Local cell signaling is carried out via membrane receptors that bind to proteins in the extracellular matrix (ECM) or directly to receptors from a neighboring cell in a process called as-

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#Question id: 11627

#Unit 8. Inheritance Biology

The interaction of two loci that determine fruit color in summer squash, which is commonly found in one of three colors: yellow, white, or green. When a homozygous plant that produces white squash is crossed with a homozygous plant that produces green squash and the F1 plants are crossed with each other, the following results are obtained:

 12/16 plants with white squash

 3 /16 plants with yellow squash

 1 /16 plants with green squash

 This is the case of___

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#Question id: 33984

#Unit 2. Cellular Organization

Choose correct combination of statements 

A. Each chromosome contains many fragments of very long duplex of DNA, folded into a fiber that runs continuously throughout the chromosome.

B. During interphase, euchromatin, which is slightly densely packed than mitotic chromosomes. 

C. Regions of heterochromatin remain densely packed throughout interphase.

D. Various heterochromatic regions, especially those associated with centromeres, aggregate into a densely staining chromocenter

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#Question id: 114

#Unit 1. Molecules and their Interaction Relevant to Biology

Sphingosine is not a component of

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#Question id: 15621

#Unit 13. Methods in Biology

Wild type E. coli metabolizes the sugar lactose by expressing the enzyme ß-galactosidase. You have isolated a mutant that you call lac1–, which cannot synthesize ß-galactosidase and cannot grow on lactose (Lac–). During an condition Lac– strain, called lac3–, is linked to the Tn5 insertion. From a strain carrying the Tn5 insertion and lac3– mutation you isolate an F’ that caries a region of the chromosome that includes both Tn5 and the linked Lac region. Introduce this F’ into an F– strain carrying lac1– by selecting for Kanr. These merodiploids express ß-galactosidase normally. If the merodiploid were Lac–, 

a) the two mutations lie in the different gene.

b) Both mutation are complement each other

c) the two mutations lie in the same gene.

d) Both of the mutations is dominant to wild type.

what could you conclude about the relationship between the lac3– and lac1– mutations from  these statements?

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#Question id: 6976

#Unit 5. Developmental Biology

What is the major concern of using retroviral vectors to deliver or activate pluripotent genes?