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

Biology & Microbiology

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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

Biology & Microbiology

The adhesion step in extravasation is most likely to be mediated by:

A. integrin proteins. B. cell wall proteins. C. collagen. D. keratin.

Biology & Microbiology

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

Biology & Microbiology

In _____ gas exchange occurs at the body surface and gas is distributed by diffusion alone

a. earthworms c. frogs b. flatworms d. insects

Biology & Microbiology