The tailbone of humans is an example of a(n) ____
a. developing feature
b. accidental feature
c. vestigial feature
d. great chain of being
e. fossil structure
ANSWER: c
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The loss of CD4 T-helper cells leads to the overt consequences of an HIV infection
Indicate whether the statement is true or false.
Secondary structure is characterized by which one of the following types of interactions?
A. hydrogen bonding within the peptide backbone B. a covalent bond between two cysteines C. ionic bonding between an acidic side chain and a basic side chain D. hydrogen bonding between side chains of amino acids E. the covalent bond between an amino nitrogen and a carboxyl carbon
Which trait is not found in all chordates?
a. a dorsal nerve cord b. a postanal tail c. an internal backbone d. a notochord
Which one of the following correctly describes the order of stem cells from the lowest degree of flexibility to the highest degree of flexibility?
A) multipotent < unipotent < pluripotent < totipotent B) unipotent < multipotent < totipotent < pluripotent C) unipotent < multipotent < pluripotent < totipotent D) pluripotent < unipotent < totipotent < multipotent