Methanogens do not produce:

Which of the following is a stop codon?

Which one of the followings is a hormone releasing IUD?

Select and arrange the steps of gel electrophoresis in correct sequence.
(A) Separation of DNA fragments according to their size
(B) Staining of DNA with ethidium bromide
(C) Forcing DNA fragments to move towards anode
(D) Eluting the desired DNA fragments
(E) Visualisation under UV radiation
Choose the correct answer from the options given below:

Match List - I with List - II.

LIST I (Use of transgenic animal)	LIST II (Work done)
A. Emphysema	I. Polio vaccine
B. Human alpha-lactalbumin	II. Rosie
C. Transgenic mice	III. Toxin sensitive transgenic animal
D. Chemical safety testing	IV. α-1-antitrypsin

Choose the correct answer from the options given below:

Observe the figure and answer the following:


What is represented by figure D?

All food chains begin with producers, except -

An electric dipole of length 4 cm, when placed with its axis making an angle of \( 60^{\circ} \) with a uniform electric field, experiences a torque of \( 4\sqrt{3} \text{ N m} \). If the dipole has charges of \( \pm 8 \text{ nC} \), then the potential energy of the dipole in the electric field is:

Match List - I with List - II.

List - I	List - II
(A) RNA	(I) Glycogen
(B) Invert sugar	(II) lactose
(C) Animal starch	(III) Ribose
(D) Milk Sugar	(IV) Sucrose

Choose the correct answer from the options given below :

Observe the figures and answer the question.

The bacteria which grow anaerobically on cellulosic material present in the digester tank of bio-gas plant is.

Which of the following is a free living soil nitrogen fixing bacteria ?

Which of the following factors can influence Hardy-Weinberg equilibrium?
(A) Natural Selection
(B) Genetic recombination
(C) Gene flow
(D) Mutation
Choose the correct answer from the options given below:

Read the passage and answer the question given below.
When a host is exposed to antigens, which may be in the form of living or dead microbes or other proteins, antibodies are produced in the host body. This type of immunity is called active immunity. Active immunity is slow and takes time to give its full effective response. Injecting the microbes deliberately during immunisation or infectious organisms gaining access into body during natural infection induce active immunity. When antibodies are directly given to protect the body against foreign agents, it is called passive immunity.
colostrum secreted by mother during initial stage of lactation provides passive immunity as it is rich in.