The target cell concept is illustrated in the picture. Label the cells as either target cells or non-target cells by identifying A and B as such. Explain your answer.
What will be an ideal response?
A is a nontarget cell and B points to target cells. The target cells have surface receptors for the hormone molecules that will combine with the receptors as a key fits a lock. Once bound to the receptor, internal changes in the cell occur or the hormone may pass directly through the plasma membrane. Nontarget cells do not have the specific plasma membrane receptors that will combine with the hormone.
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Which of the following is/are secondary lymphoid organ(s)?
A. Thymus B. Spleen C. Lymph nodes D. Bone marrow E. Spleen AND lymph nodes
Members of the phylum ____ exhibit radial symmetry, with their body parts arranged regularly around a central axis
a. Porifera b. Mollusca c. Cnidaria d. Platyhelminthes e. Chordata
The secondary plant cell walls contain large amounts of lignin, which is a polymer of amino acids. Indicate whether the statement is true or false
Charles Darwin called choosing a mate based on its color or some other characteristic:a
sexual selection. b. gamete selection. c. sexual orientation. d. gametic preference. e. postzygotic selection