1. Which of the following statements about the cytoskeleton is true?
A) All actin, microtubules, and intermediate filaments are present in the
B) The cytoskeleton provides a rigid and unchangeable structure important
for the shape of the
Nutrient content may be negatively affected
Allergen or toxin may be introduced
GM crops will be used to the exclusion of other varieties, reducing
biodiversity which may reduce ability to adapt to new conditions,
diseases, or other
Carcinogens from cooking meats
Polycyclic aromatic hydrocarbons (PAHs): formed when fat drips on a grill
and burns then rise with smoke and deposited on food surface
Limit: use lower-fat meat and a layer of aluminum foil to prevent fat
Technology for Keeping Food Safe
Food spoils when its taste, texture, or nutritional value is changed by
natural food enzymes or by microbes that grow on food
Techniques that preserve food work by destroying enzymes present in the
food, by killing microbe
What is pasteurization?
How does irradiation help extend the shelf life of food?
How does modified atmosphere packaging prevent food spoilage?
Why are food additives regulated?
THINK about this then share within a PAIR then SHARE with the class
What do yo
Regulation of food additives
Can be added only at levels 100 times below highest level shown to have
no harmful effects
Delaney Clause: states that a substance that induces cancer in either an
animal species or humans, at any dosage, may not be added to f
Modified atmosphere packaging (MAP)
Preservation technique to prolong shelf life of processed or fresh food by
changing the gases surrounding food in the package
Uses packaging materials impermeable to gases
Air in package is vacuumed out to remove oxygen
Where does the DNA introduced into GM plants come from?
How does biotechnology increase crop yields?
Why might a GM food cause an allergic reaction when the unmodified food
What types of GM foods carry special labels?
What is happening in this p
Food irradiation (cold pasteurization)
Food additive: produces compounds not present in the original foods
Opponents claim: introduces carcinogens and allows sale of
Irradiated food is not ra
Bovine somatotropin (bST)
Has created public concern
Produced naturally by cows and stimulates milk production
Genetically-engineered synthetic hormone is produced by bacteria and
injected into cows to further increase milk production
Milk from cows that