Myosins have 

  Motor head domain

  Lever-arm neck domain

  Cargo-binding tail domain

TLS Online TPP Program

#Id: 5457

#Unit 7. System Physiology – Animal

The number of Na + channels per square micrometer of membrane in myelinated mammalian neurons has been estimated: 

50–75 in the cell body, 350–500 in initial segment, less than 25 on the surface of the myelin, 2000–12,000 at the nodes of Ranvier & 20–75 at the axon terminals 

TLS Online TPP Program

#Id: 3683

#Unit 2. Cellular Organization

There are 6000 genes in yeast; 21,700 in a nematode worm; 17,000 in a fly; 25,000 in the small plant Arabidopsis; and probably 20,000 to 25,000 in mice and humans

TLS Online TPP Program

#Id: 1670

#Unit 4. Cell Communication and Cell Signaling

Inactivated or “Killed” Vaccines This kills the pathogen, making it incapable of replication

TLS Online TPP Program

#Id: 5461

#Unit 7. System Physiology – Animal

Lioyd and Hunt, applies only to sensory nerve fibers and uses a Roman numeral nomenclature of I, II, III, and IV

TLS Online TPP Program

#Id: 7836

#Unit 1. Molecules and their Interaction Relevant to Biology

A carbon atom with four different substituents is said to be asymmetric, and asymmetric carbons are called chiral centers

Chiral carbon most distant from the carbonyl carbon has the same configuration as the chiral carbon in D-glyceraldehyde.