You have isolated two mutations in the Lac operon that cause constitutive expression of Lac genes. You designate these mutants Lac1– and Lac2–. Making use of an F' that carries the Lac operon with the LacY gene mutated, you construct strains that you test for both ß-galactosidase activity and Lac permease activity with results shown below.

     

Classify each mutation as dominant or recessive and as cis- or trans-acting, giving the experimental result that allows you to arrive at each conclusion. Finally, deduce what type of Lac mutation best fits the properties of Lac 1– and of Lac 2–.

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#Question id: 10691

#SCPH28 | Zoology

Following some attributes of biological control agent of parasite

A) General adaptability to the environment.

B) High searching capacity for hosts.

C) K selected strategy

D) Low dispersal ability.

E) Minimal time lag effects in responding to changes in host numbers.

Following above attribute is not ideal for that biological agent?

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#Question id: 11915

#SCPH28 | Zoology

Which of the following is the correct prediction about the three types of model such as; Facilitation, Inhibition, Tolerance model.

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#Question id: 14777

#SCPH06 I Botany

A and B throw a coin alternately till one of them gets a ‘head’ and wins the game. Their respective probabilities of winning are

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#Question id: 3873

#SCPH28 | Zoology

The excision (splicing) of many group I introns requires, in addition to the primary transcript RNA:

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#Question id: 2940

#SCPH28 | Zoology

Chk1is activated by: