Another application of the polymerase chain reaction (pcr) is to screen samples for the presence of viruses. for example, do you remember the ebola outbreak? a blood sample can be sent for pcr based analysis. in this instance, many copies of viral specific dna sequences are made to cross a detection threshold. each ebola virus is composed of a single strand of rna approximately 18,950 nucleotides long enclosed in a cylindrical viral envelope. in some laboratories, the first step might be to incubate the samples with the enzyme reverse transcriptase. why might this be?

Models are non-visual ways of coummincating how someone thinks about something in the natural world

The rapid decomposition of organic matter produces evidence which supports: the slow accumulation of coal deposits long ages of the earth rapid burial of vast amounts of vegetation biblical account of noah's flood

To store strawberries in sugar syrup, lucy placed them in a jar and covered them with sugar but did not add any water. do you think syrup will be formed? justify. a. no. since water is not added, there cannot be any syrup formation. b. no. the higher concentration of sugar on the outside will cause the water from the sugar to diffuse in the strawberry cells causing them to swell without formation of any syrup. c. yes. the higher concentration of sugar on the outside will cause the water from the strawberry to diffuse out resulting in syrup formation. d. yes. the sugar will melt over time and form the syrup.