Of the following three types of nucleic acids—DNA, mRNA, tRNA—which is most likely to contain modified bases?
What will be an ideal response?
tRNA
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All chordates have a notochord, a postanal tail, segmental body wall muscles, a dorsal, hollow nerve cord, and a perforated pharynx
1.True 2.False
Which of the following measurements cannot be determined by a spirometer?
A) vital capacity B) inspiratory capacity C) tidal volume D) inspiratory reserve volume E) residual volume
Planarians lack dedicated respiratory and circulatory systems because _____
A) none of their cells are far removed from the gastrovascular cavity or from the external environment B) they lack mesoderm as embryos and, therefore, lack the adult tissues derived from mesoderm C) their flame bulbs can carry out respiratory and circulatory functions D) their body cavity, a pseudocoelom, carries out these functions
The sclera is continuous with the
Select one: a. cornea. b. iris. c. retina. d. choroid coat. e. fovea centralis.