The phospholipids of plasma membranes have
a. a hydrophobic head and a hydrophilic tail.
b. a hydrophobic head and a hydrophobic tail.
c. a hydrophobic head and two hydrophobic
tails.
d. a hydrophilic head and two hydrophobic
tails.
e. a hydrophilic head and two hydrophilic
tails.
D
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Answer the following statement true (T) or false (F)
When molecules are referred to as D- or L- (for example D-forms of sugars and L-forms of amino acids), the D- and Ldesignations
refer to the specific ____.
a. functional group b. structural isomer c. covalent bond d. secondary structure e. stereoisomer
A recently-developed mnemonic for remembering the taxonomic levels from Domain to Species is "Dumb Kids Prefer Candy Over Fancy Green Salad." The word "candy" here is a reminder of the taxonomic level of ________.
A. chain B. class C. colony D. culture E. category
Which cancer-causing agent inserts foreign DNA into cells making them cancerous?
a. parasites b. viruses c. mast cells d. radiation e. bacteria