DNA and RNA contain functional units known as:
A. peptides.
B. enzymes.
C. amino acids.
D. nucleotides.
E. fatty acids.
D
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Parazoa
A. are pseudocoelomates. B. exhibit bilateral symmetry. C. include Cnidaria and Ctenophora. D. exhibit primitive segmentation. E. have no true tissues.
How is translation initiated?
A. Two ribosomal subunits bind to the DNA sequence. B. Two ribosomal subunits bind to the mRNA transcript. C. DNA helicase binds to the origins of replication. D. RNA polymerase binds to the promoter sequence.
Some invertebrates can move gases across
their cell's membrane by ___ through interstitial fluid
a. active transport b. facilitated diffusion c. bulk transport d. simple diffusion e. osmosis
How does a shark's cardiovascular system differ from that of a mammal?
A) The shark's heart does not directly pump oxygenated blood to the systemic tissues. B) The shark's heart receives both oxygenated and deoxygenated blood. C) The shark's circulatory system has a pulmonary and a systemic circuit. D) The shark's blood is pumped through open-ended tubes.