AIDS is a sexually transmitted disease (STD). Find out the correct
statement with reference to it
(A) It is caused by HIV belonging to the retrovirus group.
(B) It can pass through the placenta from an infected mother to her child.
(C) It can be diagnosed using ELISA.
(D) HIV enters into the B-lymphocytes and reproduces to produce progeny
of virus.
Choose the correct answer from the options given below:

Identify the incorrect statements from the following:
A. Phenylketonuria is an autosomal dominant trait.
B. Haemophilia is a sex linked recessive disease.
C. Thalassemia is an autosomal linked recessive blood disease.
D. Colour blindness is an autosomal linked recessive disorder.
Choose the correct answer from the options given below:

The big holes in Swiss cheese are due to:
(A) Production of large amount of \(O _2\)
(B) Production of large amount of \(CO _2\)
(C) Production of large amount of \(H _2\)
(D) Bacterium Propionibacterium sharmanii
(E) Lactobacillus casei
Choose the correct answer from the options given below:

The female reproductive system consists of :
(A) Ovaries
(B) External genitalia
(C) Cervix and vagina
(D) Oviducts and uterus
Choose the most appropriate answer from the options given below:

'Species richness contributes to the well being of an ecosystem' was explained through an analogy the rivet popper hypothesis'. The hypothesis was given by :

Read the following paragraph and answer the given questions:
In order to link the alien DNA, the vector needs to have very few, preferably single, recognition sites for the commonly used restriction enzymes. Presence of more than one recognition site in the vector will generate several fragments, which will complicate the gene cloning. In order to link the alien DNA, the vector needs to have very few, preferably single, recognition sites for the commonly used restriction enzymes. Presence of more than one recognition sites within the vector will generate several fragments, which will complicate the gene cloning. The ligation of alien DNA is carried out at a restriction site present in one of the two antibiotic resistance genes. The recombinant plasmids will lose tetracycline resistance due to insertion of foreign DNA but can still be selected out from non-recombinant ones by plating the transformants on tetracycline containing medium.
The recombinants will grow in ampicillin containing medium but not on that containing tetracycline. But, non- recombinants will grow on the medium containing both the antibiotics. In this case, one antibiotic resistance gene helps in selecting the transformants, whereas the other antibiotic resistance gene gets 'inactivated due to insertion' of alien DNA, and helps in selection of recombinants. Origin of replication (ori) is a sequence from where replication starts and any piece of DNA when linked to this sequence can be made to replicate within the host cells. This sequence is also responsible for controlling the copy number of the linked DNA. So, if one wants to recover many copies of the target DNA it should be cloned in a vector whose origin support has high copy number.
Which one of the given sites is commonly used by the restriction enzyme?

Which of the following animal shows adaptive radiation?

Manganese ions on reaction with peroxydisulphate ions form :

In grass families, the cotyledon is called as:

The wavelength of emitted wave due to energy transition in hydrogen atom from n = 3 to n = 2 energy level will be

The shortest distance between the lines \(\vec{r}_1=\hat{i}+\hat{j}+\lambda(2 \hat{i}-\hat{j}+\hat{k})\) and \(\vec{r}_2=2 \hat{i}+\hat{j}-\hat{k}+\mu(4 \hat{i}-2 \hat{j}+2 \hat{k})\) is :

Two long straight parallel wires are carrying charges \( \lambda_1 \) and \( \lambda_2 \) per unit length, respectively. The separation between their axes is d. The magnitude of the force exerted on unit length of one wire due to the charge on the other wire is

The separation between an electron and a proton in a hydrogen atom is \( 0.83 \text{ \AA} \). Find the electric force of attraction between them.