DNA structure quiz

1. How many strands make up a DNA double helix?

• two linked strands

• one strand

• 3 linked strands

1. What holds one strand against the other in the double helix?

• hydrogen bonds

• nucleotides

• deoxuribose

1. What is a "codon"?

• a sequence of three nucleotides

• an amino acid

• a deoxyribode

Transcription, as related to genomics, is the process of making an ___ copy of a gene's DNA sequence.

When do cells duplicate their DNA?

• never

• during prophase

• during interphase

DNA contains four basic building blocks or 'bases': adenine (A), cytosine (C), _______(G) and thymine (T)

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

• DNA polymerase

• Helicase

• Ligase

1. What is the role of mRNA in protein synthesis?

• It carries amino acids to the ribosome

• It forms the structure of ribosomes

• It carries the genetic code from DNA to the ribosome

1. Which base is not found in DNA but is present in RNA?

• Thymine

• Uracil

• Cytosine

1. What is a "nucleotide"?

• a sequence of three nucleotides

• the building block of DNA and RNA, consisting of a base, a sugar, and a phosphate group

• a deoxyribode