In 1909, Charles Walcott discovered fossils in the Burgess Shale of the Canadian Rockies. The area was formed by an underwater mudslide that provided an oxygen free environment, so decomposition was minimal. Why were these fossils so unique?
A. They were from the Cambrian period.
B. There were both vertebrate and invertebrate (soft bodied) animals fossilized.
C. Only invertebrate (soft bodied) animals were found and no vertebrate animals or plants.
D. Before this discovery, it was thought that mudslides could not occur underwater.
E. The first bird fossil, Archaeopteryx, was discovered in this area.
B. There were both vertebrate and invertebrate (soft bodied) animals fossilized.
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Phototrophic purple bacteria such as Rhodobacter species grow ONLY by photosynthesis, using bacteriochlorophylls to harvest light
Indicate whether the statement is true or false.
If a hormone caused an increase in protein kinase activity, predict the type of hormone responsible and
the intracellular signaling mechanism of its action.
What will be an ideal response?ATP is required by cells for
A. DNA replication. B. movement. C. production of proteins. D. growth. E. All of the answer choices are correct.
What are the benefits, real and potential, of
adult cell cloning?
a. the timing of the production of offspring can be controlled b. cloned animals will be consistently the same as their donor c. cloned cells can be used to study the processes of cell differentiation d. cloned cells can be used to study the process of diseases and thus potentially lead to cures e. all of these are benefits of adult cell cloning