DNA প্রতিলিপিত হয় কোন পদ্ধতিতে?

Consider the following statements regarding DNA replication and choose the correct answer:
1. The very first requirement of DNA synthesis is the presence of a template or plan along which the new strand is to be constructed
2. The second requirement is of a DNA-dependent-DNA polymerase or simply DNA polymerase enzyme
3. A DNA Pol cannot join two free nucleotides; one of them must be anchored by hydrogen bonds to a DNA strand
4. Replication takes place bidirectionally

ক

1, 2, 3 and 4 are true

খ

Only 2 and 4 are true

গ

Oniy 2, 3 and 4 are true

ঘ

Only 1 and 2 are true

DNA অণুর অনুলিপনে ল্যাগিং সূত্রের প্রতিলিপিত খন্ডকে কি বলা হয় ?

ক

হেলিক্স

খ

রেপ্লিকেশন

গ

লুপ অংশ

ঘ

ওকাজাকি অংশ

Though the right border (RB) and left border (LB) of T-DNA are identical, the DNA transfer is specific for the DNA left of the RB (the T-DNA), rather than for the DNA left of the LB because

ক

The sequence context at the RB defines the direction of transfer

খ

The sequence context at the LB defines the direction of transfer

গ

The nuclear location sequence (NLS) of VirD2 protein drives the excised T-strand

ঘ

The endonuclease activity of VirD2 protein allows nicking at RB

Which of the following statements about DNA is/are correct?
1. DNA is the hereditary material of all living organisms.
2. All segments of DNA code for synthesis of proteins.
3. Nuclear DNA is double helical with two nucleotide chains which run anti-parallel.
4. DNA is also found in mitochondria.
Select the correct answer:

ক

1, 2 and 3

খ

3 and 4

গ

1, 3 and 4

ঘ

Only 4

Steps of Recombinant DNA technology are given below.
1. Identification and isolation of the genetic material.
2. Fragmentation of DNA.
3. Obtaining the foreign gene product.
4. Downstream processing.
5. Ligation of DNA fragmentation into the vector.
6. Isolation of desired DNA fragments.
7. Amplification of gene of interest.
8. Transfer of Recombinant DNA into the host cell/organism.
The correct sequence of steps is

ক

3, 1, 2, 4, 6, 5, 7, 8

খ

1, 4, 3, 2, 5, 7, 6, 8

গ

1, 2, 6, 7, 5, 8, 3, 4

ঘ

8, 6, 7, 5, 1 , 4, 2, 3

Consider the following statements regarding the DNA-mediated gene transfer and choose the correct answer:
1. DNA fragments carrying the gene to be transferred are mixed with a carrier DNA
2. They are then precipitated out with a calcium phosphate buffer
3. The precipitate is used to transform target cells
4. The Ca-precipitated DNA enters the cell by exocytosis

ক

Only 1, 2 and 4 are true

খ

Only 3 and 4 are true

গ

Only 2, 3 and 4 life true

ঘ

Only 1, 2 and 3 are true

Consider the following statements regarding chain elongation during DNA synthesis and choose the correct answer:
1. The separated strands are kept open by DNA binding proteins (DBPs)
2. A DNA chain is initiated on the 3'- OH end of the primer
3. Okazaki fragments are synthesized on one strand; there is continuous DNA synthesis in the other strand
4. Okazaki fragments are joined by endonuclease

ক

1, 2, 3 and 4 are true

খ

Only 2, 3 and 4 are true

গ

Only 1, 2 and 3 are true

ঘ

Only 1, 3 and 4 are true

Consider the following statements regarding satellite DNA and choose the correct answer:
1. Satellite or Repetitive DNA consists of short identical genes which are repeated in tandem several hundred or thousand times
2. Such DNA is found in the region of the chromosome adjacent to the centromere
3. It is easy to separate repetitive DNA by ultracentrifugation

ক

Only 1 and 2 are true

খ

Only 2 and 3 are true

গ

Only 1 and 3 are true

ঘ

1, 2 and 3 are true

ধরা যাক, যদি A+B বলতে বোঝায় A হয় B এর পিতা, A-B বলতে বোঝায়A হয় B এর স্ত্রী, Ax B বলতে বোঝায় A হয় B এর ভাই, A + B বলতে বোঝায় হয় A হয় B এর বোন তাহলে উপরের আকার অনুসারে P - Rx Q এই প্রকাশটি বলতে কী বোঝাবে?

ক

P হয় Q এর বোন

খ

P হয় Q এর পিতা

গ

P হয় Q এর শ্যালিকা

ঘ

P হয় Q এর দেবর

The fragmentation of DNA in the DNA shuffling technique occurs at specific sites in DNA.

ক

True

খ

False