What is calmodulin, and what role does it play in signal transduction? What will be an ideal response?
Calmodium is an important Ca+2 binding protein. When calcium gates open in the plasma membrane
or the cytoplasm, the Ca+2 concentration rises in the cytosol. When calcium ions bind to a calmodium
molecule, the molecule changes shape and activates certain enzymes including protein kinases and
phosphatases
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Habitats with the most species in greatest danger of extinction are called ____
a. ecoregions b. island habitats
c. riparian zones d. hot spots e. conservation islands
The regulation of body temperature exclusively from the external environment is referred to as
A) endothermy. B) ectothermy. C) homeothermy. D) heterothermy.
Coniferous forests are important ecosystems, particularly in higher latitudes and altitudes. How are conifers of direct
economic importance to humans? What will be an ideal response?
The diploid number for the tomato, a eudicot, is 24. One of its pollen grains has ________ chromosomes, and the nutritive tissue of the seed has ________ chromosomes
A) 12… 12 B) 12… 24 C) 24… 24 D) 24… 36