At the same time that Cdc25C is being activated, mitotic CDKs and Plk1 phosphorylate Wee1, which targets it for destruction through a phosphobinding SCF protein-ubiquitin ligase. This forms positive feedback loop 2

TLS Online TPP Program

#Id: 9731

#Unit 6. System Physiology – Plant

The specialist caterpillars of the monarch butterfly

(Danaus plexippus) are insensitive to the terpenoid toxins. They feed on milkweed leaves and retain the cardenolides. As a result, most insectivorous birds quickly learn to avoid eating monarch caterpillars and adult monarch butterflies.

TLS Online TPP Program

#Id: 9732

#Unit 6. System Physiology – Plant

One plant produced sesquiterpene, (E)‐β‐farnesene (EBF), has been considered a potential defense against aphids, since its emission by plants causes aphids to drop off the plant or depart from the feeding site. 

TLS Online TPP Program

#Id: 9733

#Unit 6. System Physiology – Plant

For many aphids, EBF is the principal constituent of the aphid alarm pheromone, and the constitutive production of EBF by plants could hold promise in the control of specific aphid pests

TLS Online TPP Program

#Id: 9734

#Unit 6. System Physiology – Plant

To store, toxic secondary metabolites is to conjugate them with a sugar, which also makes them more water soluble

TLS Online TPP Program

#Id: 9735

#Unit 6. System Physiology – Plant

Members of the Brassicales produce glucosinolates—sulfur-containing organic compounds derived from glucose and an amino acid—as their major defensive secondary metabolites

TLS Online TPP Program

#Id: 9736

#Unit 6. System Physiology – Plant

The hydrolyzing enzyme, myrosinase (a thioglucosidase), is stored in different cells than its substrates. While myrosinase-containing cells are mostly glucosinolate-free, the so-called sulfur-rich cells (or S-cells) contain high concentrations of glucosinolates.