The invertebrate group most closely related to the vertebrates is the
A. Notochordata.
B. Urochordata.
C. Ophiouroidea.
D. Cephalochordata.
E. Echinodermata.
Answer: B
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When antibodies bind antigens, the clumping of antigens results from _____
A) the antibody having at least two binding regions B) disulfide bridges between the antigens C) a complement that makes the affected cells sticky D) bonds between class I and class II MHC molecules E) denaturation of the antibodies
The “tunic” of tunicate refers to
a. a body covering. b. the type of food-gathering mechanism. c. muscle arrangements in the larva. d. the immature stage of a true fish. e. organ rotation during reorganization.
The midrange of an array of phenotypes is favored in
A. stabilizing selection. B. genetic drift. C. disruptive selection. D. gene flow. E. directional selection.
Prophages can be activated into viral replication and enter the lytic cycle.
Answer the following statement true (T) or false (F)