During early sea urchin development, which embryonic cells have similar organizer activity to that of amphibian Spemann organizer?

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#Question id: 4143

#SCPH28 | Zoology

It is possible to convert the Cys that is a part of Cys-tRNACys to Ala by a catalytic reduction.  If the resulting Ala-tRNACys were added to a mixture of (1) ribosomes, (2) all the other tRNAs and amino acids, (3) all of the cofactors and enzymes needed to make protein in vitro, and (4) mRNA for hemoglobin, where in the newly synthesized hemoglobin would the Ala from Ala-tRNACys be incorporated?

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#Question id: 684

#SCPH01 Biochemistry

Protein subunits in a multisubunit protein are held to each other primarily by

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#Question id: 17819

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

During RNA extraction, the homogenate is first treated with

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#Question id: 10813

#SCPH06 I Botany

A living cytoplasmic connection penetrate the walls between sieve tube elements and their companion cells; which are often complex and branched on the companion cell side, known as

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#Question id: 934

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

Nitrogen fixation may occur via all of the following bacteria, except