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

TLS Online TPP Program

#Id: 969

#Unit 5. Developmental Biology

Twin and Siamois encode homeodomain transcription factors and are expressed in the organizer

TLS Online TPP Program

#Id: 7572

#Unit 5. Developmental Biology

Translocation of sperm from the vagina to the oviduct involves several processes that work at different times and places:

Sperm motility

Uterine muscle contractions

Sperm rheotaxis

TLS Online TPP Program

#Id: 745

#Unit 3. Fundamental Processes

Additional free energy for the formation of phosphodiester bond is provided by the rapid hydrolysis of the pyrophosphate into two phosphate groups by an enzyme known as pyrophosphatase:

 

TLS Online TPP Program

#Id: 1047

#Unit 5. Developmental Biology

The cells found within the most posterior region of the progress zone constitute the zone of polarizing activity.

TLS Online TPP Program

#Id: 554

#Unit 2. Cellular Organization

Vegetative cells begin sporulation when a key nutrient- carbon or nitrogen source becomes scarce.