In the double helix structure of nucleic acids, cytosine hydrogen bonds to
A) deoxyribose.
B) ribose.
C) adenine.
D) thymine.
E) guanine.
Answer: E) guanine.
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Biology Chapter 5
- Enzymes are
- Which of the following store and transmit hereditary information?
- Which of the following is a diverse group of hydrophobic molecules?
- The element nitrogen is present in all of the following except
- Which of the following is an example of hydrolysis?
- A new organism is discovered in the forests of Costa Rica. Scientists there determine that the polypeptide sequence of hemoglobin from the new organism has 72 amino acid differences from humans, 65 differences from a gibbon, 49 differences from a rat, and 5 differences from a frog. These data suggest that the new organism
- What is the structural feature that allows DNA to replicate?
- If one strand of a DNA molecule has the sequence of bases 5ʹATTGCA3ʹ, the other complementary strand would have the sequence
- Which of the following statements best summarizes the structural differences between DNA and RNA?
- The difference between the sugar in DNA and the sugar in RNA is that the sugar in DNA
- A double-stranded DNA molecule contains a total of 120 purines and 120 pyrimidines. This DNA molecule could be composed of
- If a DNA sample were composed of 10% thymine, what would be the percentage of guanine?
- Which of the following are nitrogenous bases of the purine type?
- Which of the following are nitrogenous bases of the pyrimidine type?
- Which of the following descriptions best fits the class of molecules known as nucleotides?
- Which of the following best describes the flow of information in eukaryotic cells?
- Of the following functions, the major purpose of RNA is to
- Which of the following statements about the 5ʹ end of a polynucleotide strand of DNA is correct?
- DNAase is an enzyme that catalyzes the hydrolysis of the covalent bonds that join nucleotides together. What would first happen to DNA molecules treated with DNAase?
- What is the term used for a protein molecule that assists in the proper folding of other proteins?
- The function of each protein is a consequence of its specific shape. What is the term used for a change in a proteinʹs three-dimensional shape or conformation due to disruption of hydrogen bonds, disulfide bridges, or ionic bonds?
- Which of the following uses the amino acid sequences of polypeptides to predict a proteinʹs three-dimensional structure?
- Roger Kornberg used this method for elucidating the structure of RNA polymerase.
- What method did Frederick Sanger use to elucidate the structure of insulin?