Protein amino acid side chains can hydrogen bond in the major groove of DNA, and discriminate between each of the four possible base pairs.  In which one of the following groups of amino acids can all three members potentially be used in such DNA-protein recognition?

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#Question id: 17668

#XL - S Microbiology

The most recent common ancestor of all land plants was probably similar to modern-day members of which group? 

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#Question id: 13223

#XL - R Botany

At the endodermis, which pathway is blocked by the Casparian strip

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#Question id: 1055

#XL - T Zoology

What part of the E. coli T4 phage attaches to the host cell receptors?

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#Question id: 4930

#XL - T Zoology

Which of the following is the correct sequence of events in the origin of life?

I. Formation of protocells

II. Synthesis of organic monomers

III. Synthesis of organic polymers

IV. Formation of DNA-based genetic systems

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#Question id: 674

#XL - Q Biochemistry

Proline is not often found in a-helices of proteins because it