Question

1. in an eye cell, which of the following gene sections would be transcribed?

a. the eye switch
b. the arm switch
c. the protein x coding region
d. a and c
e. all of the above

1. in an eye cell, which of the following proteins would be present?

a. an activator for the eye switch
b. an activator for the arm switch
c. protein x
d. both a and c
e. all of the above

Explanation:

• For question 2:
• Gene switches (like the eye switch) are regulatory regions. They are not transcribed themselves but help regulate the transcription of coding regions. The protein - coding region (protein X coding region) is transcribed. Since the eye switch is a regulatory element (not transcribed) and the arm switch is for a non - eye cell (so not relevant in an eye cell), only the protein X coding region is transcribed.
• For question 3:
• In an eye cell, the activator for the eye switch is present to turn on genes related to eye function. The protein X (coded by the transcribed region) is also present. The activator for the arm switch is not present in an eye cell as it is specific to arm cells.

Answer:

1. C. The protein X coding region
2. D. Both A and C