Exam 16: The Structural Basis of Cellular Information: Dna, chromosomes, and the Nucleus

You are given two samples of DNA,one from Clostridium perfringens and the other from Mycobacterium tuberculosis.Unfortunately,the labels on the tubes of DNA were accidentally removed,and you do not know which DNA sample belongs to which organism.As you were doing some work with Escherichia coli in the lab,you also have some of its DNA available as well.The %G + %C values for each of the organisms is known (C.perfringens,27%; M.tuberculosis,67%; E.coli,50%).Based upon this information,how could you quickly determine the source of the DNA for your two samples?

DNA is different from RNA in that

Which type of DNA makes up the smallest portion of the human genome?

________ is a DNA hybridization technique that can localize specific sequences and chromosomes inside a cell.

________,also known as "jumping genes," are examples of mobile DNA elements.

The 5' end of a DNA molecule can be chemically distinguished from the 3' end because there is a(n)________ group at the 5' end and a(n)________ group at the 3' end.

Which of the following statements regarding the Watson-Crick model of DNA is false?

Interspersed repeated DNA

Which of the following shows Chargaff's equivalence?

Which of the following structures contains the receptor protein importin?

Repeating DNA sequences that catalyze their own replication and can move to a new location in a genome are called ________.

Unusual eukaryotic-like (possessing a defined nucleus)cells were obtained from a sample of water from a subglacial antarctic lake.To investigate the properties of the new organism's genome,the nucleus was carefully isolated and the chromatin obtained.The fibers had a "beads on a string" appearance,suggesting some type of "histones." Following digestion with micrococcal nuclease,protein removal,and gel electrophoresis,DNA fragments were obtained that are multiples of 280 base pairs in length.Longer incubation with micrococcal nuclease prior to protein removal results in fragments 200 base pairs in length.The amount of DNA that is wrapped around the "core histones" is therefore

Mitochondrial and chloroplast genomes typically

Which of the following is the correct order of the levels of DNA packaging in eukaryotic chromosomes?

Compare and contrast the packaging and composition of DNA in prokaryotes and eukaryotes.Does the large amount of DNA in eukaryotic cells directly reflect the number of genes in eukaryotic cells compared to prokaryotic cells or are there other factors involved?

Long interspersed nuclear elements (LINEs)found in eukaryotic genomes