Zoology - Online Test
An operon is a cluster of coordinately regulated genes. It includes structural genes (generally encoding enzymes), regulatory genes (encoding, e.g. activators or repressors) and regulatory sites (such as promoters and operators).
The type of control is defined by the response of the operon when no regulatory protein is present.
The inducer–repressor control of the lac operon is an example of negative control, in which expression is normally blocked.
In contrast, the CAP-cAMP system is an example of positive control, because expression of the lac operon requires the presence of an activating signal.
Assertion: The first milk after the birth of baby is called colostrum.
Reason: Colostrum is rich in proteins, calories and antibiotics.
a. Formation of primary transcript
b. Regulation of splicing
c. Transport of mRNA from nucleus to cytoplasm>
d. Translation
Assertion: Breast-feeding during the initial period of lactation is recommended by doctors for bringing up healthy baby.
Reason: initial period of lactation contain colostrum that contain several antibodies.
