Quiz 1 review Flashcards
Transfer of sequence information from RNA to protein is irreversible whereas sequence information in the form of RNA and DNA can be transferred (RNA to DNA and DNA to RNA)
True
Purines have what kind of structure?
Two cyclic molecules together, one 8 membered ring and one 5 membered ring.
If a sequence of nucleotides is 27 base pairs long and it is said to have a colinear relationship with the corresponding polypeptide, how many amino acids will be in this peptide? (Assuming all nucleotides code for an amino acid and that this is a bacterial system)
9
What is a major difference between a gene in bacteria and a gene in a eukaryote?
eukaryotic genes contain exons and frequently introns
Eukaryotic nuclear chromosomes, by mass, have roughly equivalent amounts of DNA and protein.
True
In eukaryotes the exons contained in an mRNA are always translated.
False
What is the result of the insertion or deletion of a single base in the coding sequence?
frameshift
Which DNA sequence would have the highest melting temperature and why?
5’ G G C G T G C A T C G 3’
| | | | | | | | | | |
3’ C C G C A C G T A G C 5’
Most G-C bonds
What would you expect if purines paired with purines and pyrimidines paired with pyrimidines, in terms of DNA double helix structure?
The double helix would have thin and thick areas instead of a constant width
What is the genetic material of all known organisms and viruses?
always nucleic acid
Some bacteria are referred to as “extremophiles” because they thrive at extremely high temperatures or other inhospitable environments. What might you predict about the nitrogenous base composition of a bacteria speices that lives in extremely high temperature compared to a bacteria species that thrives at room temperature?
The nitrogen bases would consist mostly of Cytosine and Guanine, due to the higher melting point.
Hershey and Chase tracked DNA during phage infection using a radioisotope of:
phosphorus
What feature distinguishes a nucleotide from a nucleoside?
presence of a 5’ phosphate
A chromosome is best defined as
a linear array of genes
DNA is a protein
False
