The larvae of some insects are merely small versions of the adult, whereas the larvae of other insects look completely different from adults, eat different foods, and may live in different habitats. Which of the following most directly favors the evolution of the latter, more radical, kind of metamorphosis?

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#Question id: 1727

#XL - Q Biochemistry

Which of the following statements is TRUE of CD4?

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#Question id: 1728

#XL - Q Biochemistry

Which of the following is characteristic of B- but not T-cells?

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#Question id: 1729

#XL - Q Biochemistry

When a resting naive T-cell engages its specific MHC–peptide complex displayed on the surface of a fibroblast, it:

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#Question id: 1730

#XL - Q Biochemistry

What is the T-cell ligand binding B7 on a professional antigen-presenting cell?

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#Question id: 1731

#XL - Q Biochemistry

Which of the following statements is TRUE of Sos (Son of sevenless)?

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#Question id: 1732

#XL - Q Biochemistry

Protein tyrosine kinase activity following T-cell stimulation: