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: 2019

#Unit 4. Cell Communication and Cell Signaling

Which of the following is not a component of an insectʹs defense against infection?

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#Question id: 2020

#Unit 4. Cell Communication and Cell Signaling

Which statement best describes the difference in responses of effector B cells (plasma cells) and cytotoxic T cells?

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#Question id: 2021

#Unit 4. Cell Communication and Cell Signaling

Which one of the following is not true for class 2 MHC protein?

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#Question id: 2022

#Unit 4. Cell Communication and Cell Signaling

Which one of the following is not true for class 1 MHC protein?

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#Question id: 2023

#Unit 4. Cell Communication and Cell Signaling

Which of the following is a pathway that would lead to the activation of cytotoxic T cells?

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#Question id: 2024

#Unit 4. Cell Communication and Cell Signaling

According to this figure which line is not true?