Which one of the following is necessary for messenger RNA to be formed in the nucleus?
A. Ribosomes must be present.
B. The cell must have an abundant supply of DNA nucleotides.
C. RNA polymerase must be present and functioning.
D. Chromosomes must be synapsed.
C. RNA polymerase must be present and functioning.
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Which cytoskeletal proteins are important constituents of the contractile structures that form the cleavage furrows involved in animal cell cytokinesis?
A) actin B) dynein C) tubulin D) myosin
The depth distribution of algae is limited by:
a. temperature. b. pressure. c. pH. d. light quality. e. salinity.
Which of the following diseases is NOT caused by viruses?
the common cold and influenza smallpox and mononucleosis polio and rabies AIDS and warts diabetes
Aspiration pneumonia can be caused by a chemical exposure or by bacterial or viral pathogens
Indicate whether the statement is true or false