Question

A sequential expression of a set of human genes occurs when a steroid molecule binds to
A. mRNA
B. DNA sequence
C. tRNA
D. Ribosome

Answer 1

Hint: The steroid hormone acts as the chemical messenger and further gets binded with DNA which is found inside the nucleus.

Complete answer:
Steroid molecules are basically the chemical messengers that help in the binding and interaction of DNA molecules inside the nucleus. As we know steroid hormones comprises of sex hormones either can be of male or female so they act on a particular DNA sequence. The sequential expression is the process in the correct sequence that is translation from transcription and then protein formation which further helps in different functions.

The best example of steroid hormones are sex hormones which may be of male or female. So these hormones act on some particular DNA sequence which is termed to be gene or cistron.
So when the steroid hormone acts on the DNA sequence it initiates the process of transcription and the mRNA formed through the process of transcription helps in Translation.
Further the translation process helps in the formation of some proteins and the protein will be functional on some new target area whenever required and this protein for the helps in maturation or Cell differentiation which is known as sequential expression . So the steroid hormone receptor protein Complex helps in the activation of the transcription of the target through getting it binded with some specific DNA sequence.

The correct option is B.

Note: When the ovum albumin synthesis occurs in the oviduct of the chick that is controlled by oestrogen which is a steroid and this is called transcriptional control.