The polypeptide chains A and B in Insulin are linked together by:

Which forest also known as the 'lungs of the planet earth'?

Read the following paragraph and answer the given questions.
Cancer detection is based on biopsy and histopathological studies. Techniques like radiography (use of X-rays), CT (computed tomography) and MRI (magnetic resonance imaging) are very useful to detect cancers of the internal organs. Do you know why mother's milk is considered very essential for the new-born infant? The yellowish fluid colostrum secreted by mother during the initial days of lactation has abundant antibodies (IgA) to protect the infant. Different species of Plasmodium (P. vivax, P. malaria and P. falciparum) are responsible for different types of malaria. Of these, malignant malaria caused by Plasmodium falciparum is the most serious one and can even be fatal. The exaggerated response of the immune system to certain antigens present in the environment is called allergy. The use of drugs like anti-histamine, adrenalin and steroids quickly reduce the symptoms of allergy. Drugs like barbiturates, amphetamines, benzodiazepines, and other similar drugs, that are normally used as medicines to help patients cope with mental illnesses like depression and insomnia, are often abused. Morphine is a very effective sedative and painkiller, and is very useful in patients who have undergone surgery..
The drug, which is very effective sedative and painkiller and useful for patients who have undergone surgery is -

Gause's 'Competitive Exclusion Principle' states that :

Which of the following enzymes join the sticky ends in recombinant DNA technology?

Which one of the following structure is haploid (n) in relation to male reproductive system?

The probability of having a haemophilia carrier daughter by a haemophilia carrier mother and a normal father is :

The genetically identical plants grown by the process of micropropagation are called

An electron having charge \( 1.6 \times 10^{-19} \text{ C} \) and mass \( 9 \times 10^{-31} \text{ kg} \) is moving with \( 4 \times 10^6 \text{ m/s} \) speed in a magnetic field \( 2 \times 10^{-1} \text{ T} \) in a circular orbit. The force experienced by the electron and the radius of the circular orbit, respectively will be:

The shortest wavelength present in the Lyman series of spectral lines is : (Given Rydberg constant \( R = 1.097 \times 10^7 \text{ m}^{-1} \))

Which of the following is NOT correct about the Central Limit Theorem?

If a revenue function is given by \(R(x)=2027 x-1013 x^2-675 x^3\), then the marginal revenue function \(( MR )\) is :

Read the following passage given below and answer the question.
Aldehydes and ketones undergo nucleophilic addition reactions. A nucleophile attacks the electrophilic carbon atom of polar carbonyl group from perpendicular to plane of \(sp^2\) hybridised orbitals of carbonyl carbon. The hybridisation of carbon changes from \(sp^2\) to \(sp^3\) and a tetrahedral alkoxide intermediate is formed. This captures \(H^+\) to give neutral product. In carboxylic acids, carbonyl carbon is less electrophilic than carbonyl carbon in aldehydes and ketones.How will you convert acetaldehyde to lactic acid ?