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Recent questions tagged class 12
Questions
What is the unit of productivity in terms of energy and weight respectively?
cbsc
class 12
biology
organisms and population
sec-a
asked
Apr 19, 2019
by
priyanka.clay6
1
answer
State Allen's rule.
cbsc
class 12
biology
organisms and population
sec-a
asked
Apr 19, 2019
by
priyanka.clay6
1
answer
"Abingdon tortoise in Galapagos islands became extinct within a decade after goats were introduced in that island". Can you cite the possible reason for the same?
cbsc
class 12
biology
organisms and population
sec-a
asked
Apr 19, 2019
by
priyanka.clay6
1
answer
Two closely related species competing for the same resources cannot co-exist indefinitely. State the principle which supports this phenomenon.
cbsc
class 12
biology
organisms and population
sec-a
asked
Apr 19, 2019
by
priyanka.clay6
1
answer
Cattle or goats never graze on weeds of calotropis. Give reasons.
cbsc
class 12
biology
organisms and population
sec-a
asked
Apr 19, 2019
by
priyanka.clay6
1
answer
People living in higher altitudes have higher RBC count. Give reasons
cbsc
class 12
biology
organisms and population
sec-a
asked
Apr 19, 2019
by
priyanka.clay6
1
answer
An orchid plant is growing on a mango tree. How do you describe the interaction between the orchid and the mango tree?
cbsc
class 12
biology
organisms and population
sec-a
asked
Apr 19, 2019
by
priyanka.clay6
1
answer
Most living organisms cannot survive at temperatures above $45^{\circ}c$. How are some microbes able to live in habitats with temperature beyond $100^{\circ}c$?
cbsc
class 12
biology
organisms and population
sec-a
asked
Apr 19, 2019
by
priyanka.clay6
1
answer
How did Meselson and Stahl experimentally prove that DNA replication is semi conservative? Explain
cbsc
class 12
biology
molecular basis of inheritance
sec-d
asked
Apr 19, 2019
by
priyanka.clay6
1
answer
(a) Identify the structure shown above.
cbsc
class 12
biology
molecular basis of inheritance
sec-d
asked
Apr 19, 2019
by
priyanka.clay6
1
answer
(a) Differentiate between repetitive and satellite DNA. <br> (b) How can satellite DNA be isolated? Explain. <br> (c) List two forensic applications of this technology.
cbsc
class 12
biology
molecular basis of inheritance
sec-d
asked
Apr 19, 2019
by
priyanka.clay6
1
answer
(a) Describe the process of synthesis of fully functional mRNA in a eukaryotic cell. <br> (b) How is this process of mRNA synthesis different from that in prokaryotes?
cbsc
class 12
biology
molecular basis of inheritance
sec-d
asked
Apr 19, 2019
by
priyanka.clay6
1
answer
Answer the following questions based on Meselson and Stahl's experiment : <br> a. Write the name of the chemical substance used as a source of nitrogen in the experiment by them. <br> b. Why did the scientists synthesize the light and the heavy DNA molecules in the organism in the experiment? <br> c. How did the scientists make it possible to distinguish the heavy DNA molecule from the light DNA molecule? Explain. <br> d. Write the conclusion the scientists arrived at, after completing the experiment.
cbsc
class 12
biology
molecular basis of inheritance
sec-d
asked
Apr 19, 2019
by
priyanka.clay6
1
answer
Explain Mac Leod, McCarty and Avery`s work that followed Griffith`s experiment. State the conclusion they arrived at.
cbsc
class 12
biology
molecular basis of inheritance
sec-d
asked
Apr 19, 2019
by
priyanka.clay6
1
answer
Describe Frederick Griffith`s experiment on Streptococcus pneumoniae. Discuss the conclusion he arrived at.
cbsc
class 12
biology
molecular basis of inheritance
sec-d
asked
Apr 19, 2019
by
priyanka.clay6
1
answer
(a)Write the specific features of the genetic code AUG. <br> (b) Codes can be universal and degenerate. Write about them giving one example of each. <br> (c) What is aminoacylation of the tRNA.
cbsc
class 12
biology
molecular basis of inheritance
sec-d
asked
Apr 19, 2019
by
priyanka.clay6
1
answer
(a)Write the conclusion drawn by Griffith at the end of his experiment with Streptococcus pneumoniae. <br> (b) How did Avery, C. MacLeod and M.McCarty prove that DNA was the genetic material? Explain.
cbsc
class 12
biology
molecular basis of inheritance
sec-d
asked
Apr 19, 2019
by
priyanka.clay6
1
answer
Explain the process of protein synthesis from processed m-RNA.
cbsc
class 12
biology
molecular basis of inheritance
sec-d
asked
Apr 19, 2019
by
priyanka.clay6
1
answer
cbsc
class 12
biology
molecular basis of inheritance
sec-c
asked
Apr 19, 2019
by
priyanka.clay6
1
answer
If a nucleosome contain 200 bps. How many nucleosome are there in a mamalian cell? What changes occur to beads of string of D.N.A during metaphase?
cbsc
class 12
biology
molecular basis of inheritance
sec-c
asked
Apr 19, 2019
by
priyanka.clay6
1
answer
Two persons filed a case against a lady claiming to be the father of her only daughter. How to identify the real biological father?
cbsc
class 12
biology
molecular basis of inheritance
sec-c
asked
Apr 19, 2019
by
priyanka.clay6
1
answer
Write short notes on RNA polymerases of eukaryotic cells?
cbsc
class 12
biology
molecular basis of inheritance
sec-c
asked
Apr 19, 2019
by
priyanka.clay6
1
answer
DNA is the genetic material in most of the organisms, while RNA is the genetic material in a few viruses. What are the four general/common functions performed by RNA in other organisms?
cbsc
class 12
biology
molecular basis of inheritance
sec-c
asked
Apr 19, 2019
by
priyanka.clay6
1
answer
(a) What are the transcriptional products of RNA polymerase III ? <br> (b) Differentiate between 'capping' and 'tailing' <br> (c) Expand hnRNA
cbsc
class 12
biology
molecular basis of inheritance
sec-c
asked
Apr 19, 2019
by
priyanka.clay6
1
answer
It is established that RNA is the first genetic material. Explain giving three reasons?
cbsc
class 12
biology
molecular basis of inheritance
sec-c
asked
Apr 19, 2019
by
priyanka.clay6
1
answer
Explain the role of $^{35}S$ and $^{32}P$ in the experiments conducted by Hershey and Chase?
cbsc
class 12
biology
molecular basis of inheritance
sec-c
asked
Apr 19, 2019
by
priyanka.clay6
1
answer
Explain the two major approaches involved in the sequencing of genomes.
cbsc
class 12
biology
molecular basis of inheritance
sec-c
asked
Apr 19, 2019
by
priyanka.clay6
1
answer
How is Lac operon ―switched on‖ in an E.coli cell ?
cbsc
class 12
biology
molecular basis of inheritance
sec-c
asked
Apr 19, 2019
by
priyanka.clay6
1
answer
Describe the discontinuous synthesis of DNA.
cbsc
class 12
biology
molecular basis of inheritance
sec-c
asked
Apr 19, 2019
by
priyanka.clay6
1
answer
What does central dogma state in molecular biology? How does it differ in some viruses?
cbsc
class 12
biology
molecular basis of inheritance
sec-b
asked
Apr 19, 2019
by
priyanka.clay6
1
answer
Differentiate between VNTR and a probe.
cbsc
class 12
biology
molecular basis of inheritance
sec-b
asked
Apr 19, 2019
by
priyanka.clay6
1
answer
How do histones acquire positive charge?
cbsc
class 12
biology
molecular basis of inheritance
sec-b
asked
Apr 19, 2019
by
priyanka.clay6
1
answer
Differentiate between cistron and exon.
cbsc
class 12
biology
molecular basis of inheritance
sec-b
asked
Apr 19, 2019
by
priyanka.clay6
1
answer
What is satellite DNA in a genome? Explain their role in DNA fingerprinting.
cbsc
class 12
biology
molecular basis of inheritance
sec-b
asked
Apr 19, 2019
by
priyanka.clay6
1
answer
What is the genetic basis for proof that codon is a triplet and is read in a contiguous manner without punctuations?
cbsc
class 12
biology
molecular basis of inheritance
sec-b
asked
Apr 18, 2019
by
priyanka.clay6
1
answer
Why is DNA a better genetic material when compared to RNA?
cbsc
class 12
biology
molecular basis of inheritance
sec-b
asked
Apr 18, 2019
by
priyanka.clay6
1
answer
What is the function of non-histone chromosomal proteins?
cbsc
class 12
biology
molecular basis of inheritance
sec-b
asked
Apr 18, 2019
by
priyanka.clay6
1
answer
Differentiate between euchromatin and heterochromatin.
cbsc
class 12
biology
molecular basis of inheritance
sec-b
asked
Apr 18, 2019
by
priyanka.clay6
1
answer
A point mutation leads to adverse change in the function of hemoglobin (B globin chain). Identify the disease that may occur due to this mutation. Mention the change of amino acids in the polypeptide due to this mutation.
cbsc
class 12
biology
molecular basis of inheritance
sec-b
asked
Apr 18, 2019
by
priyanka.clay6
1
answer
Three enzymes required for metabolism of lactose, what would happen to the Machinery of the operon if mutation occur in z-gene.
cbsc
class 12
biology
molecular basis of inheritance
sec-b
asked
Apr 18, 2019
by
priyanka.clay6
1
answer
What are the untranslated regions (UTRs) ?
cbsc
class 12
biology
molecular basis of inheritance
sec-b
asked
Apr 18, 2019
by
priyanka.clay6
1
answer
What is frame shift mutation ? Name the type of mutation that does not affect protein synthesis.
cbsc
class 12
biology
molecular basis of inheritance
sec-b
asked
Apr 18, 2019
by
priyanka.clay6
1
answer
What are the functions of DNA polymerase ?
cbsc
class 12
biology
molecular basis of inheritance
sec-b
asked
Apr 18, 2019
by
priyanka.clay6
1
answer
What is meant by semi conservative nature of DNA replication ?
cbsc
class 12
biology
molecular basis of inheritance
sec-b
asked
Apr 18, 2019
by
priyanka.clay6
1
answer
Complete the labels X,Y and K :
cbsc
class 12
biology
molecular basis of inheritance
sec-a
asked
Apr 18, 2019
by
priyanka.clay6
1
answer
The diagram depicts a stage in transcription. Mention the stage and indicate A .
cbsc
class 12
biology
molecular basis of inheritance
sec-a
asked
Apr 18, 2019
by
priyanka.clay6
1
answer
Write the anticodon of the given t-RNA
cbsc
class 12
biology
molecular basis of inheritance
sec-a
asked
Apr 18, 2019
by
priyanka.clay6
1
answer
Write the name of the bond ?
cbsc
class 12
biology
molecular basis of inheritance
sec-a
asked
Apr 18, 2019
by
priyanka.clay6
1
answer
Complete the following, label A,B and C and name the process(Dogma).
cbsc
class 12
biology
molecular basis of inheritance
sec-a
asked
Apr 18, 2019
by
priyanka.clay6
1
answer
Amino acid Arginine if coded by CGU; how many codons can code for this amino acid?
cbsc
class 12
biology
molecular basis of inheritance
sec-a
asked
Apr 17, 2019
by
priyanka.clay6
1
answer
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