In which of the following cases will a Barr body be seen?
A) only XX
B) XY
C) XO
D) only XXY
E) both XX and XXY
E) both XX and XXY
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Answer the following statements true (T) or false (F)
1. In an open circulatory system, there is no difference between blood and interstitial fluid. 2. Relative to closed circulatory systems, Open Circulatory Systems pump hemolymph at relatively high pressure. 3. Blood is typically delivered to respiratory structures at low pressures in closed circulatory systems. 4. Frogs have two atria, but only a single ventricle.
This polysaccharide is a chain of glucose units that are modified by having nitrogen-containing groups
It is the main structural fiber in the external skeletons of arthropods and is also a structural material in the cell walls of fungi.
a. chitin b. amylopectin c. cellulose d. glycogen e. amylose
In constructing phylogenetic trees, it is useful to think of monophyletic groups as being defined by ________
A) apomorphies B) plesiomorphies C) synapomorphies D) clades
Cartilaginous fishes differ from lampreys because they
A) have a three-chambered heart. B) are ectotherms. C) lack a skull. D) lack a skeleton. E) have jaws.