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During diauxic growth involving glucose and lactose, bacterial cells

The genetic code and wobble rules for tRNA-mRNA pairing are shown above. If we assume that the tRNAs do not contain modified bases, what is the minimum number of tRNAs that are needed to recognize all of the alanine codons?

What is an activator?

During transcription, the removal of histone proteins from the DNA is important for

Regulatory transcription factors may be controlled by

  In humans, a recent study has shown that maternal anxiety during pregnancy can diminish the methylation of the ICR located between the H19 and Igf2 genes of the embryo and fetus. How would this affect the expression of the maternal and paternal alleles of the Igf2 gene after the baby is born?  

Two genes, Xist and Tsix play key roles in X-chromosome inactivation. After X-chromosome inactivation occurs, where is the Xist gene expressed?

Where are nucleosome-free regions typically found in a eukaryotic genome?

The Avy allele of the Agouti gene involves the insertion of a transposable element upstream from the normal Agouti promoter. The transposable element carries a promoter that causes the over expression of the Agouti gene. Mice carrying this allele tend to have coat colors that are more yellow than mice that don’t have this transposable element. If pregnant female mice are fed a diet that contains chemicals that increase DNA methylation, how would you expect that this diet would affect the coat color of offspring carrying the Avy allele?

Which of the following is not a reason why histones are removed (evicted) so that eukaryotic genes can be transcribed?