________ are insoluble polymers of aromatic alcohols that are primarily found in woody tissues.
Fill in the blank(s) with the appropriate word(s).
Lignins
Biology & Microbiology
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Which of these is an agent that is used to sterilize the plastic tubing of heart-lung machines?
A. Phenol B. Ethylene oxide C. Mercaptoethanol D. 70% ethanol
Biology & Microbiology
The placenta
A) is where blood cells form before the fetus has bone marrow. B) nourishes the fetus and secretes hormones that maintain the pregnancy. C) is a membrane surrounding the embryo that gives rise to the blood vessels in the umbilical cord. D) is the membrane that contains the fetus.
Biology & Microbiology
Peter and Rosemary Grant are known for their work on
A) Tenebrionid beetles. B) marine iguanas. C) Galápagos tortoises. D) Darwin's finches.
Biology & Microbiology
Hemicellulose is more (less) soluble than cellulose. Indicate whether the statement is true or false
Biology & Microbiology