The shape of a virus is determined by its
A. envelope.
B. RNA.
C. DNA.
D. coat protein organization.
E. host.
D. coat protein organization.
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The skeletal elements that give support to a sponge's body are called
a. choanocytes. b. spongin. c. spicules. d. collar cells. e. porocytes.
Nuclear pore complexes allow RNA transcripts
to pass to the cytoplasm only when the transcripts a. are bound to specific proteins. b. are small enough. c. are attached to fat soluble molecules. d. contain specific introns. e. are attached to ribosome subunits manufactured in the nucleus
RNA molecules can both carry genetic information and be catalytic. This supports the proposal that
a) free nucleotides would not have been necessary ingredients in the synthesis of new RNA molecules. b) protobionts had an RNA membrane. c) RNA is a polymer of amino acids. d) RNA was the first hereditary information. e) RNA could make energy.
Which of the following is TRUE regarding viruses?
a. Pox virus replication occurs completely in the cytoplasm. b. Retroviruses have negative-strand ssRNA genomes that are converted to dsDNA. c. Reoviruses typically evolve by antigenic shift and antigenic drift. d. ?X174 is a temperate phage that infects Crenarchaeota.