Which of the following statements are correct with respect to gametogenesis?
(A) Division in primary oocytes is arrested at Prophase-I
(B) Secondary oocytes are diploid
(C) Spermatogonia undergo meiosis to form primary spermatocytes
(D) Spermatid transformed into spermatozoa by spermiogenesis
Choose the correct answer from the options given below:

Read the passage carefully and answer the given questions.
Recombinant DNA Technology Asexual reproduction preserves the genetic information, while sexual reproduction permits variation. Traditional hybridization procedures used in plants and animals breeding very often lead to inclusion and multiplication of undesirable genes along with the desired genes. The techniques of genetic engineering, which include creation of recombinant DNA, use of gene cloning and gene transfer, overcome this limitation and allow us to isolate and introduce only one or a set of desirable genes without introducing genes into the target organism.
Which one of the following options is correct for working of restriction enzymes?

Arrange the given organs in correct sequence which are involved in life cycle of Plasmodium?
(A) Gut of mosquito
(B) Salivary glands of mosquito
(C) Liver of man
(D) Blood of man
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Which of the following features are required to facilitate cloning?
(A) Presence of origin of replication (Ori) in the cloning vector
(B) Presence of a selectable marker in the cloning vector
(C) Presence of a single recognition site (preferably) for restriction enzyme in the cloning vector
(D) Presence of more than two promoter regions in the cloning vector
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Arrange the given stages involved in replication of retrovirus.
(A) New viral RNA is produced by the infected cell
(B) Viral DNA is produced by reverse transcriptase
(C) Viral DNA is incorporated into host genome
(D) Viral RNA is introduced into animal cell
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Which of the following component was not the part of S.L. Miller's experiment?

The abundant immunoglobulin present in colostrum of mother's milk to create passive immunity in infants is:

The distance between an object and its virtual image of magnification \( \frac{1}{2} \) as produced by a lens is 20 cm.
The focal length of the lens is

If \(f: R \rightarrow R\) is defined by \(f(x)=x^2-3 x+2\) then \(f(f(x))\) is :

A printed page is kept pressed by a glass cube-shaped paper-weight of edge 3.0 cm. The refractive index of the glass is \( \mu = 1.5 \).
By what amount will the printed letters appear to be shifted when viewed from the top?

Arrange the following events in correct sequence :
(A) Virus infects macrophages
(B) Viral DNA is produced by reverse transcriptase
(C) Viral DNA incorporates into host genome
(D) Viral RNA is introduced into macrophages
(E) New viruses are produced
Choose the correct answer from the options given below :

Paleontological evidence for evolution refers to.

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