BIOLOGY 1201 EXAM 3 UPDATED ACTUAL
QUESTIONS AND CORRECT ANSWERS
◉ It became apparent to Watson and Crick after completion of
their model that the DNA molecule could carry a vast amount of
hereditary information in which of the following?
Answer: sequence of bases
◉ In E. coli, there is a mutation in a gene called dnaB that alters
the helicase that normally acts at the origin. Which of the
following would you expect as a result of this mutation?
Answer: No replication fork will be formed.
◉ Which of the following statements describes the eukaryotic
chromosome?
Answer: It consists of a single linear molecule of double-stranded
DNA plus proteins.
◉ Which of the following help(s) to hold the DNA strands apart
while they are being replicated?
Answer: single-strand binding proteins
,◉ Cytosine makes up 42% of the nucleotides in a sample of DNA
from an organism. Approximately what percentage of the
nucleotides in this sample will be thymine?
Answer: 8%
◉ Which of the following is true of DNA during interphase?
Answer: It exists as chromatin and is less condensed than mitotic
chromosomes.
◉ What are chromosomes made of?
Answer: DNA and proteins
◉ What are the repetitive DNA sequences present at the ends of
eukaryotic chromosomes called?
Answer: telomeres
◉ In nucleotide excision repair, damaged DNA is excised by what
enzyme(s)?
Answer: nuclease
◉ What process repairs damage to a preexisting double helix?
Answer: nucleotide excision repair
◉ What is the function of helicase in DNA replication?
, Answer: It untwists the double helix and separates the two DNA
strands.
◉ human somatic cells
Answer: divide by mitosis
have a diploid # of chromosomes
are non-reproductive cells
have 46 chromosomes
◉ DNA replication occurs
Answer: during interphase
◉ the mitotic spindle is made up of
Answer: microtubules
◉ In a typical karyotype of any diploid organism, how many
copies of each chromosome are there?
Answer: Four of each - the two homologs and the two sister
chromatids
◉ Which of the following is NOT haploid?
Answer: sporophytes
◉ Synapsis:
QUESTIONS AND CORRECT ANSWERS
◉ It became apparent to Watson and Crick after completion of
their model that the DNA molecule could carry a vast amount of
hereditary information in which of the following?
Answer: sequence of bases
◉ In E. coli, there is a mutation in a gene called dnaB that alters
the helicase that normally acts at the origin. Which of the
following would you expect as a result of this mutation?
Answer: No replication fork will be formed.
◉ Which of the following statements describes the eukaryotic
chromosome?
Answer: It consists of a single linear molecule of double-stranded
DNA plus proteins.
◉ Which of the following help(s) to hold the DNA strands apart
while they are being replicated?
Answer: single-strand binding proteins
,◉ Cytosine makes up 42% of the nucleotides in a sample of DNA
from an organism. Approximately what percentage of the
nucleotides in this sample will be thymine?
Answer: 8%
◉ Which of the following is true of DNA during interphase?
Answer: It exists as chromatin and is less condensed than mitotic
chromosomes.
◉ What are chromosomes made of?
Answer: DNA and proteins
◉ What are the repetitive DNA sequences present at the ends of
eukaryotic chromosomes called?
Answer: telomeres
◉ In nucleotide excision repair, damaged DNA is excised by what
enzyme(s)?
Answer: nuclease
◉ What process repairs damage to a preexisting double helix?
Answer: nucleotide excision repair
◉ What is the function of helicase in DNA replication?
, Answer: It untwists the double helix and separates the two DNA
strands.
◉ human somatic cells
Answer: divide by mitosis
have a diploid # of chromosomes
are non-reproductive cells
have 46 chromosomes
◉ DNA replication occurs
Answer: during interphase
◉ the mitotic spindle is made up of
Answer: microtubules
◉ In a typical karyotype of any diploid organism, how many
copies of each chromosome are there?
Answer: Four of each - the two homologs and the two sister
chromatids
◉ Which of the following is NOT haploid?
Answer: sporophytes
◉ Synapsis:
