Different organisms may preferentially use different codons to encode the same amino acid in the cases of such amino acids that are encoded by more than one codon this is called

#Question id: 13161

#Unit 4. Cell Communication and Cell Signaling

#Question id: 1706

#Unit 4. Cell Communication and Cell Signaling

Which of the following statements is the best example of a primary lymphoid organ?

#Question id: 1058

#Unit 4. Cell Communication and Cell Signaling

Phage-encoded enzymes are

#Question id: 4611

#Unit 11. Evolution and Behavior

Given what we know about evolutionary biology, we expect to find the largest number of endemic species in which of the following geological features, which have existed for at least a few million years?

#Question id: 15815

#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.

Which mutations are dominant?