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Tuesday, December 24, 2013

Video Tutor Session Quiz: DNA Structure


Part A
Correct
In this model, the deoxyribose sugar is the blue five-sided structure at the center.
Part B
Correct
A polynucleotide contains a sugar/phosphate backbone, where the sugar of one nucleotide binds to the phosphate of the next, and so on.
Part C
Correct
Remember the base pairing rules: A goes with T, and G goes with C. So the sequence GCAC matches with the sequence CGTG.
Part D
Correct
There are four kinds of DNA nucleotides, abbreviated A, T, C, and G.
Part E
Correct
The sugar and phosphate groups are the same for all DNA nucleotides. The base is the one part that changes.

DNA Packing

Part A
Correct
This is a decondensed DNA double helix.
Part B
Correct
RNA polymerase attaches to DNA.
Part C
Correct
These are histone proteins.
Part D
Correct
This is an image of supercoils.
Part E
Correct
This is an image of loops.

DNA Replication: A Closer Look

Part A
Correct
This is referred to as specific base pairing.
Part B
Correct
DNA replication is semiconservative.
Part C
Correct
The first step of DNA replication is unwinding the DNA double helix.
Part D
Correct
A replication fork is the transition region between paired and unpaired DNA strands.
Part E
Correct
Since DNA polymerase can assemble DNA only in the 5' to 3' direction, the new strand complementary to the 3' to 5' strand must be assembled in short 5' to 3' segments, which are later joined together by ligase.
Part F
Correct
The synthesis of a DNA strand begins with the formation of an RNA primer.
Part G
Correct
An old DNA strand is used as a template for the synthesis of a complementary new strand.

DNA Replication: A Review

Part A

Correct
Ligase joins DNA segments into a continuous strand.
Part B

Correct
DNA replication is semiconservative.
Part C

Correct
The first step of DNA replication is unwinding the DNA double helix.
Part D

Correct
A replication fork is the transition region between paired and unpaired DNA strands.
Part E

Correct
Since DNA polymerase can assemble DNA only in the 5' to 3' direction, the new strand complementary to the 3' to 5' strand must be assembled in short 5' to 3' segments, which are later joined together by ligase.
Part F

Correct
The synthesis of a DNA strand begins with the formation of an RNA primer.
Part G

Question #23

Correct
Primase catalyzes the formation of an RNA primer.
Part H

Correct
An old DNA strand is used as a template for the synthesis of a complementary new strand.