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If a cell were unable to produce histone proteins, which of the following results would be a likely effect on the cell?
a] The cell's DNA could not be packed into its nucleus.
b] Amplification of other genes would compensate for the lack of histones.
c] There would be an increase in the amount of DNA produced during replication.
d] Spindle fibers would not form during prophase.
a
Which of the following statements correctly describes the structure of chromatin?
a] Heterochromatin is composed of DNA, whereas euchromatin is made of DNA and RNA.
b] Heterochromatin is highly condensed, whereas euchromatin is less compact.
c] Both heterochromatin and euchromatin are found in the cytoplasm.
d] Euchromatin is not transcribed, whereas heterochromatin is transcribed.
b
Which of the following structural characteristics is most critical for the association between histones and DNA?
a] There are at least five different histone proteins in every eukaryote.
b] Histones are highly conserved [that is, histones are very similar in every eukaryote].
c] Histones are positively charged.
d] Histones are small proteins.
c
Which of the following statements accurately describes the structure of a eukaryotic chromosome?
a] It has different numbers of genes in different cell types of an organism.
b] It is constructed as a series of nucleosomes wrapped around two DNA molecules.
c] It is composed of a single strand of DNA.
d] It is a single linear molecule of double-stranded DNA plus proteins.
d
Which of the following molecular characteristics cause histones to bind tightly to DNA?
a] Histones are positively charged, and DNA is negatively charged.
b] Histones are covalently linked to the DNA.
c] Histones are negatively charged, and DNA is positively charged.
d] Both histones and DNA are strongly hydrophobic.
a
Which of the following lists represents the order of increasingly higher levels of organization of
chromatin?
a] nucleosome, 30-nm chromatin fiber, looped domain
b] looped domain, 30-nm chromatin fiber, nucleosome
c] nucleosome, looped domain, 30-nm chromatin fiber
d] 30-nm chromatin fiber, nucleosome, looped domain
a
What are chromosomes made of?
a] DNA
b] DNA, heterochromatin, and histone proteins
c] DNA, RNA, and proteins
d] DNA and euchromatin
e] DNA and
proteins
e