The accumulation of abnormally folded proteins and unassembled subunits in the ER can induce increased expression of ER protein-folding catalysts via:

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#Question id: 14836

#Unit 5. Developmental Biology

In the case of the French flag model. we assume a source of morphogen at one end and a sink at the other and that the concentrations of morphogen at both ends are kept constant but are different from each other. If the cells can respond to threshold concentrations of the morphogen, Thresholds can represent the

a. amount of morphogen that must bind to receptors to activate an intracellular signaling system. 

b. concentrations of transcription factors required to activate particular genes.

c. concentration at any point effectively provides positional information.

d. amount of morphogen that must bind to receptors to inactivate an extracellular signaling system.

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#Question id: 1943

#Unit 4. Cell Communication and Cell Signaling

What is HLA-DR2 a risk factor for?

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#Question id: 15191

#Unit 8. Inheritance Biology

Genes that control coat color in mammals represent some of the best early examples of genes with multiple alleles exhibiting different phenotypes. A classic example is the C gene in hamsters. Three of the known alleles of this gene are C, c^k and c^a. Each supplies a different amount of black pigment to the coat hair. The phenotypes of three different homozygous strains are as follows.

Based on the concepts of dominance, determine whether ck and ca were dominant or recessive alleles by crossing the true-breeding sepia hamsters to true-breeding black hamsters. From the resulting F1 progeny phenotype, what would be the ratio of F2 phenotype

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#Question id: 16498

#Unit 12. Applied Biology

Chromosomal gene of agrobacterium needed for an optimal expression of vir genes of pTi

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#Question id: 19871

#Unit 13. Methods in Biology

What will be the major property of Restriction enzyme ?

a) cleaves only double stranded DNA

b) Restriction of foreign genome

c) Methylation of host genome using SAM

d) Acetylation of host genome using acetylcoA