Nucleic Acids and DNA Structure
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Questions and Answers

What are nucleic acids classified as?

  • Carbohydrates
  • Macromolecules/Polymers (correct)
  • Proteins
  • Lipids

What are the monomers that make up nucleic acids called?

nucleotides

What are the three components of a DNA nucleotide?

deoxyribose, a phosphate group, a nitrogenous base

What are the four nitrogenous bases found in DNA?

<p>cytosine, guanine, thymine, adenine</p> Signup and view all the answers

DNA is a single-stranded molecule.

<p>False (B)</p> Signup and view all the answers

How are the two strands of a DNA molecule related?

<p>complementary</p> Signup and view all the answers

What is the process of making an extra copy of a DNA molecule called?

<p>replication</p> Signup and view all the answers

What enzyme bonds one DNA nucleotide to another?

<p>polymerase</p> Signup and view all the answers

Match the following complementary DNA bases:

<p>A = T G = C</p> Signup and view all the answers

What does DNA replication result in?

<p>two identical molecules of DNA</p> Signup and view all the answers

What are the three components of an RNA nucleotide?

<p>ribose, a phosphate group, a nitrogenous base</p> Signup and view all the answers

What base does RNA have instead of thymine?

<p>uracil</p> Signup and view all the answers

RNA is a double-stranded molecule.

<p>False (B)</p> Signup and view all the answers

What is the process of making messenger RNA from a DNA template called?

<p>transcription</p> Signup and view all the answers

In which part of the cell does transcription occur?

<p>nucleus</p> Signup and view all the answers

What is the process of making a polypeptide from mRNA called?

<p>translation</p> Signup and view all the answers

What are polypeptides made of?

<p>amino acids</p> Signup and view all the answers

Translation occurs on what structures in the cell?

<p>ribosomes</p> Signup and view all the answers

Where are ribosomes located?

<p>cytoplasm</p> Signup and view all the answers

What type of RNA molecule brings amino acids to the ribosomes?

<p>tRNA</p> Signup and view all the answers

What are groups of three bases on mRNA that each code for an amino acid called?

<p>codons</p> Signup and view all the answers

What are the complementary RNA bases?

<p>A = U G = C</p> Signup and view all the answers

Study Notes

Nucleic Acids

  • Nucleic acids are macromolecules classified as DNA and RNA.
  • The building blocks of nucleic acids are called nucleotides.

DNA Structure

  • Each DNA nucleotide comprises a 5-carbon sugar (deoxyribose), a phosphate group, and a nitrogenous base.
  • The four nitrogenous bases in DNA are cytosine, guanine, thymine, and adenine.
  • DNA is a double-stranded molecule, with strands that are complementary but not identical.

DNA Replication

  • The replication process generates an extra copy of a DNA molecule.
  • The enzyme responsible for linking DNA nucleotides is DNA polymerase.
  • During replication, bases pair complementarily: adenine pairs with thymine (A with T) and guanine pairs with cytosine (G with C).
  • Replication results in two identical DNA molecules, each a copy of the original.

RNA Structure

  • RNA nucleotides consist of a sugar (ribose), a phosphate group, and one of four nitrogenous bases: adenine, guanine, cytosine, or uracil.
  • Uracil replaces thymine, which is found in DNA.
  • RNA is a single-stranded molecule.

Transcription and Translation

  • Transcription is the process of synthesizing messenger RNA (mRNA) from a DNA template using RNA nucleotides.
  • Transcription occurs in the nucleus of the cell.
  • Translation involves creating a polypeptide from mRNA and amino acids, occurring on ribosomes.
  • Ribosomes, located in the cytoplasm, serve as the site of translation.

Amino Acids and Polypeptides

  • Polypeptides are polymers made of monomers known as amino acids.
  • Transfer RNA (tRNA) is responsible for transporting amino acids to the ribosomes during translation.

Codons

  • Codons are groups of three bases on mRNA that each correspond to a specific amino acid.
  • In RNA, complementary bases are adenine with uracil (A with U) and guanine with cytosine (G with C).

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Description

Explore the fundamentals of nucleic acids, including their classifications as DNA and RNA. Learn about the structure of DNA, the process of DNA replication, and the distinct features of RNA. This quiz covers key concepts like nucleotides, complementary base pairing, and the role of DNA polymerase.

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