Which structure is not a major diagnostic feature of the chordates?
(a) dorsal hollow nerve cord.
(b) notochord.
(c) pharyngeal gill slits.
(d) vertebral column.
(d) vertebral column.
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Which is NOT a component of blood?
a. erythrocytes b. osteocytes c. leukocytes d. platelets e. plasma
Based on hierarchical levels of biological organization, which of these choices represents the broadest level?
A. Jaguars, giant anteaters, macaws, capybaras B. Endocrine system C. 3 toed sloths D. Amazon Basin E. School of piranhas
Fungi obtain nutrients by ________ digestion.
Fill in the blank(s) with the appropriate word(s).
The enzyme ________ adds nucleotides of DNA in the ________ direction when DNA is being semi-conservatively replicated.
A. DNA polymerase I, 5' ? 3' B. DNA polymerase I, 3' ? 5' C. DNA polymerase III, 3' ? 5' D. DNA polymerase III, 5' ? 3'