Explain the steps involved in the clotting process
What will be an ideal response?
First, the injured vessel constricts. Next, the platelets form a plug to seal the leak. Then the injured tissue and platelets release clotting factors. Clotting factors convert an inactive blood protein to prothrombin activator, which in turn converts prothrombin to thrombin. Then thrombin converts fibrinogen to fibrin. In the last step, the fibrin fibers form a network to trap red blood cells and platelets, causing a clot to form.
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There are many examples of unusual plants, such as the pitcher plant that you have studied in
Chapter 13. Another highly unique plant is the Hydnora africana, which is indigenous to deserts in southern Africa. The only portion of this plant that is visible above ground is a fairly large fleshy orange and brown flower. There are no leaves or stems evident, but it has an extensive root system that intertwines with the roots of another type of plant. Explain the unusual lifestyle of this species. In addition, name a macronutrient that would not be needed by this plant as much as it would in a traditional plant.
What will be an ideal response?All cancers reflect, at the most general level, a defect in
A) DNA replication. B) the formation of mitochondria. C) cell membrane structure. D) the cell cycle.
Science is based on
a. faith. b. authority. c. evidence. d. force. e. opinion.
The role of environmental factors on gene expression
is illustrated by a. the varying plant height of genetically identical yarrow plants when grown at different elevations. b. varying body forms of Daphnia affected by the presence of predators c. the depression response that some persons make to very stressful situations. d. the fur pattern of Himalayan rabbits. e. all of these.