Tag: biology

Questions Related to biology

The nucleus for cloning of dolly was taken from ________

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  1. Finn dorset sheep

  2. Scottish black face ewe

  3. Both A and B

  4. None of these

Show answer
Correct Option: A
Explanation:

The correct answer is oil. finn dorsett is sheep from which the nucleus was taken for cloning of dolly, whereas scottish black face ewe was used for implanticen of egq containing nucleus of finn dorseet sheep.

The first mammal clone dolly was created by

biology reproduction in animals story of dolly, the clone sheep story of dolly, the clone process of cloning

  1. Ian Wilmut

  2. T.H. Morgan

  3. Robert Briggs

  4. Thomas King

Show answer
Correct Option: A
Explanation:

Dolly is the first sheep which was developed by the technique of cloning by Ian Wilmut in the year 1997. The sheep was developed from the diploid body cell. The somatic cell from the mother sheep was taken and the nucleus was injected into the egg cell which was cultured and transferred into the surrogate mother. This method is known as nuclear transfer. The sheep Dolly was identical in the characters with the mother who donated the diploid nucleus from the body cell.  

Thus, the correct answer is option A.

The following are the events in the formation of the first cloned animal the sheep Dolly.
a) Removal of haploid nucleus from the ovum.
b) Implantation of ovum with diploid nucleus into the surrogate mother.
c) Collection of udder cell from the sheep.
d) Injection of diploid nucleus of udder cell into the enucleated ovum.
e) Development of a young clone.The correct sequential order of these events is ________

biology reproduction in animals story of dolly, the clone sheep story of dolly, the clone process of cloning

  1. abcde

  2. cabed

  3. cadbe

  4. edcba

Show answer
Correct Option: A

It is advantageous to use a vector having multiple cloning sites, as it ___________________.

biology reproduction in animals story of dolly, the clone sheep story of dolly, the clone process of cloning

  1. Contains many copies of a cloned gene

  2. Contains many copies of the same restriction enzyme site

  3. Allows flexibility in the choice of restriction enzymes

  4. Allows flexibility in the choice of genes for cloning

Show answer
Correct Option: A

This is not a GMO.

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  1. Bt brinjal

  2. Golden rice

  3. Tracy

  4. Dolly

Show answer
Correct Option: D

Efforts to repeat the cloning of Dolly (the sheep) have been unsuccessful. The scientists who claim to have cloned Dolly have been challenged to produce additional evidence that Dolly is really derived from an adult cell (an originally claimed), rather than a foetal cell which might have contaminated the experiment (as the sceplor suggest). Which of the following could provide evidence that Dolly was created from an adult cell, rather than a foetal cell?

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  1. Dolly's DNA fingerprints

  2. The heterozygosity of random pieces of Dolly's DNA

  3. The melting point of Dolly's DNA

  4. The length of Dolly's telomeres

Show answer
Correct Option: A
Explanation:
Dolly was important because she was the first mammal to be cloned from an adult cell. Her birth proved that specialised cells could be used to create an exact copy of the animal they came from. Dolly's DNA fingerprints could provide evidence that Dolly was created from an adult cell.
So the correct answer is 'Dolly's DNA fingerprint'.

Efforts to repeat the cloning of Dolly the sheep have been unsuccessful. The scientists who claim to have cloned Dolly have been challenged to produce additional evidence that Dolly is really derived from an adult cell (as originally claimed), rather than fetal cells which might have contaminated the experiment (as the skeptics suggest). Which of the following could provide evidence that Dolly was created from an adult cell, rather than a fetal cell

biology reproduction in animals story of dolly, the clone sheep story of dolly, the clone process of cloning

  1. Dolly's DNA finger prints

  2. The heterozygosity of random pieces of Dolly's DNA

  3. The melting point of Dolly's DNA

  4. The length of Dolly's telomeres

  5. Dolly's biological clock

Show answer
Correct Option: D
Explanation:

Telomeres are sections of DNA found at the end of each chromosome. When the chromosomes are replicated during cell division a small portion of the telomeres are lost and thus, they get shorter with the animal's age due to cell division. This led to speculation in the press that Dolly's death was that she could have been born with a genetic age of six years, the same age as the sheep from which she was cloned. One basis for this idea was the finding that Dolly's telomeres were short, which is typically a result of the aging process.

Which of the following statements is incorrect about Dolly, the clone?

biology reproduction in animals story of dolly, the clone sheep story of dolly, the clone process of cloning

  1. Dolly was developed from a cell taken from the mammary gland of Scottish blackface ewe and an unfertilized egg obtained from Finn Dorsett sheep

  2. The egg produced by the fusion was implanted into Scottish blackface ewe

  3. Dolly was identical to Fin Dorsett sheep and was called its done

  4. None of these

Show answer
Correct Option: A
Explanation:

  • Dolly was born on July 5, 1996, at Roslin Institute, the first mammal known to be cloned.
  •  A cell taken from the mammary gland of a 6-year-old Finn Dorset ewe was cloned through a technique known as nuclear transfer. 
  • The reproductive egg cells were removed from another female sheep, a ewe of a Scottish Blackface. 
  • Scottish Blackface egg cells were then fertilized with the genetic material from the Finn Dorset mammary cells and they fertilized cell was transferred to the uterus of the surrogate mother. 
  • On July 5, 1996, Dolly was born from one of the surrogate Blackface ewes which were identical to the Finn Dorset sheep. 

Thus, the correct answer is option A.

Cloning is the production of an exact copy of a cell, any other living part of a complete organism. A sheep named Dolly was the first mammal to be cloned by Ian Wilmut and his colleagues at the Roslin Institute in Edinburgh. Find out the incorrect statements about the cloning of Dolly.

(i) Dolly was born on 5th July 1996.
(ii) Dolly was given birth by the Finn Dorset sheep.
(iii) Dolly was found to be absolutely identical to the Scottish blackface ewe.
(iv) The nucleus of the mammary gland cell from the Finn Dorsett sheep was inserted into the egg of the Scottish blackface ewe whose nucleus had been removed.

biology reproduction in animals story of dolly, the clone sheep story of dolly, the clone process of cloning

  1. (i) only

  2. (i) and (iii) only

  3. (i), (ii) and (iii) only

  4. All of the above

Show answer
Correct Option: D
Explanation:

Dolly was born on July 5, 1996, at Roslin Institute, the first mammal known to be cloned. A cell taken from the mammary gland of a 6-year-old Finn Dorset ewe was cloned through a technique known as nuclear transfer. The reproductive egg cells were removed from another female sheep, a ewe of a Scottish Blackface. Scottish Blackface egg cells were then fertilized with the genetic material from the Finn Dorset mammary cells and they fertilized cell was transferred to the uterus of the surrogate mother. On July 5, 1996, Dolly was born from one of the surrogate Blackface ewes which were identical to the Finn Dorset sheep.

Match column I with column, option from. the codes given below:

Column I Column II
A. Structural and functional -unit of a myofibril (i) H-zone
B. Protein of thin filament (ii) Myosin
C. Protein of thick filament (iii) Sarcomere
D. The central part of thick filament not overlapped by thin filament (iv) Actin
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  1. A-(i), B-(ii), C,(iii), D-(iv)

  2. A-(i), B-(iii), C-(ii), D-(iv)

  3. A-(i), B-(iv), C-(iii), D-(ii)

  4. A-(iii),B-(iv), C-(ii), D-(i)

Show answer
Correct Option: D
Explanation:

 A. Structural and functional -unit of a myofibril - (iii) Sarcomere

B. Protein of thin filament - (iv) Actin

C. Protein of thick filament - (ii) Myosin

D. The central part of thick filament not overlapped by thin filament - (i) H-zone

So, the correct answer is 'A-(iii),B-(iv), C-(ii), D-(i)'.