DNA replication always proceeds by adding new bases to the ________ end of an existing strand.
A. 2'
B. 3'
C. 4'
D. 5'
E. 1'
Answer: B
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The secondary lymphoid organs consist of the following EXCEPT
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If the NaCl concentration drops below 1.5 M the cell walls of Halobacterium become more rigid.
Answer the following statement true (T) or false (F)
The half-life of Carbon-14 is approximately 5,700 years. Using this information scientists have been able to determine the age of some artifacts left by humans. A scientist wants to know approximately how old a piece of wood was that she found on the floor in an old cave that had recently been discovered. She removed the wood (with permission) to her laboratory. Her wood sample contained 2 grams
of Carbon- 14. If the age of the wood was determined to be 22,800 years old, how much Carbon-14 originally existed in this piece of wood? A. 32 grams B. 16 grams C. 12 grams D. 8 grams E. 4 grams
Which of the following is the conversion of ammonium ion+ into nitrogen gas (N2)?
A) assimilation B) anammox C) nitrogen fixation D) nitrification E) denitrification