Typical embryo sac at maturity is:

Read the Passage carefully and answer the the questions
The DNA fragments can be separated by a technique known as gel electrophoresis. Since DNA fragments are negatively charged molecules, they can be separated by forcing them to move towards the anode under an electric field through a medium/matrix. The separated DNA fragments can be visualised only after staining the DNA with a compound known as ethidium bromide followed by exposure to UV radiation. The repeated amplification of DNA is achieved by the use of a thermostable DNA polymerase (isolated from a bacterium, Thermus aquaticus). After completion of the biosynthetic stage, the product has to be subjected through a series of processes before it is ready for marketing as a finished product. The downstream processing and quality control testing vary from product to product. The convention for naming restriction enzymes is the first letter of the name comes from the genus and the second two letters come from the species of the prokaryotic cell from which they were isolated.
The downstream processing does not include -

HIV primarily destroys which cells of the immune system?

The number of chromosomes in the gamete of a house fly is:

A nucleoside comprises:

Which is not the male sex accessory gland?

Plasmodium enters the human body as:-

The relation \(R\) on set \(A=\{1,2,3,4,5\}\), given by \(R=\{(a, b):|a-b|\) is even \(\}\) is :

If y = - 4 a root of \(\left|\begin{array}{lll}y & 2 & 3 \\ 1 & y & 1 \\ 3 & 2 & y\end{array}\right|=0\), then the product of the other two roots is

Match List-I with List-II

List-I	List-II
(A) AC generator	(I) Michael Faraday
(B) Polarity of induced emf	(II) Foucault
(C) Electromagnetic Induction	(III) Nicola Tesla
(D) Eddy Current	(IV) Heinrich Friedrich Lenz

Choose the correct answer from the options given below:

A card is selected at random from a pack of 52 playing cards.The selected card is a queen.The probability that this card is a card of spade is :

Match List-l with List-II

List-l (Terms)	List-II (Features)
(A) Allele	(I) The position on the chromosome where a gene occurs
(B) Locus	(II) Testing a suspected heterozygote by crossing it with a known homozygous recessive
(C) Gene	(III) One of two or more alternative nucleotide sequences at a single gene locus
(D) Test Cross	(IV) A length of DNA that codes for a particular polypeptide or protein

Choose the correct answer from the options given below:

The value of is \(\left|\begin{array}{cc}x^2-x+1 & x-1 \\ x+1 & x+1\end{array}\right|\) equal to