The elucidation of the lac operon was the result of close association between the geneticist _________ and the biochemist _________.

About __________ the first cellular forms of life appeared on earth

Identify the set of cells which have haploid number of chromosomes ?

Match List-I with List-II

List-I (Hormones)	List-II (Locations/Functions)
(A) hCG	(I) Released in the later phase of pregnancy
(B) LH Surge	(II) Uterine contractions
(C) Oxytocin	(III) Placenta
(D) Relaxin	(IV) Ovulation

Choose the correct answer from the options given below:

Observe the given figures and answer the question

In Figure III, which of the following statements is correct regarding the labelled parts?
A. H represents the radicle, which develops into the root system
B. E represents the coleorhiza, protecting the plumule
C. J represents the endosperm, which stores food
D. K represents the testa, derived from integuments

A DNA fragment contains 18% Thymine (T). The combined content of Cytosine (C) and Guanine in it would be:

Australian marsupials show the phenomena of:

Read the given passage and answer the following questions:
Secondary treatment or biological treatment: The primary effluent is passed into large tanks where air is pumped into it. This allows vigorous growth of aerobic microbes. While growing, these microbes consume the major part of the organic matter in the effluent. This significantly change the BOD (biochemical oxygen demand) of the effluent. The effluent in then passed into a tank a small part of the sludge is pumped back into the aeration tank to serve as the inoculum. The remaining major part of the sludge is pumped into large tanks called sludge digesters. Here, other kinds of bacteria grow anaerobically in the sludge. The biogas produced can be used source of energy as it is inflammable. The effluent from the secondary treatment plant is generally released into natural water bodies like rivers and streams.
The greater the BOD of water

Which of the following statement(s) is (are) not associated with \(\text{S}_\text{N}1\) reaction:
(A) Rearrangement is possible.
(B) The rate is affected by solvent polarity.
(C) The strength of nucleophile is involved in rate determining step.
(D) The reaction order of alkyl halides is tertiary > secondary > primary.
(E) Proceeds with complete inversion of configuration.
Choose the correct answer from the options given below :

A spherical balloon has a variable radius. The rate at which its volume is increasing with respect to its radius when the radius is 5 cm is:

The area (in sq. units) of the region bounded by the curve \(x^2 = 250y, y = 0\) and \(x = 50\) is

Two particles \( P_1 \) and \( P_2 \), having equal charges accelerated by the same potential difference enter a region of uniform magnetic field and describe circular paths of radii \( R_1 \) and \( R_2 \), respectively. The ratio of the mass of \( P_1 \) to that of \( P_2 \) will be

Read the following passage carefully.
Restriction enzyme
Restriction enzymes cut the strand of DNA a little away from the center of the palindrome sites, but between the same two bases on the opposite strands. This leaves single stranded portions at the ends. There are overhanging stretches called sticky ends on each strand. These are named so because they form hydrogen bonds with their complementary cut counterparts. This stickiness of the ends facilitates the action of the enzyme DNA ligase. The word palindromes refer to group of letters that forms the same words when read both forward and backward. Restriction endonucleases are used in genetic engineering as molecular scissors.
Overhanging stretches on each strand is called: