What is the physical basis for the "mitotic clock", which controls the number of divisions one cell can undertake?
What will be an ideal response?
telemoters
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Comparative genomics can be used to identify:
A. homologs, genes having demonstrable sequence similarity. B. homologs, genes having demonstrable sequence similarity and function. C. orthologs, genes in the same species that have demonstrable sequence similarity. D. orthologs, genes in the same species that have demonstrable sequence similarity and function. E. paralogs, genes in different species that have clear sequence similarity to each other.
Why do positively charged amino acids appear more often than usual in histone proteins?
A. Because histones have a higher molecular mass, which improves DNA compaction B. Because histones are strongly attracted to the positively charged phosphate backbone of DNA C. Because histones and DNA have opposite charges, which improves the compaction of DNA into nucleosomes D. Because histones and DNA have the same charge, which improves the compaction of DNA into nucleosomes
How do somatic neurons and autonomic neurons differ? (Check all that apply.)
_____ Somatic neurons innervate the body surface, while autonomic neurons innervate internal structures. _____ Somatic neurons control skeletal muscle, while autonomic neurons control smooth and cardiac muscle. _____ Somatic neurons control exocrine glands, while autonomic neurons do not. _____ Somatic neurons control their effectors directly, while autonomic neurons use a series of neurons. _____ Somatic neurons are always excitatory, while autonomic neurons may be either excitatory or inhibitory.
The expression of genetic traits is the
A. genotype. B. genome. C. proteome. D. phenotype. E. proteotype.