Tutor profile: Anmol L.
Subject: SAT II Biology E/M
Considering the lac(lactose) Operon, in the absence of inducer what will happen- a) the repressor is not expressed b)the product of operon act as co-repressors c)the repressor cannot bind the operator d)the genes encoding lacZ,Y,A are not fully transcribed.
Correct answer : d) the genes encoding lacZ,Y,A are not fully transcribed Explanation - Ithe inducer of the operon is only absent then the whole operon will not be synthesized which results in no proper transcription of the genes encoded by the operon.
Subject: Environmental Science
What are the Contents of Red Data Book?
Red Data Book is the source book which contains the list of all the endangered species on this planet. Each Species has its own Red Data Book. This book is based on the research done by Russian Biologist done from 1961 to 1964.
What is the difference between fraternal and Identical twins?
Fraternal Twins : this type of twins result from the fertilization of two different egg cells by two different sperm cells during the same gestation period. They may or may not share the same gender. Like any other siblings they carry 50 father.% genetic material each from the mother and the father. They are also known as Dizygotic Twins. Identical Twins - In this category of twins, the fertilized egg or the zygote splits after fertilization. So in this case both the zygotes share the exact same genetic material(same gender,appearance etc). They are also known as Monozygotic twins.
needs and Anmol will reply soon.