The circulatory system in plants is composed of
1) Transportation and transpiration
2) Heart and blood
3) Xylem and phloem
4) None of the above
Xylem and phloem
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Shells of forams consist of organic matter reinforced by
a. silica. b. cellulose. c. calcium carbonate. d. copper sulfate. e. hydrogen sulfide.
What may result if a mutation occurs in a gene?
A) There may be no effect on the protein encoded by the gene. B) A nonfunctional protein may be created. C) A protein with a new function will not be formed. D) The phenotype of the organism may be changed.
In an F+ × F? conjugation, the donor is the ________ strain.
A. F? B. neither F+ nor F? (there is no exchange) C. F+ D. both F+ and F? (it is a reciprocal exchange)
What allowed multicellular eukaryotic cells to generate multiple, interacting cell types during development?
A. a dynamic cytoskeleton B. membrane systems C. gene regulation D. the ability to perform photosynthesis