The approximate BOD value for raw sewage is
A. 2000-7000 milligrams per milliliter.
B. 500-800 grams per milliliter.
C. 0-50 kilograms per milliliter.
D. 300-400 milligrams per liter.
D. 300-400 milligrams per liter.
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During embryonic development, the second cavity that forms in the blastocyst becomes filled with amniotic fluid
Indicate whether the statement is true or false
Which of these is not part of a seed?
A. Seed coat B. Fruit C. Diploid cells D. Endosperm E. Embryo
Which of the following infectious diseases currently tops the list of bioterrorist threats?
A. anthrax B. the plague C. smallpox D. botulism E. cholera
Although all protein structures are unique, there are common structural building blocks that are referred to as regular secondary structures. Some proteins have ? helices, some have ? sheets, and still others have a combination of both
What makes it possible for proteins to have these common structural elements? (a) specific amino acid sequences (b) side-chain interactions (c) the hydrophobic-core interactions (d) hydrogen bonds along the protein backbone