Amoebae are characterized by:
A. locomotion by extension of pseudopodia
B. possession of hard shells
C. tertiary symbiosis
D. causing cancer
E. conjugation
A. locomotion by extension of pseudopodia
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True or False: some ions that facilitate enzymatically catalyzed reactions are capable of catalyzing reactions independently of an enzyme
A. true B. false
Many polar-dwelling fishes have "antifreeze proteins" that prevent their bodies from freezing solid
even at very low temperatures. Briefly describe how these proteins function.
What will be an ideal response?Xylem transports water and dissolved nutrient minerals in which direction?
a. upward b. downward c. inward laterally d. outward laterally e. both upward and downward
Why can't amphibians be entirely terrestrial?
A) Their limbs are not adapted to support their bodies on land. B) They have a three-chambered heart that is not efficient enough for terrestrial life. C) Their digestion is adapted for consuming aquatic prey. D) Their reproduction requires water to allow fertilization and keep eggs moist. E) They do not have lungs but instead have gills that require water for gas exchange.