All of the following are vesicles of the five vesicle stage, EXCEPT
A. Diencephalon
B. Forebrain
C. Mesencephalon
D. Metencephalon
E. Myelencephalon
Answer: B. Forebrain
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Antigenic variation is common in influenza B and C but is rare in influenza A.
Answer the following statement true (T) or false (F)
The primary RNA transcript in eukaryotes is
A. mRNA before the exons have been removed. B. tRNA before it forms its hairpin loops. C. mRNA after the introns have been removed. D. rRNA before it forms the ribosome. E. mRNA before the introns have been removed.
The resting potential of a neuron primarily is established by movement of _______ ions out of the cell.
Fill in the blank(s) with the appropriate word(s).
Which of the following is a characteristic of annelids?
A. radial symmetry B. cephalization C. psuedocoelom D. closed circulatory system E. incomplete digestive tract