Human Biology Exam Quiz!

49 Questions | Total Attempts: 99

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Human Biology Exam Quiz!

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Questions and Answers
  • 1. 
    In a cell undergoing cellular reproduction which of the following stages have no chromatids?
    • A. 

      Prophase

    • B. 

      Anaphase

    • C. 

      Metaphase

    • D. 

      Telophase

  • 2. 
    Which portion of the meiotic cell division directly follows telophase and cytokinesis of the first cell division?
    • A. 

      Replication of DNA

    • B. 

      G2

    • C. 

      S Phase

    • D. 

      Prophase of the next division

  • 3. 
    If a cell is to undergo mitosis which of the following is not true?
    • A. 

      Both members of a chromosome pair will be replicated.

    • B. 

      Both members of a chromosome pair will attach to the spindle.

    • C. 

      The mother cell will end up with four times the amount of DNA after Interphase has occurred.

    • D. 

      There is only one Interphase in each cell reproductive cycle.

  • 4. 
    In cellular reproduction, if one sees the chromosomes of a cell aligned at the center of the cell in a straight line, this cell may:
    • A. 

      Be considered a diploid cell.

    • B. 

      Be in the G1 phase of cellular reproduction.

    • C. 

      Be in either the G1 and G2 phases of cellular reproduction.

    • D. 

      Have moved directly into anaphase from prophase.

  • 5. 
    The purpose of anaphase is to:
    • A. 

      Eliminate one chromosome of each pair.

    • B. 

      Cause the cell to grow before cytokinesis.

    • C. 

      Allow separation of the chromatids of each chromosomes.

    • D. 

      Make more DNA before telophase.

  • 6. 
    If one has the following sequence of bases, what will be the nucleotide base which one would predict to correctly replace the X? A A A G G G G C C C C  T T T AT  T T  C C C C G G G G A A A X
    • A. 

      C, because there cannot be four A's in a row.

    • B. 

      It is not possible to predict what will occur at X.

    • C. 

      U, because RNA is being produced.

    • D. 

      T, because this is DNA.

  • 7. 
    If one has the following sequence of DNA bases, what will be the sequence of RNA which is made from this sequence? A A G C G T T G A C A
    • A. 

      U U C G C A A C U G U

    • B. 

      U U C G C U U C U G U

    • C. 

      T T C G C U U C U G U

    • D. 

      U U G C G U U C U G U

  • 8. 
    Which is true of the structure of DNA? [In the following, P = PHOSPHATE; S = THE CORRECT DNA 5 CARBON SUGAR]
    • A. 

      Bonds between the P's of the two backbones hold the two DNA strands together.

    • B. 

      Each sugar phosphate backbone (rails of the ladder) has the following structure: P - P - S - P - P - S - P - P - S - P - P - S - P - P

    • C. 

      A nitrogenous base (A, C, G, or T) is attached to the S of the backbones.

    • D. 

      Purines are found in only one strand of the DNA molecule because of the shape of purines.

  • 9. 
    In a normal piece of DNA which has 20 complementary nitrogenous base pairs, the highest number of purine nucleotides which could be found in one of the strands is:
    • A. 

      6

    • B. 

      8

    • C. 

      10

    • D. 

      20

  • 10. 
    In a molecule of DNA, one would find that:
    • A. 

      Every purine is shaped as a single ring.

    • B. 

      Every purine of one strand is hydrogen bonded to a pyrimidine of the other strand.

    • C. 

      The two strands are held together by three hydrogen bonds between each of the bases of a base pair.

    • D. 

      DNA is allowed to have purine-purine base pairs if they come next to a pyrimidine-pyrimidine base pair.

  • 11. 
    If a parent cell (assume 1 pair of chromosomes) is to undergo normal mitosis, then each of the daughter cells will have:
    • A. 

      1 pair of chromosomes

    • B. 

      1 chromosome

    • C. 

      4 DNA molecules

    • D. 

      2 chromatids

  • 12. 
    If a parent cell (assume 1 pair of chromosomes) is to undergo normal meiosis, then each of the final daughter cells will have:
    • A. 

      1 pair of chromosomes

    • B. 

      1 chromosome

    • C. 

      2 DNA molecules

    • D. 

      1 chromatid

  • 13. 
    If a parent cell (assume 1 pair of chromosomes) is to undergo normal meiosis and produces an egg, then the final, functional, unfertilized egg will contain:
    • A. 

      1 pair of chromosomes

    • B. 

      1 chromosome with 2 chromatids

    • C. 

      1 chromosome

    • D. 

      A small polar body instead of chromosome(s)

  • 14. 
    Which of the following is a characteristic of normal meiosis?
    • A. 

      Meiosis produces only gametes.

    • B. 

      Any body cell can undergo meiosis.

    • C. 

      DNA undergoes replication twice, once before the first division and once before the second division.

    • D. 

      After the first division, the two daughter cells are still diploid.

  • 15. 
    A human male has both an X and a Y sex chromosome. Therefore sperm formed by a human male:
    • A. 

      Will contain both an X and a Y in the same sperm. Whichever chromosome is used from this type of sperm will determine the sex of the offspring.

    • B. 

      May contain either an X or a Y but not both.

    • C. 

      Contain only a Y because the sons will all get the Y.

    • D. 

      Will become a polar body if it contains an X.

  • 16. 
    What is a codon?
    • A. 

      A codon is three nitrogenous bases in a row of a DNA molecule.

    • B. 

      A codon is three nitrogenous bases in a row at the end of a tRNA molecule.

    • C. 

      A codon is three amino acids in a row in a protein.

    • D. 

      A codon is three nitrogenous bases in a row of an RNA molecule.

  • 17. 
    Which codon is called the START codon?
    • A. 

      The first nitrogenous base triplet AUG of an mRNA molecule.

    • B. 

      The nitrogenous bases ABC.

    • C. 

      The first exon in a mRNA molecule.

    • D. 

      The first nitrogenous base A of an mRNA molecule.

  • 18. 
    What are introns?
    • A. 

      Exons are really tRNA before the anti-codon is added.

    • B. 

      Introns are the portions of RNA that are saved, or included, to form the final mRNA molecule.

    • C. 

      An Intron is also called a codon. The two are the same thing.

    • D. 

      Introns are the portion(s) of RNA that are removed, or excluded, from the final mRNA molecule.

  • 19. 
    Which is the true statement?
    • A. 

      All codons code for an amino acid.

    • B. 

      The first three amino acids. when synthesizing a protein, are always Methionine-glycine-glycine.

    • C. 

      The first amino acid, when synthesizing a protein is always methionine.

    • D. 

      An amino acid will have only one codon which codes for it.

  • 20. 
    If a human cell has 23 pair of chromosomes, one would say that it:
    • A. 

      Will undergo meiosis.

    • B. 

      Is a gamete in which non-disjunction of chromosome 23 has occurred.

    • C. 

      Is probably from a woman.

    • D. 

      Could be a fertilized egg.

  • 21. 
    Which of the following crosses would result in a phenotypic ratio of 1 dominant and 1 recessive?
    • A. 

      AA x aa

    • B. 

      Aa x AA

    • C. 

      Aa x Aa

    • D. 

      Aa x Aa

  • 22. 
    In the cross, AaBb x AaBb, which gamete would NOT be formed?
    • A. 

      AA

    • B. 

      Ab

    • C. 

      AB

    • D. 

      Ab

  • 23. 
    Which of the following crosses could produce a child with the type AB blood as well as a child with type O blood?
    • A. 

      IAIB x ii

    • B. 

      IAIa x IbIb

    • C. 

      IAi x IBi

    • D. 

      IAIB x IAIB

  • 24. 
    What proportion of homozygous genotypes could occur from the cross Aa x Aa?
    • A. 

      1/4

    • B. 

      2/4

    • C. 

      3/4

    • D. 

      9/16

  • 25. 
    The following genes R and r show incomplete dominance. Which of the following crosses would show three phenotypes?
    • A. 

      RR x rr

    • B. 

      RR x Rr

    • C. 

      Rr x Rr

    • D. 

      RR x RR x rr

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