List the steps involved in the formation of a blood clot.
What will be an ideal response?
When a blood vessel is punctured
1. Platelets will congregate and form a plug.
2. Platelets and damaged tissue release prothrombin activator, which initiates a cascade of enzymatic reactions.
3. Prothrombin activator converts prothrombin into thrombin.
4. Thrombin severs two amino acid chains from fibrinogen.
5. The activated fragments form the fibrin thread.
6. Fibrin winds around the platelet plug providing a framework for the clot.
7. Blood vessel repair starts; plasmin destroys the fibrin network so new cells can grow.
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The most diverse eukaryotic superkingdom is:
A. Archaeplastida. B. Alveolata. C. Opisthokonta. D. Amoebozoa.
Describe reproduction in the sea star.
What will be an ideal response?
Active transport must function continuously because _______.
a) cells must be in constant motion b) facilitated transport opposes active transport c) diffusion is constantly moving the solutes in the other direction d) plasma membranes wear out
Mitotic cell division functions in all of the following except to _____.
A) increase body size through growth B) replace worn-out or dead cells C) repair injured tissues D) produce gametes or spores