The genetic material for a prokaryotic cell is present in a ____, a poorly demarcated region of the cell that lacks a boundary membrane to separate it from the surrounding cytoplasm.
A) nucleoid
B) nucleus
C) genetome
D) chromatic region
E) pharmacopeia
Ans: A) nucleoid
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Choose the true statements about the human and tiger pufferfish genomes.
_____ Genes regulating the basic cellular metabolism are conserved in both human and pufferfish genomes. _____ About 25% of the human genes have no counterpart in the pufferfish genome. _____ Being ancestral to humans, the pufferfish genome has more repetitive DNA than the human genome does. _____ The pufferfish genome has twice the amount of DNA as the human genome does.
What is the term for mutant alleles that can act dominantly to predispose a cell to a cancerous phenotype?
A) Polymerases B) Oncogenes C) Activators D) Tumor-suppressor genes
Which terms accurately reflect the nature of replication of the chromosome in E. coli?
A) unidirectional and fixed point of initiation B) bidirectional and fixed point of initiation C) bidirectional and multirepliconic D) multirepliconic and telomeric E) unidirectional and reciprocal
When a concept has been tested repeatedly and appears to be a uniform or constant fact of nature, it is called
A. empirical evidence. B. a hypothesis. C. a deduction. D. a law.