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MMSC 491 Quiz 1-4 Questions/Answers
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MMSC 491 Quiz 1-4 Questions/Answers
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MMSC 491 Quiz 1-4 Questions/AnswersWhich is the best definition of noncoding RNA? Correct Ans-A functional RNA that is not
translated to make a protein.
If we take the number of chromosomes in a haploid sperm cell or egg cell to be n and the
total content of genomic DNA to be C, what is the number of chromosomes and the total
genomic DNA content of a diploid G1 phase cell and in a diploid G2 phase cell from the same
organism. Correct Ans-2n chromosomes, DNA content of 2C in G1; 2n chromosomes, DNA
content of 4C in G2.`
Regarding the cell cycle, which, if any, of the following statements is correct? Correct Ans-
The M phase is the only phase in the cell cycle when chromosomes stained with chemical
dyes are visible under the light microscope.
Which of the following statements is incorrect? Correct Ans-The only structural difference
between DNA and RNA strands is that they have different sugars, respectively deoxyribose
and ribose.
Correct Facts:
-Nucleic acids are always negatively charged.
-Cellular DNAs are structured as a double helix.
-Cellular RNAs are single-stranded.
, MMSC 491 Quiz 1-4 Questions/Answers
Which of the following statements is incorrect? Correct Ans-A-T base pairs are stronger
than G-C base pairs.
Correct Facts:
-Purines are nitrogenous bases with a double ring structure.
-Base pairs may form between bases on a single nucleic acid strand.
-Two types of stable base pairing occur in DNA but a third type of base pairing is common in
RNA-RNA and RNA-DNA base pairing.
Which of the following statements is incorrect? Correct Ans-Because centromeres and
telomeres are critically important for chromosome function their DNA has been very highly
conserved during evolution.
Correct Facts:
-Centromeres are important for correct segregation of chromosomes during cell division.
-The DNA of both centromeres and telomeres consist of repetitive DNA sequences.
-The DNA of our chromosomes may have multiple replication origins but their sequences are
not very well conserved.
Which of the following statements is incorrect? Correct Ans-Segregation of mtDNA
molecules into daughter cells needs to be equal.
Correct:
-The copy number of nuclear DNA molecules is tightly controlled
, MMSC 491 Quiz 1-4 Questions/Answers
-Hundreds or thousands of mtDNA molecules are found in human cells.
-The replication of nuclear DNA and mtDNA molecules is not coordinated.
Regarding exons, which, if any, of the following statements is correct? Correct Ans-Some
exons in protein-coding genes consist of noncoding DNA.
Regarding the structures of amino acids, which, if any, of the following statements is
incorrect? Correct Ans-The side chain of an amino acid is based on a branch that contains
one or more carbon atoms
Correct Facts:
-The general formula for a nonionised amino acid is H2N-CH(R)-COOH, that is, a central
carbon atom is linked to an amino group, a carboxyl group, a hydrogen atom, and a side
chain, R.
-The identity of the amino acid is determined by the side chain that is connected to the
central carbon atom.
-Proline is unique in having a side chain that is connected to both the central carbon and also
to the nitrogen atom of the amino group.
Regarding polypeptide structure, which, if any of the following statements is incorrect.
Correct Ans-A polypeptide normally adopts a rod-like conformation, with the side chains
orientated in the same direction relative to the polypeptide backbone.
Correct Facts:
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