#Question id: 7028
#Unit 5. Developmental Biology
Between the blastoderm and the yolk of avian eggs is a space called the subgerminal cavity, which is created when:
#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?
#Question id: 28319
#Unit 5. Developmental Biology
In case of mammalian fertilization slow block to polyspermy occur when enzymes released by the cortical granules modify the zona pellucida sperm receptor proteins such that they can no longer bind sperm. such enzyme is known as____
#Question id: 23575
#Unit 8. Inheritance Biology
#Question id: 3986
#Unit 3. Fundamental Processes
Consider the lac operon of E. coli. When there is neither glucose nor lactose in the growth medium: