Members of the Ecdysozoa are characterized by having a cuticle
____________________ Indicate whether the statement is true or false.
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Why are some mutations of Ras associated with cancer?
A. Ras binds to growth factor receptors. B. Ras is a type of G protein. C. Ras is part of the MAP kinase signal transduction pathway. D. Ras alters gene expression.
Which of the following is true of the actinomycetes?
A. Some are photosynthetic. B. They closely resemble the fungi in morphology. C. They divide by budding. D. They are unique among prokaryotes in producing sexual spores.
Why have scientists developed classification systems?
a. To arrange living and dead organisms into groups reflecting their relationships and evolutionary origins. b. To make sense of the past and present diversity of life on Earth. c. To help scientists distinguish two different groups of organisms with the same common name. d. To arrange living and dead organisms into groups that reflect their relationships and evolutionary origins and to make sense of the past and present diversity of life on Earth. e. To arrange living and dead organisms into groups that reflect their relationships and evolutionary origins, to make sense of the past and present diversity of life on Earth, and to help scientists distinguish two different groups of organisms with the same common name.
The movement of molecules across a membrane from an area of lower concentration to an area of higher concentration with the expenditure of energy is called ________.
A. facilitated diffusion B. active transport C. osmosis D. passive diffusion