Podcast
Questions and Answers
Which of the following is a correct statement about nucleotides?
Which of the following is a correct statement about nucleotides?
- Nucleotides are composed of a sugar group, a phosphate group, and a nitrogenous base. (correct)
- Pyrimidines are always found in the sugar-phosphate backbone of a nucleotide.
- The formation of a nucleotide involves the removal of water during bonding of the base and sugar.
- Nucleotides contain either adenine or cytosine as the nitrogenous base.
Which nitrogenous base is a pyrimidine in DNA?
Which nitrogenous base is a pyrimidine in DNA?
- Uracil
- Adenine
- Cytosine (correct)
- Guanine
Why are purines called such in the context of nucleic acids?
Why are purines called such in the context of nucleic acids?
- Due to their single carbon ring structure.
- Purines form phosphodiester bonds in the sugar-phosphate backbone.
- Because they contain 4 nitrogen atoms and two carbon rings. (correct)
- Purines are only found in RNA molecules.
Which type of organic compound is present in both purines and pyrimidines?
Which type of organic compound is present in both purines and pyrimidines?
What process occurs when a nucleotide is formed by bonding a base to a sugar molecule?
What process occurs when a nucleotide is formed by bonding a base to a sugar molecule?
In DNA, which bases pair together based on complementary hydrogen bonding?
In DNA, which bases pair together based on complementary hydrogen bonding?
What type of bond is formed between two nucleotides to create a polynucleotide strand?
What type of bond is formed between two nucleotides to create a polynucleotide strand?
How do purines and pyrimidines join together in DNA structure?
How do purines and pyrimidines join together in DNA structure?
Which part of the sugar molecule determines the direction of the DNA strand?
Which part of the sugar molecule determines the direction of the DNA strand?
What is the term used to describe the rigid structure formed by the covalent bonds between sugars and phosphates in DNA?
What is the term used to describe the rigid structure formed by the covalent bonds between sugars and phosphates in DNA?
In a double helix structure, what causes two nucleic acid chains to join together?
In a double helix structure, what causes two nucleic acid chains to join together?
Which end of a DNA strand is referred to as the '3’ end' based on its sugar composition?
Which end of a DNA strand is referred to as the '3’ end' based on its sugar composition?
What is the reason behind DNA strands being complementary?
What is the reason behind DNA strands being complementary?
Why does the phosphate/ribose backbone of DNA orient itself outward?
Why does the phosphate/ribose backbone of DNA orient itself outward?
How many hydrogen bonds form between Adenine and Thymine in DNA base pairing?
How many hydrogen bonds form between Adenine and Thymine in DNA base pairing?
In the double helix structure of DNA, what allows for the most stable energy configuration?
In the double helix structure of DNA, what allows for the most stable energy configuration?
How many base pairs typically rotate per turn in the stable double helix arrangement of DNA?
How many base pairs typically rotate per turn in the stable double helix arrangement of DNA?
What makes RNA different from DNA in terms of nucleotide composition?
What makes RNA different from DNA in terms of nucleotide composition?
