Primitive Streak

The first morphological sign of gastrulation in amniotes

TLS Online TPP Program

#Id: 1551

#Unit 2. Cellular Organization

Kinesin-1  (similar to myosin II)

Head domain at the N-terminus of the heavy chain  

Stalk domain forms a long coiled-coil

Tail domain at C-terminus that attaches to cargo

TLS Online TPP Program

#Id: 1552

#Unit 2. Cellular Organization

Kinesin-5 forms tetramers, assembled in a bipolar configuration to interact with two antiparallel microtubules and move toward the (+) ends.

TLS Online TPP Program

#Id: 1553

#Unit 2. Cellular Organization

Kinesin-14 is a C-terminal kinesin & travel toward the microtubule minus end.

TLS Online TPP Program

#Id: 1554

#Unit 2. Cellular Organization

The dyneins are a family of minus end–directed microtubule motors.

TLS Online TPP Program

#Id: 7769

#Unit 2. Cellular Organization

Nuclear envelope

Double-membrane structure; the outer membrane is continuous with the endoplasmic reticulum and the two membranes are perforated by nuclear pore complexes

TLS Online TPP Program

#Id: 7770

#Unit 2. Cellular Organization

The inner nuclear membrane contains proteins that act as binding sites for chromosomes and for the nuclear lamina.