#Question id: 12035
#Unit 7. System Physiology – Animal
#Question id: 15422
#Unit 5. Developmental Biology
#Question id: 16776
#Unit 13. Methods in Biology
If the Mean and Mode are 25, then find the Median.
#Question id: 643
#Unit 1. Molecules and their Interaction Relevant to Biology
The hydrolysis of lactose is catalysed by b-galactosidase as given below
Which of the following could be correct mechanism for this hydrolysis reaction?
A. Nucleophilic attack by the carboxylate group of Glu/Asp on the C-1 carbon atom of the galactose moiety within glucose, releasing glucose and forming an intermediate with the galactose linked to the enzyme through an ester linkage. Water then attacks this carbon atom, displacing the glutamate carboxylate and releasing galactose.
B. Electrophilic attack by the carboxylate group of Glu/Asp on the C-1 carbon atom of the galactose moiety within glucose, releasing glucose and forming an intermediate with the galactose linked to the enzyme through an ester linkage. Water then attacks this carbon atom, displacing the glutamate carboxylate and releasing galactose.
C. Nucleophilic attack by the carboxylate group of Lys/Arg/His or bivalent cation on the C-1 carbon atom of the galactose moiety within glucose, releasing glucose and forming an intermediate with the galactose linked to the enzyme through an ester linkage. Water then attacks this carbon atom, displacing the glutamate carboxylate and releasing galactose.
#Question id: 3637
#Unit 8. Inheritance Biology
Parents that are homozygous for different mutations a, b and c are crossed, producing offspring that are heterozygous as following
aa X bb = ab (X)
bb X cc = bc (Y)
aa X cc = ac (Z)
If a and b belong to same locus but b and c belong to different locus then phenotype of heterozygote