Bacteria have two links between replication and cell growth:

• The frequency of initiation of cycles of replication is adjusted to fit the rate at which the cell is growing. 

• The completion of a replication cycle is connected with division of the cell.

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#Id: 1180

#Unit 7. System Physiology – Animal

The photosensitive pigment in the rods is called rhodopsin (visual purple).

TLS Online TPP Program

#Id: 1181

#Unit 7. System Physiology – Animal

Rhodopsin is comprised of: 

  Retinal (an aldehyde of vitamin A)

  Opsin protein (GPCR)

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#Id: 1182

#Unit 7. System Physiology – Animal

Retinal is parallel to the surface of the membrane and is attached to a lysine residue at position 296 in the seventh transmembrane domain.

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#Id: 1183

#Unit 7. System Physiology – Animal

Neurotransmitter release from the rods of retina- Glutamate

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#Id: 1184

#Unit 7. System Physiology – Animal

When light strikes the outer segment of Rod cells: 

Na + channels closed 

Hyperpolarizing receptor potential

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#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