Following statements are regarding to the early development in sea urchin.

A. most cells of the 16-cell embryo, the large micromeres are autonomously specified.

B. large micromeres inherit maternal determinants that were deposited at the vegetal pole of the egg; these become incorporated into the large micromeres at the fourth cleavage.

C. The conditionally specified large micromeres are now able to produce paracrine and juxtacrine factors that autonomously specify the fates of their neighbors.

D. Large micromeres become skeletogenic mesenchyme cells that will leave the blastula epithelium, enter the blastocoel, migrate to particular positions along the blastocoel wall, and then differentiate into the larval skeleton.

Which of the following statement is false?

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#Question id: 168

#Unit 1. Structure and Function of Biomolecules

 The peptide alanylglutamylglycylalanylleucine has:

TLS Online TPP Program

#Question id: 169

#Unit 1. Structure and Function of Biomolecules

 An octapeptide composed of four repeating glycylalanyl units has:

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#Question id: 170

#Unit 1. Structure and Function of Biomolecules

Desmosine, an uncommon amino acid is derived from

TLS Online TPP Program

#Question id: 171

#Unit 1. Structure and Function of Biomolecules

An amino acid with two chiral carbon atoms

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#Question id: 172

#Unit 1. Structure and Function of Biomolecules

Which amino acid is least likely to participate in acid-base catalysis?

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#Question id: 173

#Unit 1. Structure and Function of Biomolecules

What is the net charge on the tripeptide Gly-Arg-Lys at pH 7? The table below gives the pKaʹs of the ionizable groups on the free amino acids.