18.2.3 DNA

• What does DNA stand for?

  Deoxyribonucleic acid
• DNA is a nucleic acid that stores and transmits genetic information.
• The two strands of DNA are held together by covalent bonds.

  False
• Match the base pair with the number of hydrogen bonds between them:

  Adenine (A) - Thymine (T) ↔️ 2

  Guanine (G) - Cytosine (C) ↔️ 3
• The structure of DNA is a double helix.
• How many hydrogen bonds are between adenine and thymine?

  2
• Each nucleotide in DNA contains a deoxyribose sugar and a phosphate group.
• Arrange the components of a DNA nucleotide in order:

  1️⃣ Deoxyribose sugar

  2️⃣ Phosphate group

  3️⃣ Nitrogenous base
• What are the four nitrogenous bases in DNA?

  A, G, C, T
• Guanine pairs with cytosine using three hydrogen bonds.
• Which nitrogenous base pairs with Adenine (A) in DNA?

  Thymine (T)
• Adenine (A) pairs with Thymine (T) through 2 hydrogen bonds.
• What is the fundamental structure of DNA called?

  Double helix
• DNA stores and transmits genetic information from one generation to the next.
• DNA's double helix structure allows it to efficiently store and pass on genetic information.
• What determines the genetic code in DNA?

  Sequence of nitrogenous bases
• What does the acronym DNA stand for?

  Deoxyribonucleic acid
• Match the components of a DNA nucleotide with their descriptions:

  Deoxyribose sugar ↔️ A five-carbon sugar found in DNA

  Phosphate group ↔️ A chemical group attached to the sugar

  Nitrogenous base ↔️ One of four molecules: A, G, C, or T
• DNA is a type of nucleic acid that stores and transmits genetic information.
• How many different nitrogenous bases are found in DNA?

  Four
• DNA is composed of two strands held together by hydrogen bonds.
• What is the chemical symbol for a phosphate group in DNA?

  $PO_{4}$
• DNA is a nucleic acid that stores and transmits genetic information
• What does DNA stand for?

  Deoxyribonucleic acid
• DNA is composed of nucleotides, each containing a deoxyribose sugar, a phosphate group, and a nitrogenous base.
• Match the nitrogenous base with its abbreviation:

  Adenine ↔️ A

  Guanine ↔️ G

  Cytosine ↔️ C

  Thymine ↔️ T
• The structure of DNA is a double helix held together by hydrogen bonds between specific base pairs
• Hydrogen bonds in DNA are responsible for holding the two strands of the double helix together.
• How many hydrogen bonds are formed between adenine and thymine in a DNA base pair?

  2
• Guanine forms a base pair with cytosine using three hydrogen bonds
• The specific base pairing rules in DNA allow for efficient storage and transmission of genetic information.
• Arrange the following nitrogenous bases in order of their pairing in DNA:

  1️⃣ Adenine - Thymine

  2️⃣ Guanine - Cytosine
• What is the shape of the DNA molecule?

  Double helix
• Hydrogen bonds hold the two strands of DNA together.
• Each strand of DNA is composed of nucleotides
• Match the nitrogenous base with its correct pair and number of hydrogen bonds:

  Adenine ↔️ Thymine, 2

  Guanine ↔️ Cytosine, 3
• What type of sugar is found in DNA?

  Deoxyribose
• Adenine always pairs with Guanine in DNA.

  False
• Adenine and Thymine are held together by 2 hydrogen bonds.
• What is the phosphate group in DNA called?

  $PO_{4}$