If you went diving in a freshwater lake, you would see very few rooted aquatic plants after a certain depth. What limits plant growth in deeper water?
A. cold temperatures
B. a lack of nutrients
C. a lack of light
D. too many herbivores
E. a lack of oxygen
Answer: C. a lack of light
You might also like to view...
Compatible solutes counteract the tendency of a cell to become
A) buoyant in high ionic strength environments. B) hyperosmotic in low ionic strength environments. C) dehydrated in high ionic strength environments. D) viscous in low ionic strength environments.
Malarial parasites are able to evade the active immune response by
a. remaining inside the host cells throughout the whole infection, thereby avoiding exposure to antibodies in the bloodstream. b. secreting substances that block the binding and recognition of their protein by host B cells. c. changing their coat proteins so that the host antibodies in current production cannot bind to them. d. overwhelming the immune cells and antibodies by an enormous production of parasitic cells. e. interfering with the production of memory cells, so that subsequent infections are just as deadly as initial ones..
The oxygen transporting pigment found in the system depicted in the accompanying figure is most likely:a
hemoglobin. b. hemolymph. c. hemocyanin. d. globulin. e. erythropoietin
The discovery that ATP is a pain-signaling factor immediately suggested what possible therapeutic approach to alleviate chronic pain?
A. treat with an ATP receptor antagonist B. create large intracellular aggregates of ATP C. block the synthesis of ATP inside cells D. use electric stimulation on pain centers of the brain