Neutral selection (Ka/Ks = 1)

Positive selection (Ka/Ks > 1)

Purifying selection (Ka/Ks < 1)

TLS Online TPP Program

#Id: 8103

#Unit 1. Molecules and their Interaction Relevant to Biology

Phosphatidylglycerol, cardiolipin, and phosphatidylinositols all are anionic phospholipids

TLS Online TPP Program

#Id: 8104

#Unit 1. Molecules and their Interaction Relevant to Biology

The venoms of poisonous snakes contain (among other things) a class of enzymes known as phospholipases, enzymes that cause the breakdown of phospholipids

TLS Online TPP Program

#Id: 8105

#Unit 1. Molecules and their Interaction Relevant to Biology

Three glycolipids of chloroplast thylakoid membranes.

TLS Online TPP Program

#Id: 8106

#Unit 1. Molecules and their Interaction Relevant to Biology

Galactolipids are localized in the thylakoid membranes (internal membranes) of chloroplasts; they make up 70% to 80% of the total membrane lipids of a vascular plant, and are therefore probably the most abundant membrane lipids in the biosphere. 

TLS Online TPP Program

#Id: 8107

#Unit 1. Molecules and their Interaction Relevant to Biology

Phosphate is often the limiting plant nutrient in soil, and perhaps the evolutionary pressure to conserve phosphate for more critical roles favored plants that made phosphate-free lipids.

TLS Online TPP Program

#Id: 8108

#Unit 1. Molecules and their Interaction Relevant to Biology

A typical membrane lipid of archaea.

Diphytanyl moieties are 8 five-carbon isoprene groups condensed end-to-end.