You analyze a dna sample and find that its base composition is 30% a, 20% t, 30% g, and 20% c. what can you conclude about the structure of this dna?
because a equals g, and t equals c, this must be a double-stranded dna molecule.
because a does not equal t, and g does not equal c, this cannot be a double-stranded dna molecule. it must therefore be a single-stranded dna.
because a is half as much again as t, and g is half as much again as c, this must be a mutated double-stranded dna molecule.
there is not enough information to determine whether it is a single-stranded or a double-stranded dna molecule.

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.