Genetics: Cell Nucleus and DNA Structure

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Questions and Answers

What is the role of DNA ligase in the DNA replication process?

  • Proofreads the replicated DNA
  • Joins small fragments of DNA to form a continuous chain (correct)
  • Removes damaged DNA segments
  • Separates DNA strands to allow replication

Which of the following accurately describes the genetic code redundancy?

  • Different amino acids are coded by identical codons
  • There are multiple codons coding for the same amino acid (correct)
  • Each amino acid is coded by only one codon
  • Codons only code for proteins

What is the main difference between RNA and DNA?

  • RNA is double-stranded while DNA is single-stranded
  • RNA has uracil instead of thymine and DNA uses uracil (correct)
  • DNA has 20 types of nucleotides while RNA has 4
  • RNA does not contain any genetic information

During transcription, what is the role of RNA polymerase in the elongation phase?

<p>Adds RNA nucleotides to the chain (B)</p> Signup and view all the answers

How do frameshift mutations differ from point mutations?

<p>Point mutations involve the insertion or deletion of base pairs (A)</p> Signup and view all the answers

What is the function of tRNA during translation?

<p>Adds amino acids to the peptide chain (D)</p> Signup and view all the answers

Which process results in the synthesis of RNA from a DNA template?

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

How can a missense mutation differ from a nonsense mutation?

<p>Missense mutations lead to premature termination of protein synthesis (D)</p> Signup and view all the answers

Which agent is known to increase the frequency of mutations by altering DNA bases?

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

What is the main method through which gene expression is controlled?

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

What is the primary function of the inner membrane in the nucleus?

<p>To enclose the nucleus and contain the nucleolus (B)</p> Signup and view all the answers

What is the main function of histone proteins in chromosomes?

<p>To fold and coil DNA into chromosomes (C)</p> Signup and view all the answers

What is the name of the enzyme responsible for adding nucleotides to the new DNA strand during DNA replication?

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

What is the name of the small, dense structure within the nucleus that holds RNA, DNA, and DNA-binding proteins?

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

What is the term for the process of DNA wrapping around histone proteins to form a 'beads on a string' appearance?

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

What is the number of chromosome pairs in a human cell?

<p>23 (D)</p> Signup and view all the answers

Which genetic condition is characterized by food-seeking behaviors after infancy and rapid weight gain between 1 and 6 years of age?

<p>Prader-Willi Syndrome (A)</p> Signup and view all the answers

What is a common symptom of Angelman Syndrome?

<p>Developmental Delay (A)</p> Signup and view all the answers

Which genetic condition is characterized by having an unstable CGG repeat on the long arm of the X chromosome?

<p>Fragile X Syndrome (A)</p> Signup and view all the answers

What is a common feature of Genetic Anticipation Disorders?

<p>Triplet Repeat Expansion (A)</p> Signup and view all the answers

Which of the following is a clinical manifestation of Fragile X Syndrome?

<p>Limitations in Speech (A)</p> Signup and view all the answers

Why is the paternal gene in the Prader-Willi critical region unable to function?

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

What causes genetic variability during meiosis?

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

Which disorder is characterized by the presence of two copies of a given chromosome in some gametes?

<p>Down syndrome (A)</p> Signup and view all the answers

In which mode of inheritance are two recessive alleles required to show the disease?

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

What is the key feature associated with Turner syndrome?

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

Which genetic event increases genetic variability?

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

During which phase of the cell cycle does DNA synthesis occur?

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

Which phase of mitosis involves the alignment of chromosomes in the middle of the spindle?

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

What is the most common cause of Down syndrome?

<p>Nondisjunction of oocyte (D)</p> Signup and view all the answers

What is true about haploid cells?

<p>They are gametes (A)</p> Signup and view all the answers

Which law of inheritance states that each reproductive cell carries only one homologous gene?

<p>Mendel's Law of Segregation (A)</p> Signup and view all the answers

What is a common feature in autosomal dominant disorders?

<p>Disease appearing in every generation (C)</p> Signup and view all the answers

Which proteins interact with cell receptors to activate intracellular signaling pathways?

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

Which phenomenon results in the hereditary transmission of one gene having no effect on another gene?

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

What is the purpose of survival factors in cell growth control?

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

Which type of cell contains 23 pairs of chromosomes?

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

What term describes the production of new combinations of genes due to crossing over?

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

Where does spermatogenesis occur?

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

What is the process that yields 4 haploid cells (gametes)?

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

Which event occurs during prophase of mitosis?

<p>First appearance of chromosomes (A)</p> Signup and view all the answers

When does Meiosis II resume in the process of oogenesis?

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

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