A mutant strain of `T_4` – Bacteriophage, R-II, fails to lyse the E-Coli but when two strains `R-II^X` and `R-II^Y` are mixed then they lyse the E.Coli. What may be the possible reason : -

A mutant strain to T_4 -Bacteriophage, R-II, fails to lyse the E.coli but when two strains R- II^x and R- II^y are mixed then they lye the E.coli. What may be the possible reason :

R-II strain of T_(4) bacteriphasge connot lyse Escherichia cloi .Two of its types , R-II^(x) "and" T-II^(y) were allowed to invade the bacterium which lysed because of

What is the speed of the current? I. Speed of the boat is 4 km/hr in still water. II. The boat runs at a speed of 6 km/hr down-stream. III. The difference between the speeds of the boat while travelling in still water and downstream is 2 km/hr. a. on l y I a n d I I b. on l y I I I c. A n y on e of t h e t h r e e d. on l y e i t h e r I I or I I I e. either I and II together or only III

Assertion (A) : Flagella is essential to seek out a nutritionally more favorable enviroment. Reason (R ) : When E-coli are cultured in medium rich in glucose they lack flagella when grown in nutritionally poor medium they possess flagella.

A cell of emf E and internal resistance r is connected to two external resistance R_(1) " and " R_(2) and a perfect ammeter. The current in the circuit is measured in four different situations : (ii) with resistance R_(1) only

Assertion : Origin of replication (ori) is a definite region in E. coli DNA where the replication originates. Reason : The vectose in r-DNA procedures provide the origin of replication.