Many plants contain mixtures of volatile monoterpenes and sesquiterpenes, called essential oils examples- Peppermint, lemon, basil, and sage 

Chief monoterpene constituent of peppermint oil is menthol; that of lemon oil is limonene

TLS Online TPP Program

#Id: 10063

#XL - T Zoology

CAMs fall into one of four major families: 

Cadherins

Immunoglobulin (Ig) superfamily

Integrins

Selectins

TLS Online TPP Program

#Id: 10064

#XL - T Zoology

The adhesiveness of cadherins depends on the presence of extracellular Ca2+

TLS Online TPP Program

#Id: 10065

#XL - T Zoology

Two type of Cadherins:

1. Classical cadherin proteins

2. Nonclassical cadherin proteins

TLS Online TPP Program

#Id: 10066

#XL - T Zoology

Extracellular region of a classical cadherin contains five copies of the cadherin domain separated by flexible hinge regions

TLS Online TPP Program

#Id: 10067

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Ca2+ ions bind to sites near each hinge and prevent it

from flexing, so that the whole string of cadherin domains behaves as a rigid and slightly curved rod to generate cell–cell adhesion

TLS Online TPP Program

#Id: 10069

#XL - T Zoology

Each classical cadherin molecule contains: 

A single TM domain

A short C-terminal cytosolic domain

Five extracellular “cadherin” domains (EC1–EC5)