Diffusion of nonpolar molecules would not be affected by:
a. molecule size
b. steepness of the concentration gradient
c. temperature
d. charge
e. steepness of the pressure gradient
d
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The hemocyanin of arthropods and molluscs differs from the hemoglobin of mammals in that _____
A) the oxygen dissociation curve for hemocyanin is linear B) hemocyanin carries appreciably more carbon dioxide C) hemocyanin has protein coupled to copper rather than to iron D) the protein of hemocyanin is not bound to metal E) hemocyanin includes cyanic acid
Algae and cyanobacteria are examples of primary producers
____________________ Indicate whether the statement is true or false.
The subatomic particles that are found in the nucleus of an atom are the
a. protons and electrons. b. neutrons and protons. c. electrons only. d. protons only. e. electrons and neutrons.
The carotenoid pigments of some phototrophs interact with ________ to reduce its toxicity
A) singlet oxygen (1O2) B) hydroxyl radical (HO-) C) peroxide anion (O22-) D) superoxide radical (O2-) E) molecular oxygen (O2)