Many of the burrowing animals of the mud flat must actively
a. keep digging to exchange gasses.
b. circulate water through their burrows.
c. live near natural breaks in the sediment for gas exchange.
d. maintain an anaerobic environment.
B
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In combination, the products of gap genes, pair-rule genes, and segmentation polarity genes _____
A) trigger the reorganization of the larval body into an adult body B) define the segmented body plan of the embryo C) set up the back-to-belly axis of the larval body D) direct cell movements during differentiation
Nonenveloped viruses most often gain access to eukaryotic host cells by
A. fusion with the host cell plasma membrane followed by entrance of the nucleocapsid into the cytoplasm. B. nucleic acid injection through the plasma membrane. C. endocytosis. D. pinocytosis.
Lipid enclosed collections of molecules formed the first ________
a. cells b. bacteria c. mitochondria d. fungi e. protocells
In a mutation,
a. the new codon may specify a different amino acid but may not change the function of the new protein produced. b. the new codon may specify the same amino acid as the old codon. c. the new codon and resulting amino acid may destroy the function of the protein specified. d. the new codon may specify no amino acid. e. all of these may be true.