In a biochemical experiment, you compare the products from splicing reactions carried out in vitro using three different substrates. In each case the substrate is a construct containing a single intron surrounded by two exons, and in all cases the construct is the same overall size. But in one case, the intron is a group I intron, in another a group II intron, and in the third an intron removed by the spliceosome. Each construct is labelled in a manner that allows it to be detected after gel electrophoresis, and each is tested in two reactions—one, conditions that support self-splicing, and two, in the presence of nuclear extract as well. Note that, for simplification, only the final products of the splicing reaction are seen, but before degradation of the introns.

 Which of the following observation is/are correct?

A. In lane A, the presence of nuclear abstract, a band for the lariat and the spliced product and pre-mRNA.

B. Lane B shows Group I Introns and Lane C is for Group II introns and reaction is nonself-splicing

C. Lane C is Group I intron. Splicing takes place in the absence and presence of nuclear abstract, and the reaction is self-splicing.

#Question id: 11714

#Unit 10. Ecological Principles

In recognizing patchiness in the natural world, ecologists have developed three different models of populations. Which of these recognize(s) that there are differences in the quality of habitat patches without considering effects of differences in habitat quality within the habitat matrix?

#Question id: 11715

#Unit 10. Ecological Principles

The lifetime dispersal area of a particular species of drosophila is 0.2 km2. What else would we need to know to determine the neighbourhood size for this species?

#Question id: 11716

#Unit 10. Ecological Principles

Macroecology addresses patterns of range size and population density. Which of the following statements is true?

#Question id: 11717

#Unit 6. System Physiology – Plant

Inhibitors of the third stage of the gibberellin biosynthetic pathway is___

#Question id: 11718

#Unit 6. System Physiology – Plant

The enzymes and genes of the Gibberellin biosynthetic  pathway  have been characterized,  Most notable from a regulatory standpoint are___A) biosynthetic enzymes  and  B) metabolic enzymes involved from which enzymes?

#Question id: 11719

#Unit 6. System Physiology – Plant

Gibberellin conjugates are particularly prevalent in some seeds. The conjugating sugar is usually glucose, and it may be attached to the gibberellin via,

a) a carboxyl group forming a gibberellin glycosyl ether

b) a hydroxyl group forming a gibberellin glycosyl ether

c) a carboxyl group forming a gibberellin glycoside

d) a hydroxyl group forming a gibberellin glycoside

which one of the following is the correct statements about conjugation?