In Correct Order, from External to Internal, the Layers of the Testis

question 19

Multiple Choice

In correct order, from external to internal, the layers of the testis include:
(1) dartos muscle
(2) cremaster muscle
(3) tunica vaginalis
(4) scrotal cavity
(5) tunica albuginea
(6) septa

• A) 1, 2, 3, 4, 5, 6
• B) 6, 5, 4, 3, 2, 1
• C) 2, 4, 6, 3, 5, 1
• D) 5, 3, 4, 2
• E) None of the answers are correct.

---

Definitions:

XIST Gene

A gene that is crucial for X-chromosome inactivation, a process that occurs in females to prevent the overexpression of X-linked genes.

Barr Body

A Barr Body is an inactivated X chromosome found in the cell nuclei of female mammals, visible as a dense mass.

Lac Operon

A group of genes with a single promoter that are involved in the transport and metabolism of lactose in bacteria and regulated together.

Escherichia Coli

A species of bacteria found in the intestines of animals and humans; some strains can cause food poisoning.