Which of the following statements in TRUE?
A. Many active genes are found in euchromatin, because proteins involved in transcription can easily access these regions of DNA.
B. Euchromatin, found in interphase cells, is readily visible and easily viewed.
C. A region of DNA is either heterochromatin or euchromatin, it cannot go back and forth between the two forms.
D. When DNA is being replicated, the chromosomes are composed chiefly of heterochromatin.
E. All choices are correct.
A. Many active genes are found in euchromatin, because proteins involved in transcription can easily access these regions of DNA.
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Water is ______, therefore _____ substances dissolve in it.
a. polar, nonpolar b. polar, polar c. nonpolar, polar d. nonpolar, nonpolar
In a population that is in Hardy-Weinberg equilibrium for two alleles, C and c, for a character determined by complete dominance, 16% of the population show a recessive trait. Assuming C is dominant to c, what percent of individuals show the dominant trait?
a. 36% b. 48% c. 84% d. 60% e. 96%
The Pribnow box of E. coli
A. is centered approximately 10 bp upstream of the start site of transcription. B. is centered between 7 and 13 bp upstream of the start codon. C. is located at the site of addition of poly (A) in eukaryotic mRNAs. D. is centered approximately 35 bp upstream of the start site of transcription.
To which subtype of muscle tissue does a fiber with cross-striations and many peripherally located nuclei belong?
(a) skeletal. (b) cardiac. (c) smooth. (d) none of the above.