How do calcitonin and parathyroid hormone interact to regulate blood calcium levels?
What will be an ideal response?
They act as antagonists. Calcitonin lowers the level of blood calcium by inhibiting its release from the bones. Parathyroid hormone raises the level of blood calcium by releasing it from the bones.
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The distinctive feature of chloroplasts is that they contain a green pigment called:
A. Gram stain. B. chlorophyll. C. hemoglobin. D. chromatin. E. keratin.
Every cell within one organism has the same genome. In what way(s) can these cells differ from each other?
_____ number of chromosomes _____ ratio of organelles _____ proteins produced _____ number of genes in the DNA _____ surface area of cell membrane
In plant cells, what provides cellular support and protects cells from pathogens?
a. the cell wall b. the cell membrane c. the cytoplasm d. the plasmodesmata
In general, minerals in plant foods have an absorption rate that is _______ than that in animal foods.
a) higher b) the same c) lower