Exam 11: Chromosome Structure and Organelle Dna

When chromatin from any eukaryote is digested with micrococcal nuclease (an endonuclease) and fractionated using electrophoresis, DNA fragments of approximately 200 base pairs in length are observed. Which of the following statements explain(s) the observation? (Select all that apply.)

An Alu sequence is an example of which type of DNA sequence in eukaryotes?

The classic experiment that examined DNAse I sensitivity of chicken embryonic DNA from different tissues and at different developmental stages shows that: (Select all that apply.)

You are studying a small eukaryotic gene of about 2000 bp in length. Estimate how many copies of histone H1 you would find along this region of the chromosome.

Which of the following terms describe the feature(s) of mtDNA and cpDNA that differ from the eukaryotic nuclear DNA? (Select all that apply.)

A new Drosophila phenotype is investigated with a series of crosses. P (parental) organisms are true-breeding. The following is the first cross: Which of the following CORRECTLY predict(s) the F₂ results, if the allele that causes the mutant phenotype is X-linked recessive? (Select all that apply.)

Jack and Jill's son Jake has a severe case of myclonic epilepsy and ragged-red fiber (MERRF) syndrome. His case includes frequent and disabling myclonic seizures (involuntary twitching of the muscles) along with hearing loss, exercise intolerance, and poor night vision. Like most cases of MERRF, his case is associated with a mitochondrial mutation that he inherited from his mother Jill. His mother doesn't know that she harbors the MERRF mutation among her mtDNA molecules, but she has experienced occasional mild muscle twitching throughout her life and she does not see very well at night. What is/are the MOST likely explanation(s) for the difference in the severity of MERRF between Jake and his mother? (Select all that apply.)

The _____ membrane of the chloroplast bears the enzymes and pigments required for photophosphorylation.

DNA can be isolated from cells, and the different types of DNA from the cell can be separated by density gradient centrifugation. The following figures show the density gradient centrifugation profiles for DNA isolated from four different cell types: plant, animal, wild-type yeast with a plasmid, and petite yeast. - Which figure has the DNA profile for the plant cell?

Where would you expect to find the variant histone CenH3?

A gene-encoding sequence is an example of which type of DNA sequence in eukaryotes?

Alterations of chromatin of DNA structure that are stable and inheritable in offspring via DNA methylation or alteration of histone proteins is referred to as _____ changes.

Which of the following statements is NOT true of bacterial DNA?

Using the pedigree below, explain whether each of the following inheritance patterns is possible for the phenotype being followed citing specific individuals in your answer: X-linked dominant, X-linked recessive, Y-linked, mitochondrial, autosomal recessive, and autosomal dominant.

The _____ theory states that the ancestors of mitochondria and chloroplasts were free-living bacteria.

A ribosomal RNA gene is an example of which type of DNA sequence in eukaryotes?

If a bacterial chromosome were inserted into a eukaryotic cell, would it be stable? Would it segregate like eukaryotic chromosomes do during mitosis and meiosis? Why or why not?

A plant has green leaves with multiple yellow spots. When used as an egg donor in a cross with a normal plant that has all green leaves, some of the progeny have green and yellow leaves and some have all green leaves. When used as the pollen donor in a cross with a normal plant, all the progeny have all green leaves. Which of the following statements explain(s) the result of this cross? (Select all that apply.)

DNA can be isolated from cells, and the different types of DNA from the cell can be separated by density gradient centrifugation. The following figures show the density gradient centrifugation profiles for DNA isolated from four different cell types: plant, animal, wild-type yeast with a plasmid, and petite yeast. -The large peak to the left in all the figures is:

A normal chromosome in a higher eukaryotic species would NOT be expected to contain: