#Question id: 961
#Unit 1. Molecules and their Interaction Relevant to Biology
Which type of organisms can eliminate excess nitrogen by the direct excretion of ammonia?
#Question id: 15816
#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 do you know to be in the same gene?
#Question id: 4001
#Unit 3. Fundamental Processes
Which is not true about the lac repressor?
#Question id: 1975
#Unit 4. Cell Communication and Cell Signaling
Which of the following differentiates T cells and B cells?
#Question id: 32324
#Unit 1. Molecules and their Interaction Relevant to Biology