A cluster of tumor cells that produces and secretes growth factors to induce surrounding cells to grow and divide is showing which type of cell-to-cell signaling?
A) autocrine
B) paracrine
C) endocrine
D) neuroendocrine
B
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All of the petals of a flower are collectively called the
(a) corolla. (b) stamens. (c) receptacles. (d) calyx.
Answer the following statements true (T) or false (F)
1. The root hairs develop in the zone of elongation. 2. The direction in which a plant cell expands depends on the arrangement of cellulose microfibrils in its cell wall. 3. Flowers develop as a result of determinate shoot growth. 4. The expression "one bad apple spoils the whole bunch" probably has to do with the action of ethylene on fruit ripening.
The skeleton nicknamed Lucy is:
a. Homo habilis. b. Australopithecus afarensis. c. Australopithecus africanus. d. Ardipithecus ramidus. e. Homo erectus.
What tissue conducts water and dissolved minerals from the roots to the stems and leaves?
a. collenchyma b. epidermis c. periderm d. xylem e. phloem