The promoter of the araBAD operon from E. coli is activated in the presence of arabinose and the absence of glucose and directs expression of genes encoding enzymes required for arabinose metabolism. Unlike the cases of lac and gal genes, where a repressor and an activator work together, here two activators work together: AraC and CAP

+ arabinose	AraC binds that sugar and adopts a configuration that allows it to bind DNA as a dimer to the adjacent half-sites, araI1 and araI2
– arabinose	the AraC dimer adopts a different conformation and binds to araO2 and araI1, there is no monomer at site araI2, and so the protein cannot activate the araBAD promoter (araPBAD). This promoter is also controlled by CAP.

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#Question id: 14988

#Unit 4. Cell Communication and Cell Signaling

Which of the following cells contains granules but belongs to the different lineages from granulocytes?

TLS Online TPP Program

#Question id: 14989

#Unit 4. Cell Communication and Cell Signaling

Which of the following cells are considered as a cellular bridge for the innate and adaptive immune system?

TLS Online TPP Program

#Question id: 14990

#Unit 4. Cell Communication and Cell Signaling

Which smaller group of cells that crawl slowly along blood vessels, and that also  migrate into tissues in response to infection can differentiate into specific tissue macrophages ?

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#Question id: 14991

#Unit 4. Cell Communication and Cell Signaling

_____I________in the bone, _____II_______in the central nervous system, and _____III_______in the lung and ____IV________in the liver are tissue-specific examples of macrophages with these properties.

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#Question id: 14992

#Unit 4. Cell Communication and Cell Signaling

Given cell types contains granules, which perform different function such as;

CELL TYPE	MOLECULES IN GRANULE	FUNCTIONS
A) Neutrophil	i) Chemokines	a) Antiviral activity
B) Eosinophil	ii) Lipid mediators	b) Vasodilation
C) Basophil	iii) Antimicrobial proteins	c) Modulation of adaptive immune response
D) Mast cell	iv) Histamine	d) Regulation of inflammation
	v) Cytokines	e) Direct harm to pathogens
	vi) Ribonucleases

Match the given following  cells with their correct functions of granules?

TLS Online TPP Program

#Question id: 14993

#Unit 4. Cell Communication and Cell Signaling

CD-56 marker found on ?