11 Jun Dothan BIOLOGY 12 – All the cells in our bodies
Question
1) All the cells in our bodies have the same genome, yet they are differentiated based on gene expression. In eukaryotes, gene expression can be controlled at several different levels. Discuss ONE type of control that occurs at the chromosomal/DNA level and ONE that occurs at the mRNA level. Compare these two controls in terms of timing and coordination within the cell.
2) What statement(s) below best describe coordinate control of genes in eukaryotic cells?
i. Genes involved in a related metabolic process are scattered over different chromosomes, but their coactivation is achieved because they share a specific combination of control elements that bind to the same activator molecules.
ii. Different genes that code for proteins involved in the same metabolic process share the same enhancer regions.
iii. The coordinated expression of different genes involved in the same metabolic process is enhanced by the bending of DNA to bring the bound activators closer to the promoter to form a transcription factory.
3) Programmed cell death (apoptosis) is sometimes called “controlled cell suicide.” Explain what happens during this process and discuss TWO specific consequences that could occur if apoptosis did not occur when it should.
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