Humans are responsible for more than 75 percent of all present-day extinctions since A.D. 1600
Indicate whether the statement is true or false
TRUE
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Biological membranes are held together mainly by
a. hydrogen bonds between lipid molecules. b. hydration layers over lipid molecules. c. exclusion of the nonpolar regions of lipids by water. d. hydrogen bonds between water molecules. e. surface tension at the interface between layers of water molecules.
Mature bone cells in lacunae that no longer divide. Maintain bone matrix and act as stress or strain sensors. Respond to mechanical stimuli such as increased force on bone or weightlessness. Communicate information to osteoblasts and osteoclasts (cells that destroy bone) so bone remodeling can occur.
What will be an ideal response?
DNA or protein can be used as a "molecular clock" that tells how long it has been since two species have diverged from a common ancestor.
Answer the following statement true (T) or false (F)
One of the following enzymes found in some bacteria which can break down toxic hydrogen peroxide into water and oxygen is
a) superoxide dismutase. b) peroxidase. c) hydroxylase. d) catalase.