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5 Written Questions

5 Matching Questions

  1. repetitive DNA
  2. euchromatin
  3. radioactive isotope
  4. histone
  5. telomere
  1. a The tandemly repetitive DNA at the end of a eukaryotic chromosome's DNA molecule that protects the organism's genes from being eroded during successive rounds of replication. See also repetitive DNA.
  2. b An isotope (an atomic form of a chemical element) that is unstable; the nucleus decays spontaneously, giving off detectable particles and energy.
  3. c Nucleotide sequences, usually noncoding, that are present in many copies in a eukaryotic genome. The repeated units may be short and arranged tandemly (in series) or long and dispersed in the genome.
  4. d The less condensed form of eukaryotic chromatin that is available for transcription.
  5. e A small protein with a high proportion of positively charged amino acids that binds to the negatively charged DNA and plays a key role in chromatin structure.

5 Multiple Choice Questions

  1. A Y-shaped region on a replicating DNA molecule where the parental strands are being unwound and new strands are growing.
  2. The DNA strand that provides the pattern, or template, for ordering the sequence of nucleotides in an RNA transcript.
  3. A virus that infects bacteria; also called a bacteriophage.
  4. An enzyme that cuts DNA or RNA, either removing one or a few bases or hydrolyzing the DNA or RNA completely into its component nucleotides.
  5. A discontinuously synthesized DNA strand that elongates by means of Okazaki fragments, each synthesized in a 5'3' direction away from the replication fork.

5 True/False Questions

  1. Single-strand DNA-binding protein (SSBPs)A protein that binds to the unpaired DNA strands during DNA replication, stabilizing them and holding them apart while they serve as templates for the synthesis of complementary strands of DNA.

          

  2. Leading strandA discontinuously synthesized DNA strand that elongates by means of Okazaki fragments, each synthesized in a 5'3' direction away from the replication fork.

          

  3. pyrimidineOne of two types of nitrogenous bases found in nucleotides, characterized by a six-membered ring. Cytosine (C), thymine (T), and uracil (U) are pyrimidines.

          

  4. heterochromatinEukaryotic chromatin that remains highly compacted during interphase and is generally not transcribed.

          

  5. bacteriumOne of two prokaryotic domains, the other being Archaea.

          

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