Arrange the correct sequence of steps for gel electrophoresis.
(A). Load this DNA into the agarose gel matrix
(B). Cutting the DNA fragments by using a restriction enzyme
(C). Use ethidium bromide for DNA staining
(D). Separated bands of DNA are cut out from agarose gel
Choose the correct answer from the options given below.

Host bacterium is made competent to accept DNA by treating it with:

Rauwolfia vomitoria growing in different Himalayan ranges, is an example of :

Select the conditions(s) in which decomposition does not takes place in
A. In warm and moist environment
B. In presence of decomposers
C. In absence of decomposers
D. In absence of detritivores
E. In presence of complex compounds like lignin and chitin.
Choose the correct answer from the options given below:

Sex chromosomes of female in chicken are:

Which one of the following structures is not the male sex accessory duct?

Following are the steps involved in Hershey and Chase experiment to prove DNA as the genetic material.
(A) Blending the cells
(B) Centrifugation of the cells was performed
(C) Growing some bacteriophages on a medium containing radioactive phosphorus and other on radioactive sulfur.
(D) Cells were infected with virus
(E) Observation and established the inference.
Choose the correct answer from the options given below:

Genetically modified plants have been useful in:

The electric field in a copper wire of cross-sectional area \( 2.0 \, \text{mm}^2 \) carrying a current of 1 A is:
(Given: Resistivity of copper \( \rho = 2 \times 10^{-8} \, \Omega\text{.m} \))

IUPAC name of the following compound is :

Assume that an electric field \( (20\hat{i}) \text{ V m}^{-1} \) exists in the region of space. If \( V_0 \) is the potential at the origin and \( V_A \) is the potential at \( x = 1 \text{ m} \), then the potential difference \( V_A - V_0 \) is :

Read the passage carefully and answer the questions
The carbonyl group of aldehydes and ketones is highly polar. The positively charged carbon is readily attacked by electron-rich nucleophile and the negatively charged oxygen atom is attacked by an electro-deficient electrophile. Aldehydes and ketones undergo nucleophilic addition reactions in the presence of acid or a base. The mechanism involves attack of a nucleophile on the electron deficient carbonyl carbon to form a tetrahedral intermediate. A new bond is formed between the carbon and oxygen. Protonation of the anion furnished by the reaction medium yields a neutral addition product. The addition product is same whether the reaction is catalyzed by acid or a base. For example in the presence of base aldehydes and ketones react with hydrogen cyanide to form cyanohydrin.
During nucleophilic addition reaction the carbonyl carbon undergoes a change in hybridization from:

Charge on a conducting metal sphere is present :