Developmental Biology I Chapter 4

What is cell differentiation?

Cell differentiation is the process by which cells become ordered and specialized for specific functions.

What is morphogenesis?

Morphogenesis refers to the biological process that causes an organism to develop its shape.

What is juxtacrine signaling?

Juxtacrine signaling involves direct communication between adjacent cells through direct contact.

What is paracrine signaling?

Paracrine signaling involves cells releasing signaling proteins that affect nearby cells.

What role do cadherins play in cell adhesion?

Cadherins are proteins that mediate adhesion between cells and are critical for maintaining tissue structure.

What happens during the neuralation process?

During neuralation, cells in the embryo differentiate into neural tissue and form the neural tube.

What does the term 'competence' refer to in developmental biology?

Competence refers to a cell's ability to respond to specific signaling molecules during differentiation.

How does sonic hedgehog signaling affect limb development in birds?

Sonic hedgehog signaling induces different epidermal structures like feathers or scales depending on the type of tissue it interacts with.

What is the significance of the differential adhesion hypothesis?

The differential adhesion hypothesis explains how cells sort themselves based on the strength of their adhesive properties.

Explain the role of transcription factors in cell signaling.

Transcription factors can be activated by signaling pathways to regulate gene expression in response to external signals.

What is the relationship between cell signaling and cancer?

Unregulated cell signaling can lead to cancer by allowing cancer cells to migrate and metastasize throughout the body.

What is the role of fibroblast growth factor (Fgf) during embryonic development?

Fgf is involved in numerous processes including limb development, neural induction, and organizing the development of various tissues.

What is the Notch-Delta signaling pathway?

The Notch-Delta signaling pathway regulates cell differentiation through interactions between the Notch receptor and the Delta ligand.

How do cells communicate over long distances?

Cells can communicate over long distances through paracrine signaling, where signaling molecules diffuse through the environment to target cells.

What is the significance of the extracellular matrix (ECM) in cell adhesion?

The ECM provides structural and biochemical support to surrounding cells; it is crucial for cell adhesion and communication.

How do mutations in cadherins affect development?

Mutations in cadherins can disrupt cell adhesion, leading to developmental defects and failed processes such as gastrulation.

What experiment demonstrates the induction of lens tissue in Xenopus?

Transplanting optic vesicle tissue induces neighboring ectoderm to form lens tissue based on the position and signaling competence.

What is the role of morphogen gradients in developmental signaling?

Morphogen gradients help establish spatial patterns of cell differentiation by providing varying levels of signaling molecules.

What can be inferred from the experiment involving heart cell adhesion and separation?

Heart cells demonstrate distinct adhesion properties, influencing their segregation and organization in developmental processes.