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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
Barbara McClintock, famous for discovering that genes might move within genomes, had her meticulous work ignored for nearly 4 decades, but eventually won the Nobel Prize. Why was her work so distrusted.
select a chromosomal disorder from the March of Dimes Foundation Website.
How many DNA fragments would be produced.
Discuss about human genetic modification for traits other than to correct disease phenotypes such as eye or hair color,, athleticism, handedness
Red-green color blindness in humans is inherited as an X-linked recessive condition. Consider reciprocal crosses between a color-blind parent.
Key factors which influence respiratory rate and depth are such as talking or coughing, (such as, sometimes we try to breath at a several pace to relax)
Use a flow chart or numbered list, trace the path of a water molecule through a plant. Begin with a water molecule in the soil and end with the water molecule as water vapor in the air.
Ribozymes have various catalytic activities with reactions that follow classical enzyme kinetics other than with low catalytic rate.
How do the cells of the cleaving starfish zygote obtain food.
A particular variety of corn has a gene for kernel color and a gene for height with the phenotypes CC,Cc: purple kernel.
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.
Identify whether transcription of the lac operon would be ON or OFF under the conditions listed below, for the following mutant strains of E. coli.
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