About __________ percent of the 295,000 known
species of flowering plants coevolved with animal
pollinators.
a. 50
b. 60
c. 70
d. 80
e. 90
Answer: e
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True or False. Phylogenetic methods based on DNA sequences and data from the fossil record both show that the evolutionary link between birds and crocodiles runs through dinosaurs
A. true B. false
Which of the following mechanisms is NOT used to encourage the movement of water over gills?
a. cilia b. contraction of the diaphragm c. contraction of a muscular mantle d. a fish swimming with its mouth open e. contractions of body muscles
All of the following are true about endotoxins EXCEPT:
A. The lipid A moiety in the LPS is responsible for the toxicity of the endotoxins B. The main pathologic effects of endotoxins are fever, shock, hypotension, and thrombosis a.k.a septic shock C. They are released into the host's circulation following bacterial cell analysis D. They are heat-stable lipopolysaccharide (LPS) component of the outer membranes of gram-positive bacteria
A(n) ________ is a regulatory molecule that is secreted into the blood by an endocrine gland.
A. G protein B. antibody C. enzyme D. hormone E. neurotransmitter