If you live on a river delta or coastline, you may not be able to eat the local clams because of high levels of toxins present in the water. Why?

A) Clams seasonally produce toxic substances.
B) Clams regularly consume poisonous red tide organisms.
C) Most native clams have been replaced by harmful exotic species.
D) Clams are filter-feeders and pollutants in the water become concentrated in their tissues.
E) The toxins contained in clams cannot be detoxified in the human digestive tract.

Only organisms with chloroplasts are capable of photosynthesis.

Suppose the free energy of the reactants is greater than the free energy of the products. Such a reaction is referred to as a(n) ____.

A) entropic reaction
B) endergonic reaction
C) exergonic reaction
D) catabolic reaction
E) activation reaction

Asomycetes are NOT used for which of the following applications?

A) Flavor cheese
B) Bake bread
C) Prepare vinegar
D) Produce antibiotics
E) Biological research

Which arthropods have mandibles, gills, excretory glands, and statocysts?

A) mites
B) insects
C) spiders
D) scorpions
E) crustaceans

An action potential includes

A) depolarization only.
B) repolarization only.
C) depolarization and repolarization.
D) resting potential and depolarization.
E) resting potential and repolarization.

Primary growth of a stem is due to the activity of the vascular cambium.

Why is epithelial tissue more likely to become cancerous?