Cell Cycle and Division

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Questions and Answers

What is the number of chromosomes in a human cell?

  • 46 (correct)
  • 48
  • 23
  • 50

What is the term for the division of the cytoplasm during cell division?

  • Cytokinesis (correct)
  • Karyokinesis
  • Meiosis
  • Mitosis

During which phase of the cell cycle does the cell prepare for division?

  • G1 phase
  • S phase
  • G2 phase (correct)
  • Mitosis

What is the term for the area where sister chromatids are connected?

<p>Centromere (C)</p> Signup and view all the answers

What happens to cells at the edge of an injury?

<p>They begin to divide rapidly (C)</p> Signup and view all the answers

What is the purpose of cell cycle regulators?

<p>To act as traffic signals during the cell cycle (D)</p> Signup and view all the answers

What happens to the rate of cell division during the healing process?

<p>It slows down (A)</p> Signup and view all the answers

What is the function of the G1 checkpoint?

<p>To regulate cell division (B)</p> Signup and view all the answers

What happens to cells that do not receive the 'go' signal at the G1 checkpoint?

<p>They exit the cell cycle and enter the G0 phase (A)</p> Signup and view all the answers

What is the main function of the G2 checkpoint?

<p>To repair DNA damages before entering mitosis (D)</p> Signup and view all the answers

What happens if a cell fails to pass the mitosis checkpoint?

<p>The cell will continue to divide uncontrollably (B)</p> Signup and view all the answers

What is the main difference between cancer cells and normal cells?

<p>Cancer cells do not respond to cell cycle regulation signals (B)</p> Signup and view all the answers

What is the main advantage of meiosis over asexual reproduction?

<p>Meiosis produces genetically diverse offspring (C)</p> Signup and view all the answers

What is a characteristic of asexual reproduction?

<p>All offspring are exactly alike (D)</p> Signup and view all the answers

How many cells are produced by an adult human body daily?

<p>Two trillion (A)</p> Signup and view all the answers

What is the result of mitosis in unicellular plants and animals?

<p>Production of new offspring by asexual reproduction (C)</p> Signup and view all the answers

Why is mitosis important in multicellular organisms?

<p>To maintain tissue growth and repair (A)</p> Signup and view all the answers

Which type of cells do not undergo cell division?

<p>Muscle cells and nerve cells (D)</p> Signup and view all the answers

What happens when cells come into contact with other cells?

<p>They stop growing (D)</p> Signup and view all the answers

What is the function of the anticodon on a tRNA molecule?

<p>To bind to the mRNA codon during translation (A)</p> Signup and view all the answers

What would happen if the reading of the mRNA codon starts at the wrong place?

<p>A polypeptide chain with the incorrect sequence would be formed (A)</p> Signup and view all the answers

What is the relationship between a tRNA molecule and a particular amino acid?

<p>Each tRNA molecule is specific for a particular amino acid (B)</p> Signup and view all the answers

What is the purpose of the codon sequence on an mRNA molecule?

<p>To specify the sequence of amino acids in a protein (C)</p> Signup and view all the answers

What is the role of a tRNA molecule during protein synthesis?

<p>To deliver amino acids to the ribosome during translation (C)</p> Signup and view all the answers

What is the sequence of the mRNA codons corresponding to the DNA sequence TAC TTA CAA ACC ATA ATT?

<p>AUG AAU GUU UGG UAU UAA (B)</p> Signup and view all the answers

What is the function of the tRNA anticodon?

<p>To recognize and bind to a specific mRNA codon during translation (A)</p> Signup and view all the answers

What is the name of the molecules that make up the ribosome?

<p>Ribosomal RNA (rRNA) (C)</p> Signup and view all the answers

Where are the large and small ribosomal subunits constructed and exported from?

<p>Nucleolus and exported to the cytoplasm (A)</p> Signup and view all the answers

What is the term for the process of creating a protein from a sequence of mRNA codons?

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

How many nitrogen bases are read together in the genetic code?

<p>Three (D)</p> Signup and view all the answers

What is the function of the start codon AUG in protein synthesis?

<p>It specifies the amino acid methionine (A)</p> Signup and view all the answers

How many possible codons are there in the genetic code?

<p>64 (C)</p> Signup and view all the answers

What is the function of stop codons in protein synthesis?

<p>They do not code for any amino acid (A)</p> Signup and view all the answers

What is the term for the process of synthesizing proteins from mRNA instructions?

<p>Translation (D)</p> Signup and view all the answers

What is the process by which DNA directs the synthesis of proteins?

<p>Gene expression (C)</p> Signup and view all the answers

What is the term for a sequence of three nucleotides that specifies an amino acid?

<p>Codon sequence (D)</p> Signup and view all the answers

What is the result of linking many amino acids together?

<p>A protein is made (D)</p> Signup and view all the answers

What is the function of a start codon?

<p>It indicates where the protein-building instructions begin (A)</p> Signup and view all the answers

How many different amino acids are there?

<p>20 (D)</p> Signup and view all the answers

What is the purpose of transcription in the context of gene expression?

<p>To copy one gene from the DNA molecule into a complementary RNA molecule (B)</p> Signup and view all the answers

What is the type of RNA molecule that is synthesized during transcription?

<p>Messenger RNA (mRNA) (B)</p> Signup and view all the answers

What is the role of the promoter in the transcription process?

<p>To bind RNA polymerase and initiate transcription (D)</p> Signup and view all the answers

What is the base pairing rule for adenine during transcription?

<p>Adenine pairs with uracil (C)</p> Signup and view all the answers

What is the function of the terminator in the transcription process?

<p>To mark the end of the gene and terminate transcription (D)</p> Signup and view all the answers

What is the primary function of RNA polymerase during transcription?

<p>To transcribe a single gene from the DNA template (D)</p> Signup and view all the answers

What happens to introns during RNA processing and editing?

<p>They are cut out and removed from the RNA (A)</p> Signup and view all the answers

What is the purpose of the mRNA transcript?

<p>To serve as instructions for protein synthesis at the ribosome (D)</p> Signup and view all the answers

What is the difference between exons and introns?

<p>Exons are involved in protein synthesis, while introns are not (B)</p> Signup and view all the answers

What is the result of transcription?

<p>A single-stranded RNA molecule (C)</p> Signup and view all the answers

What is the purpose of the cap and tail added to the RNA molecule?

<p>To help the ribosome identify the start and end of the instructions (A)</p> Signup and view all the answers

Why are introns present in genes?

<p>To allow a single gene to code for more than one type of protein (A)</p> Signup and view all the answers

What determines the type of protein that is made?

<p>The order in which the amino acids are joined (A)</p> Signup and view all the answers

What is the 'language' of mRNA instructions called?

<p>The genetic code (B)</p> Signup and view all the answers

What happens to introns during RNA processing and editing?

<p>They are cut out and removed (D)</p> Signup and view all the answers

What is the function of the start codon in protein synthesis?

<p>It marks the beginning of mRNA translation (D)</p> Signup and view all the answers

What is the role of tRNA in protein synthesis?

<p>To carry amino acids to the ribosome (C)</p> Signup and view all the answers

What is the relationship between mRNA and tRNA?

<p>tRNA reads the message carried by mRNA (A)</p> Signup and view all the answers

What is the function of ribosomal RNA (rRNA)?

<p>To bind mRNA and tRNA to the ribosome (B)</p> Signup and view all the answers

What is the sequence of nucleotides that dictates the sequence of amino acids in protein synthesis?

<p>Codons on mRNA (C)</p> Signup and view all the answers

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