The yeast S. cerevisiae exists in three forms: two haploid cells of different mating types—a and alpha and the diploid formed when an a and an a cell mate and fuse. The a cell and the a cell each encodes cell-type-specific regulators: a cells make the regulatory protein a1, and alpha cells make the proteins alpha1 and alpha2. A fourth regulatory protein, called Mcm1, is also involved in regulating the mating-type-specific genes (and many other genes) and is present in both cell types which shows Combinatorial Control.

The arrangement of regulators at the promoters of a-specific genes and a-specific genes is

cell type:	gene regulatory proteins:	target genes:
1.a cell (haploid)	a1 Mcm1	aSG alphaSG
2.αlpha cell (haploid)	alpha 1 alpha 2 Mcm2	hSG
3.a/αlpha cell (diploid)	a1 Mcm2 alpha2

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#Question id: 22024

#Unit 1. Molecules and their Interaction Relevant to Biology

Some of the statements regarding competitive inhibition are given below

a)  The effect of a competitive inhibitor depends on the inhibitor concentration, the substrate       concentration and the relative affinities of the substrate and the inhibitor for the enzyme.

b) if the substrate concentration is low, the degree of inhibition will be great.

c) the substrate concentration is high, then the degree of inhibition will be marked low

d) non-competitive inhibitor can combine with an enzyme molecule to produce a dead-end complex

Choose the incorrect statement

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#Question id: 22025

#Unit 1. Molecules and their Interaction Relevant to Biology

The Lineweaver-Burk equation in the presence of a competitive inhibitor will be: and Lineweaver-Burk plot showing the effect of competitive inhibition are shown

       

                      

What will be the value of X and X’ for above graph

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#Question id: 22060

#Unit 1. Molecules and their Interaction Relevant to Biology

Km can be calculated from two ways from Lineweaver-Burk equation, choose the most appropriate one

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#Question id: 22937

#Unit 5. Developmental Biology

Gene for regulatory pathway that promotes flowering of Arabidopsis in long days:

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#Question id: 22938

#Unit 5. Developmental Biology

Genes that regulate flowering, have different transcription factors and functions:

 

Choose correct match:

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#Question id: 22939

#Unit 5. Developmental Biology

CO gene expression appears to be highest in the companion cells of the phloem of leaves and stems, the downstream target gene of CONSTANS is