Which one of the following is required in the diet in order for active thyroid hormones to be produced?
A) calcium
B) phosphorus
C) iodine
D) zinc
E) iron
C
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In his book Principles of Geology, Lyell argued that:
What will be an ideal response?
Blood is surveyed for foreign material in the spleen.
Answer the following statement true (T) or false (F)
Yaws is a serious skin disease of children in tropical countries, caused by Treponema pertenue, a species closely related to the bacteria that cause syphilis. Individual cells of T. pertenue are helical, relatively long, and flexible like the one pictured below. These cells are known as _____.
Fill in the blank(s) with the appropriate word(s).
Escherichia coli and Clostridium acetobutylicum are reported to be derived from a common ancestor. They have some similar, but not identical gene sequences. What is the best explanation for this difference in genetic coding?
A. The two species never diverged, but were discovered by two different scientists and given different names. B. The two species are not closely related, but E. coli passed the similar gene sequences to C. acetobutylicum via horizontal gene transfer. C. After the two species diverged, the similar gene sequences evolved through convergent evolution. D. After the two species diverged, the genes accumulated random mutations that resulted in similar, but not identical gene sequences.