Molecular Basis Of Inheritance Question 146
Question: The given figure shows lac operon model and its functioning. Select the option which correctly labels A, B, X, Y and Z marked in the figure and also identify the label (L) which is primarily responsible for the hydrolysis of the disaccharide, lactose, into galactose & glucose.
Options:
A) A B X Y Z L Repressor Inducer $ \beta $ -Galactosidase Permease Transacetylase X
B)
Repressor Inducer Permease $ \beta $ - Galactosidase Transacetylase Y
C)
Inducer Repressor $ \beta $ - Galactosidase Permease Transacetylase Z
D)
Inducer Repressor $ \beta $ - Galactosidase Transacetylase Permease B
Show Answer
Answer:
Correct Answer: A
Solution:
[a] In the given figure of lac operon model (proposed by Jacob and Monad), the labels A, B, X, Y and Z are respectively represser, inducer, $ \beta $ - galactosidase (z), permease (y), transacetylase [a], z, y and a are three structural genes which produces three enzymes for the degradation of lactose to glucose and galactose.
Label X (P- galactosidase) is primarily responsible for the hydrolysis of disaccharide lactose into galactose and glucose.
BETA
