Solved by a verified expert:Nucleic
Acid Structure Questions
1)
Explain how
you know the molecule at the right is a nucleic acid.
2)
Is this molecule DNA or RNA? How do you know?
3)
Why are nucleic acids, ‘acids’? In other words, what makes them acidic?
4)
Label the 3’ and 5’ ends of the
molecule below.
5)
Circle a single nucleotide and label
the three components (sugar, phosphate, nitrogenous base)
6)
How many nucleotides make up this
nucleic acid?
7)
Nucleic acids are always constructed
5’ to 3’. In other words, new
nucleotides are always added to the 3’ end.
Put a star showing where the next nucleotide will be added.
8)
Thymine and cytosine are pyrimidine
nitrogenous bases with a single ring.
Thymine has two carbonyl functional groups on its ring system. Cytosine has a carbonyl and amino function
group on its ring. Label these
nitrogenous bases T and C, respectively.
9)
Adenine and guanine are pure
nitrogenous bases with two rings. Adenine has a single amino functional group
on its rings while guanine has a carbonyl functional group and amino
group. Label these nitrogenous bases A
and G, respectively.
10)
Examining the molecules and
functional groups, explain why just two hydrogen bonds will form between A and
T but three form between G and C.
Replication:
The following represents the nucleotide sequence in the gene for a short
polypeptide (protein). The strand shown is the template strand.
3’
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
5’
T
A
C
C
C
T
T
A
A
C
C
A
A
T
G
A
G
T
A
T
T
1.
Replication: Beneath the template
strand above, write the nucleotide sequence for the non-template (anti-sense)
strand of this segment of DNA. Be sure to include the designation for the
3’ and 5’ ends.
2.
During replication of the template
strand, the complementary (non-template) strand would be made from the:
a. right to the
left b. left to the right
3.
If the DNA polymerase/replication fork
moves along the template DNA from the LEFT to the RIGHT replicating the DNA,
the new complementary strand is made in:
a. one long
piece
b. a series of short
fragments
c. impossible to determine
from the info provided
Recent Comments