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

Biology & Microbiology

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All of the petals of a flower are collectively called the

(a) corolla. (b) stamens. (c) receptacles. (d) calyx.

Biology & Microbiology

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.

Biology & Microbiology

The skeleton nicknamed Lucy is:

a. Homo habilis. b. Australopithecus afarensis. c. Australopithecus africanus. d. Ardipithecus ramidus. e. Homo erectus.

Biology & Microbiology

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

Biology & Microbiology