Lipids act as _________ ______ within organisms; example: cell membrane is made up of lipids. fats
Fill in the blank(s) with the appropriate word(s).
structural units
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Adaptive radiation is best described as the
A. existence of groups of closely related species recently evolved from a common ancestor. B. existence of groups of distantly related species recently evolved from a common ancestor. C. existence of groups of closely related species recently evolved from different ancestors through hybridization. D. existence of individuals of closely related species that originated in different areas within diverse habitats, but that have rejoined as a single species.
The absence of which of the following pigments
prevents a plant from responding to the duration of light and darkness? a. chlorophyll b. xanthophyll c. carotene d. phytochrome e. flavoproteins
Which of the following may possess primary, secondary, tertiary, and quaternary structures?
A) Nucleic acids B) Lipids C) Proteins D) Carbohydrates
Up to 70% of travel-associated gastrointestinal diseases are caused by
A) Salmonella B) Enterotoxigenic strains of E. coli C) Shigella dysenteriae D) E. coli O157:H7 E) Enteroinvasive E. coli