The DNA polymerase is a template-directed enzyme that synthesizes new complementary strand from a parent strand but it requires the existing short nucleotide sequence for its elongation. Which of the following enzyme is required for the synthesis of this primer?

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#Question id: 18498

#XL - Q Biochemistry

Calculate the percentage of histidine that has its imidazole side chain protonated at pH 7.3. The pKa values for histidine are pK1 = 1.8, pK2 (imidazole) = 6.0, and pK3 = 9.2.

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#Question id: 12760

#XL - R Botany

Which of the examples below provides appropriate abiotic and biotic factors that might determine the distribution of the species in question?

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#Question id: 13205

#XL - R Botany

The mechanisms that regulate the loading of sucrose from the apoplast to the sieve elements by the sucrose–H+ symporter await characterization. Possible regulatory factors include the following:

a) The solute potential or, more likely, the turgor pressure of the sieve elements

b) Sucrose concentration in the apoplast

c) The available number of symporter protein molecules

Which one of the mechanism that involve to regulate the loading of sucrose?

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#Question id: 19612

#XL - P Chemistry

In which of the following pairs, the two molecules have identical bond orders:

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#Question id: 20135

#XL - P Chemistry

Calculate ΔH at 358 K for the reaction

Fe2O3(s) + 3H2(g) → 2Fe (s) + 3H2O(l)

Given that, DH298= – 33.29 kJ mole^–1 and Cp for Fe₂O₃ (s), Fe (s), H₂O (l) and H₂ (g) are

103.8, 25.1, 75.3 and 28.8 J/K mole.