wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

Which enzyme/s will be produced in a cell in which there is a nonsense mutation in the lac y gene?

A
β-galactosidase
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
B
Lactose permease
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
Transacetylase
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
Lactose permease and transacetylase
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is A β-galactosidase

The lac operon of E. coli has three structural genes.
Z secretes β-galactosidase
Y secretes Permease
A secretes Transacetylase
If there is a nonsense mutation in the y gene of the lac operon, then the genes encoding permease and transacetylase are not translated. Since only the lac Z gene is encoded, there is an accumulation of β-galactosidase in the cell.

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
BIOLOGY
Watch in App
Join BYJU'S Learning Program
CrossIcon