At which developmental stage should one be able to first distinguish a diploblastic embryo from a triploblastic embryo?

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#Question id: 1142

#Unit 4. Cell Communication and Cell Signaling

Of the components of a heterotrimeric G protein, which subunit(s) is(are) able to activate downstream responses?

TLS Online TPP Program

#Question id: 12980

#Unit 10. Ecological Principles

The following questions refer to Figure which depicts the age structure of three populations.

Which population is in the process of decreasing?

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#Question id: 16131

#Unit 13. Methods in Biology

You are studying regulation of the yeast enzyme glutamine synthetase (GS), which is encoded by the GLN1 gene. You have isolated two mutants, designated gln2– and gln3–, that give decreased GS activity. Mating of either gln2– or gln3– haploids to wild type produces heterozygous diploids that show normal amounts of GS expression. When you cross either a gln2– or gln3– haploid to a gln1– strain the resulting diploids show normal expression of GS.              

 How many units of ß-galactiosidase would you expect to be expressed from deletion 4 in a gln2– mutant?

TLS Online TPP Program

#Question id: 27980

#Unit 1. Molecules and their Interaction Relevant to Biology

The proton-motive force has 

a. chemical potential energy due to proton-proton repulsion

b. chemical potential energy due to H+ difference in the two regions separated by the membrane 

c. electrical potential energy H+ difference in the two regions separated by the membrane 

d. electrical potential energy due to proton-proton repulsion

Which of the following is true

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#Question id: 1565

#Unit 4. Cell Communication and Cell Signaling

Which of the following are symptoms of inflammation that might appear in such art?