Hydrogen bonds are not as strong as ionic or covalent bonds, but they are able to hold the DNA double helix together because
A) there are so many of them.
B) the hydrogen bonds in DNA differ from hydrogen bonds in other molecules.
C) the hydrogen bonds in DNA also have a very special type of molecular glue.
D) ten of them form between each DNA base pair.
A) there are so many of them.
You might also like to view...
The female gametophyte is the ____
a. pollen b. ovule c. embryo sac d. endosperm e. ovary
Two species that interact closely for generations through symbiosis often _______________, regardless of whether one species helps or harms another. Each species acts as a selective agent that shifts the range of variation in the other
Fill in the blank(s) with correct word
Distinguish between a gene tree and a species tree
What will be an ideal response?
Bacterial cells can take up the amino acid tryptophan from their surroundings, or, if the external supply is insufficient, they can synthesize tryptophan by using enzymes in the cell
In some bacteria, the control of glutamine synthesis is similar to that of tryptophan synthesis, such that the glutamine repressor inhibits the transcription of the glutamine operon, which contains the genes that code for the enzymes required for glutamine synthesis. On binding to cellular glutamine, the glutamine repressor binds to a site in the promoter of the operon. A. Why is glutamine-dependent binding to the operon a useful property for the glutamine repressor? B. What would you expect to happen to the regulation of the enzymes that synthesize glutamine in cells expressing a mutant form of the glutamine repressor that cannot bind to DNA? C. What would you expect to happen to the regulation of the enzymes that synthesize glutamine in cells expressing a mutant form of the glutamine repressor that binds to DNA even when no glutamine is bound to it?