The codon for the amino acid specified by the anticodon at the anticodon arm of tRNA is covalently linked to tRNA at the

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#Question id: 15711

#XL - S Microbiology

For the regeneration of a whole plant from a cell or callus tissue, there should be differentiation leading to shoot bud or embryo formation. This may occur through 

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#Question id: 1225

#XL - Q Biochemistry

The dissociation constant Kd for a receptor-ligand complex is

a. a measure of the affinity of the receptor for the ligand.

b. the concentration of the ligand at which half of the receptors contain bound ligand.

c. a measure of the time it takes for a ligand to be converted to a product.

d. equal to koff/kon 

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#Question id: 15189

#XL - S Microbiology

Which of the following  cells control the differentiation of HSCs (hematopoietic stem cells )?

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#Question id: 1752

#XL - Q Biochemistry

Dendritic cells can be driven from a resting state to an activated state by the T-cell surface molecule:

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#Question id: 371

#XL - S Microbiology

How many milliliters of a 2.0 M solution of boric acid must be added to 600 mL of a solution of 10 mM sodium borate in order for the pH to be 9.45? (pKa of boric acid = 9.24)