In trying to determine whether DNA or protein is the genetic material, Hershey and Chase made use of which of the following facts?
A) DNA contains sulfur, whereas protein does not.
B) DNA contains phosphorus, whereas protein does not.
C) DNA contains nitrogen, whereas protein does not.
D) DNA contains purines, whereas protein includes pyrimidines.
E) RNA includes ribose, whereas DNA includes deoxyribose sugars.
Answer: B
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Biology
- For a science fair project, two students decided to repeat the Hershey and Chase experiment, with modifications. They decided to label the nitrogen of the DNA, rather than the phosphate. They reasoned that each nucleotide has only one phosphate and two to five nitrogens. Thus, labeling the nitrogens would provide a stronger signal than labeling the phosphates. Why won't this experiment work?
- Which of the following statements describes chromatin?
- Which of the following represents the order of increasingly higher levels of organization of chromatin?
- Why do histones bind tightly to DNA?
- Which of the following statements is true of histones?
- If a cell were unable to produce histone proteins, which of the following would be a likely effect?
- Which of the following statements describes the eukaryotic chromosome?
- In a linear eukaryotic chromatin sample, which of the following strands is looped into domains by scaffolding?
- Studies of nucleosomes have shown that histones (except H1) exist in each nucleosome as two kinds of tetramers: one of 2 H2A molecules and 2 H2B molecules, and the other as 2 H3 and 2 H4 molecules. Which of the following is supported by this data?
- Which of the following sets of materials are required by both eukaryotes and prokaryotes for replication?
- Which of the following would you expect of a eukaryote lacking telomerase?
- Individuals with the disorder xeroderma pigmentosum are hypersensitive to sunlight. This occurs because their cells are impaired in what way?
- Which of the following help(s) to hold the DNA strands apart while they are being replicated?
- What is the role of DNA ligase in the elongation of the lagging strand during DNA replication?
- What is the function of topoisomerase?
- A new DNA strand elongates only in the 5' to 3' direction because
- The leading and the lagging strands differ in that
- The difference between ATP and the nucleoside triphosphates used during DNA synthesis is that
- What is the function of DNA polymerase III?
- To repair a thymine dimer by nucleotide excision repair, in which order do the necessary enzymes act?
- Polytene chromosomes of Drosophila salivary glands each consist of multiple identical DNA strands that are aligned in parallel arrays. How could these arise?
- At a specific area of a chromosome, the sequence of nucleotides below is present where the chain opens to form a replication fork: 3' C C T A G G C T G C A A T C C 5' An RNA primer is formed starting at the underlined T (T) of the template. Which of the following represents the primer sequence?
- The DNA of telomeres has been found to be highly conserved throughout the evolution of eukaryotes. What does this most probably reflect?
- The enzyme telomerase solves the problem of replication at the ends of linear chromosomes by which method?
- Eukaryotic telomeres replicate differently than the rest of the chromosome. This is a consequence of which of the following?
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