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Question 1Select one answer.CRP protein binds to the lac operon under conditions of low glucose. Its role in the expression of genes in the lac operon is:A. to transcribe DNA to mRNA for the structural genes in the operator.B. It increases the binding of lactose to the lac repressor, causing it to be released from the operator.C. It enhances the binding of RNA polymerase to the lac operon, increasing transcriptionD. It bumps the lac repressor off the DNA, allowing transcription of the genes for lactose metabolism.Question 2Select one answer.Which of the following refers to variations in the same gene, which result in different phenotypes?A. ChromosomeB. DNAC. AlleleD. GenotypeQuestion 3Select one answer.When bacteria are grown in lactose they produce enzymes required for lactose metabolism. When placed in glucose, these enzymes are no longer produced. The expression of these genes is likely due to:A. Uncondensing of the DNA, to allow for expression of the genes.B. mutations accumulated in the regulatory region of the gene that code for lactose metabolizing enzymes.C. Changing the behavior of a DNA binding protein that regulates expression of these genes.Question 4Select one answer.Eukaryotic DNA is packaged into nucleosomes due to the action ofA. histonesB. DNA helicasesC. repressor proteinsD. RNA polymerasesQuestion 5Select one answer.In what type of cell do genes contain exons which are interrupted by introns, that are spliced out after transcription.A. ProkaryoticB. EukaryoticC. Both prokaryotic and eukaryotic cells.Question 6Select one answer.Assuming that the genes required for sucrose (table sugar) degradation are contained within an operon, then under conditions of low sucrose, you would expect:A. The repressor protein to bind to the operator, preventing transcription.B. The repressor protein to bind to the operator, allowing transcription.C. The repressor protein released from the operator, allowing transcription.D. The repressor protein released from the operator, preventing transcription.Question 7Select one answer.Which of the following represents a change that CANNOT be passed on to the next generation?A. Changes in gene expression due to increased production of a hormone.B. Changes in DNA packaging leading to gene silencing.C. Changes in DNA sequence due to exposure to radiation.D. None of the above, they are all heritable changes.Question 8Select one answer.DNA resides in the nucleus of the cell in a prokaryotic cell, but not a eukaryotic cell.A. TrueB. False
Compared to a carbon atom with only single covalent bonds, a carbon with a double bond 1 Shares fewer electron pairs with other atoms two Is more flexible in the spatial arrangement.
In dogs, colored fur is dominant to un-colored fur. Black fur color is dominant to brown fur color. The E gene is epistatic to the B gene.
mechanism for ensuring adequate amount of neurotransmitter.
Briefly explain why this mating produces a triploid individual. Why can mitosis proceed normally in triploid cells, but meiosis cannot.
Discuss how does the burning of a candle relate to biological processes and biology in general? Any help would be appreciated thank you.
Use the protein Dynorphin as an example, Explain the cellular production process for creating and secreting of this protein for use in the body.
Discuss the difference between structural colors and colors based on pigments? How do the chromatophores of vertebrates and cephalopod molluscs differ in structure and function?
A young researcher at National Institute Health and interested in eye development, and hoping to find a cure to blindness in your lifetime
In the harlequin-chromosome technique, you allow THREE rounds of replication in bromodeoxyuridine and then stain the chromosomes. What result do you expect to obtain.
Calculate how you will accomplish this task.
A certain allele of the ApoE gene in humans has been linked to an increase in susceptibility to Alzheimer's disease, which causes dementia. What is the advantage for higher eukaryotes to include introns within their pre-mRNA transcripts?
how to Increasing the percent of acrylamide
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