b) State the generalisation proposed by Mendel on the basis of the above mentioned cross

Posted by Vishwa Patel 6 years, 9 months ago

CBSE > Class 12 > Biology

0 answers

ANSWER

What is founder effect?

Posted by Minakshi Mathur 6 years, 9 months ago

CBSE > Class 12 > Biology

1 answers

Baahubali ??????? 6 years, 9 months ago

When a section of population get isolated or migrated or drifted from original population, then this section becomes genetically different from the original population due to change in allelic frequency because gene pool of this section may contain some alleles in Avery low frequency or may lack a few alleles. Sometimes change in allelic frequency is so different in the new sample of population that they are become a different species. The original drifted population becomes founders and the effect is called founder effect

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Describe the structure of RNA polynucleotide chain having four different types of nucleotides

Posted by Kalas Sahu 6 years, 9 months ago

CBSE > Class 12 > Biology

0 answers

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What is allergy?

Posted by Sandra Suresh 6 years, 9 months ago

CBSE > Class 12 > Biology

2 answers

Simran Rana 6 years, 9 months ago

The exggrated response of immune system towards certain antigen present in the environment...

2Thank You

Mandeep Sandhu 6 years, 9 months ago

It is the hypersensitive state of the skin in response to some allergen.

3Thank You

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Define carrying capacity.

Posted by Sandra Suresh 6 years, 9 months ago

CBSE > Class 12 > Biology

1 answers

Simran Rana 6 years, 9 months ago

It is defined as in nature,a given habitat has a enough resources to support a possible number beyond which no further growth is poosible....

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Describe the structure of RNA polynucleotide chain having four different of inheritance exhibited

Posted by Kalas Sahu 6 years, 9 months ago

CBSE > Class 12 > Biology

0 answers

ANSWER

Expand EFB

Posted by Kalas Sahu 6 years, 9 months ago

CBSE > Class 12 > Biology

1 answers

Shivam Jaiswal 6 years, 9 months ago

European fedration of biology

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When does the microspore dissociate from each other and develop into pollen grain

Posted by Sataybir Sataybir 6 years, 9 months ago

CBSE > Class 12 > Biology

1 answers

Harshita Panwar 6 years, 9 months ago

When anther dehydrates microspore seperates

1Thank You

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What is the full form of LSD ?

Posted by Tanu Singh 6 years, 9 months ago

CBSE > Class 12 > Biology

1 answers

Baahubali ??????? 6 years, 9 months ago

Lysergic Acid Diethyl is a dangerous hallucinogen, obtain from fruiting body of fungus(Claviceps purpurea)

1Thank You

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what is the difference between monocious and homothallic ?

Posted by Dhruv Bansal 6 years, 9 months ago

CBSE > Class 12 > Biology

1 answers

Anuj Saini 6 years, 9 months ago

While homothallic word is used for some classes of fungi

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Anyone need help in biology then ask.....☺

Posted by A Jaiswal 6 years, 9 months ago

CBSE > Class 12 > Biology

3 answers

Lily ☺ 6 years, 9 months ago

Sure

0Thank You

A Jaiswal 6 years, 9 months ago

Ohk then ask..... ☺

0Thank You

Abhimanyu Markam 6 years, 9 months ago

I need help

2Thank You

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What is sheli

Posted by Rahul Gupta 6 years, 9 months ago

CBSE > Class 12 > Biology

1 answers

Shivam Jaiswal 6 years, 9 months ago

Bhai vo saheli hai Contraceptive oral pills

2Thank You

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Difference between transcription and translation

Posted by Deeksha Bhardwaj 6 years, 9 months ago

CBSE > Class 12 > Biology

1 answers

Yogita Ingle 6 years, 9 months ago

Transcription:

1. It is formation of RNA from DNA.

2. The template is antisense strand of DNA.

3. It occurs inside the nucleus in eukaryotes and cytoplasm in prokaryotes.

4. The raw materials are four types of ribo-nucleoside triphosphates — ATP, GTP. CTP and UTP.

5. It forms three types of RNAs — rRNA, tRNA and mRNA.

6. Transcription requires RNA polymerases and some transcription factors.

7. Polymerase moves over the template.

8. An adapter molecule is not required,

9. Product often requires splicing.

Translation:

1. It is synthesis of polypeptide over ribosome.

2. The template is mRNA.

3. It occurs in cytoplasm.

4. The raw materials are 20 types of amino acids.

5. All the three types of RNAs take part in translation.

6. Translation requires initiation, elongation and translocase factors.

7. Ribosome moves over mRNA.

8. Adapter (= adaptor) molecules bring amino acids over the template.

9. Splicing is absent.

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Mention the role of ribosomes in peptide bond formation. How does ATP facilitates it?

Posted by Lokesh Ramadas 6 years, 9 months ago

CBSE > Class 12 > Biology

0 answers

ANSWER

How to revice full bio in two days

Posted by Saksham Sharma 6 years, 9 months ago

CBSE > Class 12 > Biology

1 answers

Meet Chauhan 6 years, 9 months ago

Read all the chapters carefully once. Do read last years question papers. But for better understanding,you should had read all the chapters before once.

2Thank You

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Peach is bisexual or unisexual

Posted by Dilpreet Sandhu 6 years, 9 months ago

CBSE > Class 12 > Biology

1 answers

Baahubali ??????? 6 years, 9 months ago

It is a bisexual or hermaphrodite plant

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Differentiate between homology and analogy

Posted by Adnan Ahmad Khan 6 years, 9 months ago

CBSE > Class 12 > Biology

2 answers

Baahubali ??????? 6 years, 9 months ago

If origin and function of any two things is same then it is said to be homologous and if function is same but origin is different then it is said to be analogous

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Vishal Dutta 6 years, 9 months ago

Homology-Divergent. Give eg. Analogy-Convergent. Give eg.

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Diversity of Viruses,bacteria and fungi

Posted by Abhi Tiwari 6 years, 9 months ago

CBSE > Class 12 > Biology

0 answers

ANSWER

Define vermicompost

Posted by Ritu Rishu 6 years, 9 months ago

CBSE > Class 12 > Biology

1 answers

Baahubali ??????? 6 years, 9 months ago

Vermicompost is a product of the composting process using various species of worms and usually red wrigglers, white worms and other earthworms to create a mixture of decomposing vegetables or food wastes and bedding material. Vermicast is the end product of breakdown of organic matter by earthworms

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