What is nucleosome?

The genetic disorder caused due to presence of an additional copy of the chromosome number 21 is:

The structure in the ovary from which corpus luteum formed is known as:

Arrange the following geological periods in their occurrence from latest to oldest order.
(A) Triassic
(B) Carboniferous
(C) Tertiary
(D) Jurassic
Choose the correct answer from the options given below:

Observe the given figures and answer the question

Which of the following labels in Figure III correctly represent the protective sheaths of embryo?
A. E - Coleoptile
B. F - Coleorhiza
C. G - Plumule
D. H - Radicle

A novel strategy to prevent infestation of roots of tobacco plant with the nematode Meloidegyne incognitia is :

Which one of the following expressions is used for comparing productivity of different ecosystems?

Read the following paragraph carefully and answer the given questions.
In the year 1963 the two enzymes responsible for restricting the growth of bacteriophage in E. coli were isolated. The first restriction endonuclease - Hind II, whose functioning depended on a specific DNA nucleotide sequence was characterized five years later. It was found that Hind II always cut DNA molecules at a particular point by recognizing a specific sequence of six base pairs. This specific base sequence is known as the recognition sequence for Hind II. Besides Hind II, today we know more than 900 restriction enzymes that have been isolated from over 230 strains of bacteria, each of which recognize different recognition sequences.
In EcoR I the latter 'R' is derived from the -

Van Arkel Method is used for -

Which of the following does NOT serve as biofertilizer in paddy field?

A cylindrical bar magnet is kept along the axis of circular coil. If the magnet is rotated about its axis, then :

Which of the following complexes show linkage isomerism?

An electron in the ground state goes to the first excited state in the hydrogen atom. Arrange the following energies in decreasing order:
(A) Total energy in ground state
(B) Kinetic energy in ground state
(C) Potential energy in ground state
(D) Total energy in first excited state
Choose the correct answer from the options given below: