Choose two genes from Figure 4.6 and draw a graph to represent the change in transcription over time.

Elaborate briefly on two distinct mechanisms of eukaryotic post-transcriptional gene regulation. Type a short answer in the space provided below.

in a eukaryote cell, what do we call the DNA sequence that the specific transcription factor binds to

Researchers investigated whether time of day affects the rate at which certain mRNAs produced by plants are broken down. At either 1 hour after the start of the light period (morning) or 8 hours after the start of the light period (afternoon), the researchers treated identical plant seedlings with a compound that blocks transcription (time = 0 min). The researchers measured the percent remaining of two mRNAs, mRNA G and mRNA H, over the course of 120 minutes. The data are shown in Figure 1.   Which of the following observations would provide the strongest evidence that two plants belong to different biological species?   a.the leaves and flowers show morphological differences.   b. There are variations in their RNA sequences.   c.They produce viable but sterile offspring.   d.They occupy unique habitats in an ecosystem.

The number of protein-encoding genes in a prokaryotic cell equals the number of proteins that can be expressed in the same cell. However, a eukaryotic cell can express many more proteins than the number of protein-encoding genes in the same cell. Why is this the case? Explain in one sentence only.

Name one step of gene expression and describe one way that step differs between prokaryotes and eukaryotes.

Select four items that are involved in or related to transcriptional control of gene expression (in either pro- or eu-karyotes).  -Slide nucleosomes around -control membrane hydrophobicity -methylate DNA -protein denaturation -TFIID and its friends -control mRNA stability -control protein stability -operator/repressor -dynamic instability

List and describe the sequential steps of TRANSCRIPTION in prokaryotic (bacterial) cells

You conduct an experiment to study the expression of the S protein through the tissues of your favorite plant (Arabidopsis thaliana). The morning of the experiment you inject in the leaves a messenger RNA that codes for the synthesis of a single protein made of two parts that are attached to each other: the functional S protein and a red fluorescent protein tag (RFP). You perform two cross sections of the same root, one section at the start of the experiment (time = Oh; corresponding to the time of injection) and one section in the afternoon (time = 8h). Through fluorescent microscopy you observe a change in the coloration inside the cells of the root's central tissues (as indicated by the arrows): from no coloration (time = Oh) to red (time = 8h). • The cells of the central tissues in the roots do not have nuclei or ribosomes. How can you explain this change of coloration? Please provide a cellular feature that can lead to this. • What is one advantage of using an RFP-tag in an mRNA?…

Please draw a diagram to show the genomic organization of a gene with three exons