For a covalently closed circular double-stranded DNA, the linking number is: . i. equal to the number of helical turns in the DNA double helix.
ii. altered by distorting the shape of the DNA molecule.
iii. an invariant topological property of that DNA molecule.
iv. the number of hydrogen bonds holding the two strands together.

What prevents odyssey from killing the sleeping cyclops

Which of the following will a bacterium produce when a human gene is added to its genome? question 4 options: human carbohydrates a protein made up of both human and bacterial properties the human protein coded for by the human gene human plasmids that can be isolated from the bacterium

Two students are working together on an experiment that measures the effect of different liquid fertilizers on the thickness of plants’ stems. which is most likely to result in the greatest amount of error in their scientific experiment? a.one student measures the plant stem widths by using calipers. the other student measures the widths of the same plant stems again by using a different pair of calipers. b.one student measures the plant stem widths by using calipers. the other student types the measurements as they are taken into a computer spreadsheet. c.one student weighs liquids for the experiment by using a calibrated scale. the other student weighs liquids for the experiment by using a different calibrated scale.