A hypothesis about the evolutionary relatedness of a group of organisms is known as a:
A) homology. B) phylogeny. C) analogy. D) taxon.
Answer: B
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The Stramenopila are a very large and diverse group that all possess ________ at some point in their life cycle.
A. chloroplasts B. a macronucleus C. an exoskeleton D. heterokont flagella
The adhesion step in extravasation is most likely to be mediated by:
A. integrin proteins. B. cell wall proteins. C. collagen. D. keratin.
Which of the following is the correct order for the synthesis of the plant cell wall, from the outermost layer to the innermost layer?
A) middle lamella; primary cell wall; secondary cell wall; plasma membrane B) primary cell wall; middle lamella; secondary cell wall; plasma membrane C) plasma membrane; secondary cell wall; primary cell wall; middle lamella D) middle lamella; secondary cell wall; primary cell wall; middle lamella E) primary cell wall; secondary cell wall; plasma membrane; middle lamella
In _____ gas exchange occurs at the body surface and gas is distributed by diffusion alone
a. earthworms c. frogs b. flatworms d. insects