Most microtubules in a cell consist of a simple tube, a singlet microtubule, built from 13 protofilaments. 

TLS Online TPP Program

#Id: 10218

#Unit 6. System Physiology – Plant

KNOX transcription factors activate the cytokinin biosynthetic gene ISOPENTENYL TRANSFERASE7 -IPT7

TLS Online TPP Program

#Id: 9286

#Unit 6. System Physiology – Plant

Plant glutamine synthetase (GS) and NADH‐dependent glutamate synthase (NADH‐GOGAT) are responsible for the initial massimilation of ammonia into organic compounds

TLS Online TPP Program

#Id: 954

#Unit 5. Developmental Biology

When sulfated polysaccharide binds to its receptor on the sperm, activates 3 sperm membrane proteins: 

(1) A calcium transport channel

(2) A sodium-hydrogen exchanger

(3) A phospholipase enzyme (IP3)

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#Id: 2399

#Unit 3. Fundamental Processes

There are two classes of snoRNPs involved in rRNA processing in nucleolus. 

The box H/ACA snoRNPs are involved in pseudouridylylation, and box C/D snoRNPs function in 2-O-methylations.

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#Id: 8175

#Unit 2. Cellular Organization

SNARE-mediated fusion occurs during exocytosis of secreted proteins. In this case, 

v-SNARE, are VAMP 

t-SNAREs are syntaxin & SNAP-25