As a result of __________, large dogs such as Great Danes do not normally mate with small dogs such
as Poodles.
a. temporal isolation
b. mechanical isolation
c. gametic isolation
d. sexual isolation
e. postzygotic barriers
B
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Which of the following invertebrates has an
endoskeleton?
a. clams b. lobsters c. sea stars d. earthworms e. more than one of these invertebrates has an endoskeleton
The final step in the clotting pathway is ____
a. activation of thrombin b. platelet plug formation c. vessel spasm d. conversion of fibrinogen to fibrin e. activation of factor X
A segmented worm has male and female reproductive organs in each segment. Some use hooks to attach to the intestinal wall. Which type of worm is this?
A. fluke ?B. nematode ?C. cestode ??D. annelid
Many of the molecules that actively maintain the integrity of a cell's chromosomes, particularly during DNA replication and mitosis, are involved in crossing over during ____ of meiosis.
A. prophase II B. prophase I C. metaphase II D. metaphase I E. telophase II