Who's X-ray work aided Watson and Crick in their discovery of the double helix? L. Pauling R. Franklin W.H. Bragg Leaderberg TRUE ANSWER : ? YOUR ANSWER : ?
Which of these drugs bind to DNA and cuts it, producing hydroxyl radicals? Bleomycin Erythromycin All of these Tunicamycin TRUE ANSWER : ? YOUR ANSWER : ?
One hypothesis of DNA replication suggested that the parental DNA molecules are broken into fragments. Both strands of DNA in each of the daughter molecules are made up of an assortment of parental and new DNA. This statement refers to which hypothesis? Conservative theory Semi-conservative theory Evolutionary theory Dispersive theory TRUE ANSWER : ? YOUR ANSWER : ?
In sperm heads, DNA is particularly highly condensed and the histones are replaced with small basic protein called pyrimidines protamines All of these purines TRUE ANSWER : ? YOUR ANSWER : ?
What is the range of melting point temperatures (Tm) for most DNA molecules? 50 to 60°C 60 to 80°C 70 to 90°C 80 to l00°C TRUE ANSWER : ? YOUR ANSWER : ?
There is a single origin for DNA replication in bacteria. How many origins of replication are found in the much larger genomes of eukaryotes such as mammals? About 100 none of these Thousands and tens of thousands One TRUE ANSWER : ? YOUR ANSWER : ?
DNAs when charged, migrate in a gel towards the none of these negative pole positive pole will not migrate TRUE ANSWER : ? YOUR ANSWER : ?
What does ligase do during replication of DNA? Joins nicks in DNA strands Digests mRNA when it is no longer needed Synthesizes the lagging strand Makes copies of mRNA from DNA TRUE ANSWER : ? YOUR ANSWER : ?
When DNA polymerase is in contact with guanine in the parental strand, what does it add to the growing daughter strand? Guanine Phosphate Cytosine Uracil TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following species lack a 'classical' histone H1? Arabidopsis thaliana Xenopus laevis Strongylocentrotus purpuratus Saccharomyces cerevisiae TRUE ANSWER : ? YOUR ANSWER : ?