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Work these in your notebook
For the multiple selection questions
write down and explanation
• What does a nucleosome consist of ?
A.
DNA and histones
B.
DNA and chromatin
C.
Chromatin and nucleotides
D.
Mature RNA and histones
• Which base is connected to its complementary base in a base pair by
three hydrogen bonds?
A.
Uracil
B.
Thymine
C.
Guanine
D.
Adenine
• What is the distinction between highly repetitive DNA sequences and
single-copy genes?
A.
The highly repetitive sequences have greater amounts of guanine.
B.
The highly repetitive sequences have greater amounts of cytosine.
C.
The highly repetitive sequences are not transcribed.
D.
The highly repetitive sequences are not replicated.
In the model of the DNA molecule
shown below, which arrows point to
covalent bonds?
A.
B.
C.
D.
I, II and III only
II, III and IV only
I, III and IV only
I, II and IV only
Outline the structure of nucleosomes. (2)
(eight) histone (proteins);
DNA wrapped around histones/nucleosome;
further histone holding these together;
Do not allow histone wrapped around DNA.
Most of the DNA of a human cell is contained in the nucleus.
Distinguish between unique and highly repetitive sequences in
nuclear DNA.
(5)
(b) Outline transcription in prokaryotes. [6]