Acquired immunity is characterised by memory. Identify the sequence in which it happens :
(A) Subsequent encounter of the body with same pathogen
(B) Primary response is produced when the body encounter pathogens for the first time
(C) T-lymphocytes help B-lymphocytes to produce an army of proteins
(D) Body exhibits highly intensified anamnestic response
Choose the correct answer from the options given below:

Which of the following is TRUE for gel electrophoresis ?
(A) It is used to separate DNA fragments.
(B) Separation of DNA occurs on the basis of the fragment size.
(C) Separation of DNA fragments occurs on the basis of charge.
(D) Separated DNA fragments can be visualised without staining.
Choose the correct answer from the options given below:

Arrange the given stages in spermatogenesis sequentially :
(A) Spermatid
(B) Primary spermatocytes
(C) Spermatogonia
(D) Secondary spermatocytes
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Which one of the given statements defines the term 'parturition'?

Arrange the steps of gel electrophoresis in a proper sequence :
(A) Fragments of DNA are separated under an electric field in agarose gel
(B) DNA bands are cut out from the agarose gel and extracted
(C) DNA fragments are visualized by exposure to UV radiation
(D) Separated DNA fragment stained with ethidium bromide
Choose the correct answer from the options given below

Read the following passage carefully and answer the given questions.
Insulin consists of two short polypeptide chains- chain A and chain B, that are linked together by disulphide bridges. Some strains of Bacillus thuringiensis produce proteins that kill certain insects such as lepidopterans, coleopterans and dipterans. Bt toxin protein is converted into an active form of toxin due to the alkaline pH of the gut which solubilise the crystals. Transgenic animals that produce useful biological products can be created by the introduction of the portion of DNA (or genes) which codes for a particular product such as human protein (alpha-1-antitrypsin) used to treat emphysema. Plants, bacteria, fungi and animals whose genes have been altered by manipulation are called Genetically Modified Organisms (GMO). GM plants have been useful in many ways. Genetic modification has: (i) made crops more tolerant to abiotic stresses. (ii) reduced reliance on chemical pesticides (pest-resistant crops). (iii) helped to reduce post harvest losses. (iv) increased efficiency of mineral usage by plants (this prevents early exhaustion of fertility of soil). (v) enhanced nutritional value of food.
Identify the incorrect fact about genetic modification.

Gene therapy is a collection of methods for:

The relation \(R\) on the set of real numbers defined by \(R=\left\{(a, b): a \leq b^2\right\}\) is

The general solution of the differential equation \(\left(1+e^x\right) d y+y e^x d x=0\), where \(y>0\), is

At \(6 \%\) converted quarterly, the present value of a perpetuity of ₹ 900 payable at the end of each quarter is :

What would be the effective mass of a photon, if the frequencies of radiation is \(6 \times 10^{14} Hz\) ?

Which of the following enzymes are used to clarify the packed juices?
(A) Pectinases
(B) Kinases
(C) Proteases
(D) Nucleases
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If \(y^{\frac{1}{m}}+y^{-\frac{1}{m}}=2 x\), then the value of \(\left(x^2-1\right) \frac{d^2 y}{d x^2}+x \frac{d y}{d x}\) is :