In a plant species, flower color purple is dominant over white. One such purple-flowered plant upon selfing produced 35 viable plants, of which 9 were white flowered and the rest were purple flowered. What fraction of these purple-flowered progeny is expected to be pure purple-flowered line?

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#Question id: 15182

#SCPH28 | Zoology

Which of the following types of effect are responsible for lowering the efficiency of electrophoresis?

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#Question id: 15620

#SCPH01 Biochemistry

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. What does this result tell you about the relationship between the lac3– and lac1- mutations?  

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#Question id: 1097

#SCPH01 Biochemistry

A signal transmitted via phosphorylation of a series of proteins is generally associated with which of the following events?

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#Question id: 27374

#SCPH28 | Zoology

An aqueous solution contains two compounds X and Y. This solution gave absorbance values of 1.0 and 0.4 at 220 and 280 nm, respectively, in a 1 cm path length cell. Molar absorption coefficients (ε) of the compounds X and Y are as shown in the table below.

The concentration of Y in the solution is___________ mM.

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#Question id: 2982

#I Life Science/ Life Sciences Group – I-V

Match the following proteins (Column I) with their functions (Column II) during cell cycle.

Column I	Column II
A. Cdc25C phosphatase	i. Activates vertebrate S phase CDKs
B. INK4	ii. Activation of Mitotic CDKs
C. Cdc25A phosphatase	iii. Binds and inhibits G1 CDKs
D. APC/CCdc20	iv. Degradation of securin