What type of signal often advertises the presence of an animal or group of animals?
a. chemical
b. pheromone
c. visual
d. acoustical
e. tactile
d
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Membrane proteins are not very soluble in water, because they possess long stretches of non-polar amino acids that are
A. too long to interact with the water molecules. B. hydrophobic. C. are transmembranal. D. hydrophilic. E. used as transport channels.
Some herbivores are known as _______, feeding on a wide variety of plant species
A. specialists B. omnivores C. generalists D. autotrophs E. carnivores
A substance formed by some pathogens that impairs and sometimes lyses leukocytes is known as a leukocidin
a. true b. false
Plants transport water to their leaves through the xylem when water evaporates from the leaves. The evaporating water pulls other water molecules up the xylem through ________.
A. Ionic bonds B. Hydrophobic interactions C. Covalent bonds D. Hydrogen bonds