Squalene, spiral valve, electroreceptors, lateral-line system, and claspers are all adaptations associated
with living members of which lineage?
a. Petromyzontoidea
b. Chondrichthyes
c. Actinopterygii
d. Myxinoidea
e. Sarcopterygii
B
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In the 1700s, Swedish scientist Carl Linnaeus developed the first comprehensive system for classifying living things. His system included two kingdoms—animal and plant. In the 1860s, scientists expanded this classification system to three kingdoms. The new kingdom included all single-celled organisms. What name did they give this third kingdom?
A) Plantae B) Bacteria C) Animalia D) Protista
Proteins must have more than one _______ to have a quaternary structure.
a. alpha helix b. beta pleated sheet c. polypeptide chain d. transmembrane segment
Multiple functional groups are able to attach to macromolecules. What is the most useful characteristic that enables the attachment of multiple functional groups?
A. four carbon covalent bonds B. one hydrogen ionic bond C. three nitrogen ionic bonds D. two oxygen covalent bonds
Which of the following organs have cells that can be infected by Chlamydia trachomatis?
A. eyes B. trachea C. rectum D. urethra E. eyes, trachea, rectum, and urethra.