You are a virologist interested in studying the evolution of viral genomes. you are studying two newly isolated viral strains and have sequenced their genomes. you find that the genome of strain 1 contains 25% a, 55% g, 20% c, and 10% t. you report that you have isolated a virus with a single-stranded dna genome. based on what evidence can you make this conclusion? explain your answer!

a. single-stranded genomes always have a large percentage of purines
b. using the formula: g � a = c + t
c. double-stranded genomes have equal amounts of a and t
d. single-stranded genomes have a higher rate of mutation

The correct answer is option C. "Double-stranded genomes have equal amounts of A and T".

Explanation:

According to Chargaff's rules, double-stranded genomes have equal amounts of guanine and cytosine, and equal amounts of adenine and thymine. This rule comes from the specific base pairing among nucleotides, where in normal conditions guanine only establishes a binding with cytosine and adenine only binds with thymine. Therefore, this rule only applies to double-stranded genomes. Since the viral strains have no equal amounts of guanine and cytosine and equal amounts of adenine and thymine, the viral strains could not be double-stranded but single-stranded.

answer; bodies of water store heat during the day and release it at

answer:

the water molecules are transferred from the roots to the stem or top parts of the tall tree because of important properties of water which are adhesion, cohesion and capillary action. cohesion is the property of water molecules keeps water molecules in a combined state by sharing of bonds between them at the atomic level. adhesion allows the interaction of water molecules with other substances or substrate. adhesion will cause the attachment of water molecules to the wall of the vessel (xylem) of the plant. capillary action occurs when the adhesive force to the vessel wall is stronger than the cohesive force between water molecules. capillary action mimics the transfer of water from a tube or pipe. in this way water utilizes its property to transfer water from down to top level of the plant.