BSC 118 Chapter 16 MyLabsPlus
Cytosine makes up 38% of the nucleotides in a sample of DNA from an organism. Approximately what percentage of the nucleotides in this sample will be thymine?
12%
What is meant by the description "antiparallel" regarding the strands that make up DNA?
The 5' to 3' direction of one strand runs counter to the 5' to 3' direction of the other strand.
Daughter DNA
after replication is complete, the new DNA called _____, are identical to each other
okazaki fragments
are the short sections of DNA that are synthesized on the lagging strand of the replicating DNA
replication fork
during DNA replication, an open section of DNA, in which a DNA polymerase can replicate DNA
As DNA replication continues and the replication bubble expands, the parental double helix is unwound and separated into its two component strands. This unwinding and separating of the DNA requires three different types of proteins: helicase, topoisomerase, and single-strand binding proteins. Sort the phrases into the appropriate bins depending on which protein they describe.
helicase: binds at the replication fork, breaks H-bonds between bases topoisomerase: binds ahead of the replication fork, breaks covalent bonds in DNA back bone single-strand binding protein: binds after the replication fork, prevents H-bonds between bases
What kind of chemical bond is found between paired bases of the DNA double helix?
hydrogen
The chemical structure of DNA and its nucleotides The DNA double helix is composed of two strands of DNA; each strand is a polymer of DNA nucleotides. Each nucleotide consists of a sugar, a phosphate group, and one of four nitrogenous bases. The structure and orientation of the two strands are important to understanding DNA replication. Drag the labels to their appropriate locations on the diagram below. Pink labels can be used more than once.
look at this on hw
DNA polymerase
the enyzme that can replicate DNA
Leading strand
the new DNA strand that grows continuously in the 5' to 3' direction
What determines the nucleotide sequence of the newly synthesized strand during DNA replication?
the nucleotide sequence of the template strand
