The cI gene is transcribed from PRE when establishing lysogeny and from PRM when maintaining that state. 

PR controls not only lytic genes, but also expression of cII and is thus important in lysogeny as well as lytic development. PL which controls many lytic genes, also controls the cIII gene which helps establish lysogeny

TLS Online TPP Program

#Id: 1184

#Unit 7. System Physiology – Animal

When light strikes the outer segment of Rod cells: 

Na + channels closed 

Hyperpolarizing receptor potential

TLS Online TPP Program

#Id: 1185

#Unit 7. System Physiology – Animal

The hyperpolarization of rod cells:

  Reduces the release of glutamate

  Generates a signal in the bipolar cells

  Leads to AP in ganglion cells 

TLS Online TPP Program

#Id: 1186

#Unit 7. System Physiology – Animal

Retinal ganglion cells contain melanopsin.

TLS Online TPP Program

#Id: 1187

#Unit 7. System Physiology – Animal

Types of retinal ganglion cells:

  large ganglion cells (magno, or M cells)

  small ganglion cells (parvo, or P cells)

TLS Online TPP Program

#Id: 1188

#Unit 7. System Physiology – Animal

A lesion that interrupts one optic nerve causes blindness in that eye.

TLS Online TPP Program

#Id: 1189

#Unit 7. System Physiology – Animal

Homonymous (same side of both visual fields) Hemianopia (half blindness)