Choose the correct match.

Germ layers specifying signals	Result
a.     If either Nodal or Vg1 signaling is blocked	i.               No ectoderm induction
b.     If vegT mRNA depleted	ii.              No endoderm induction
c.     If smad2 phosphorylation inhibited	iii.            No mesoderm induction
	iv.            Ectoderm only

#Question id: 685

#Unit 1. Molecules and their Interaction Relevant to Biology

A protein has a molecular weight of 5600 daltons; its subunits are about 1960 daltons. There are ________ protein chains per oligomer.

#Question id: 19475

#Unit 12. Applied Biology

#Question id: 32511

#Unit 1. Molecules and their Interaction Relevant to Biology

#Question id: 28662

#Unit 2. Cellular Organization

At which phase of the cell cycle loading and unloading of cohesins occur ?

#Question id: 15818

#Unit 8. Inheritance Biology

You and your lab partner have isolated 20 new mutant yeast strains that are defective in synthesis of threonine, an amino acid. These Thr- mutants do not grow on minimal medium, but they do grow on minimal medium supplemented with threonine. Ten of your Thr- mutants (numbered 1 through 10) were isolated in a strain of mating type a (MAT a). The other 10 Thrmutants (numbered 11 through 20) were isolated in a strain of mating type α (MAT α). You and your lab partner cross each of the MAT a strains to each of the MAT α strains, and you include crosses to the appropriate wild-type strains. Your experimental observations are shown in the table below, where (-) indicates diploids that did not grow on minimal medium and (+) indicates diploids that did grow on minimal medium.

What is the maximum number of genes that these 20 mutants could represent?