During interphase, DNA replication occurs during the _____ part.

A. within the cartilage divide and secrete new matrix:Chondroblasts are immature cartilage cells responsible for producing and secreting the extracellular matrix, including collagen and proteoglycans. They actively divide and contribute to cartilage growth, especially at the periphery (appositional growth).

B. remain in compact bone even after the epiphyseal plate closes:This description more closely matches osteocytes in bone, not chondroblasts. Chondroblasts are specific to cartilage and do not persist in compact bone after growth plates close.

C. are mature cartilage cells located in spaces called lacunae:This describes chondrocytes, the mature form of cartilage cells that reside in lacunae and maintain the matrix, rather than actively secreting it like chondroblasts.

D. never lose their ability to divide:Chondroblasts can divide while immature, but once they mature into chondrocytes, their division is very limited. Therefore, they do lose much of their proliferative capacity after maturation.

A. a cutaneous plexus:The cutaneous plexus is a network of blood vessels located in the dermis that supplies nutrients to the skin. It is not related to the formation of dermal folds or lines at joints.

B. cleavage lines:Cleavage lines, or tension lines, indicate the natural orientation of collagen fibers in the dermis. They guide surgical incisions for optimal healing but do not specifically form at joint folds.

C. flexure lines:Flexure lines are dermal folds that occur at or near joints, such as the wrist, fingers, and elbows. They allow the skin to bend and stretch without tearing, forming permanent creases where the skin is tightly bound to underlying structures.

D. friction ridges:Friction ridges are the raised patterns on the fingers, palms, and soles that enhance grip. They are not associated with joint folds or skin creases.