Respiration and Growth Flashcards
What are the three main chemical and functional classes of hormones that regulate the insect endocrine system?
- Neuropeptide and neuroprotein hormones
- Ecdysteroids
- Juvenile hormones
Why is use of the natural juvenile hormone as a selective insecticide not feasible?
- It is difficult to synthesize
-It has environmental instability
What happens to apolysis and ecdysis when exposed to acylureas?
When exposed to acylureas, apolysis is normal, but ecdysis is disrupted.
What is the mode of action of diflubenzuron?
Alters cuticle composition.
What is necessary for a virus to infect insect hosts?
Ingestion
Three factors that can reduce the effectiveness of microbials?
- Heat
- UV Light
- Dessication
What happens once the activated Cry toxin attaches to the appropriate receptor sites?
It paralyzes and destroys the cells of the insect’s gut wall, eventually leading to cessation of feeding.
Viability of fungal spores is greatly affected by what?
Environmental conditions
The first step in the toxic action of Cry proteins is _________
Toxin ingestion
because the Cry protein is a prototoxin and must be altered to become a toxin, it undergoes _________________
Solubilization by the alkaline gut
After proteolytic activation . The next step involves the activated toxin binding to a receptor. The toxin then inserts into the membrane, leading to ______
Pore formation, which causes cell lysis and mortality.
Define Antagonist
Biological activity from interaction of two chemicals is less than would be expected if the chemicals were applied individually
Define Synergist
One chemical increases the biological activity of another
Define Agonist
Biological activity from interaction of two chemicals is additive
