Ch. 11 Exploring DNA and Chromosome Structure

Which of the following nitrogenous bases is found only in DNA and not in RNA?

• Uracil

• Thymine

• Adenine

• Guanine

What is the name of the bond that connects nucleotides in a single strand of DNA?

• Hydrogen bond

• Peptide bond

• Phosphodiester bond

• Glycosidic bond

Which enzyme is responsible for unwinding the DNA double helix during replication?

• DNA polymerase

• Ligase

• Helicase

• Primase

What is the basic unit of chromatin structure in eukaryotic cells?

• Chromosome

• Nucleosome

• Histone

• Centromere

Which of the following best describes the directionality of DNA synthesis?

• 5' to 3'

• 3' to 5'

• Both directions simultaneously

• Random direction

Which enzyme removes RNA primers during DNA replication in prokaryotes?

• DNA polymerase I

• DNA polymerase III

• Ligase

• Topoisomerase

Which of the following is a purine base found in nucleic acids?

• Cytosine

• Thymine

• Adenine

• Uracil

Which process ensures that the genetic information is accurately passed from one cell generation to the next?

• Transcription

• Translation

• DNA replication

• RNA splicing

If a DNA strand has the sequence 5'-ATCGGTA-3', what is the complementary sequence?

• 5'-TACCGAT-3'

• 3'-TAGCCAT-5'

• 5'-TAGCCAT-3'

• 3'-TACCGAT-5'

Which of the following best explains the role of histones in chromosome structure?

• They synthesize DNA.

• They package and organize DNA into nucleosomes.

• They replicate DNA.

• They unwind DNA.