Question

Consider the following figure, depicting regions in dsDNA, for Questions 13-17:

13. The indicated items are found in an IgL gene. Which of the labeled elements serves as a spacer?

A. VL
B. 7 bp
C. 12 bp
D. 9 bp
E. None of the above

Answer 1

In the structure of an IgL gene, the element labeled as '7 bp' is referring to a spacer, which is a sequence of seven base pairs that serves as non-coding DNA separating coding segments within the gene.

Step-by-step explanation:

The question pertains to the structure of an IgL gene in dsDNA and asks which labeled element serves as a spacer. A spacer in genetic terms usually refers to non-coding DNA that separates coding sequences such as exons in a gene. In the context of immunoglobulin (Ig) genes, spacers can separate the different segments such as V (variable), J (joining), and C (constant). The correct answer is B. 7 bp, which likely represents a length of base pairs serving as a non-coding spacer region between coding segments in the IgL gene.