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Describe and explain the possible effect on your results if the following experimental errors or variations, in each case specifying the component(s) whose percentages would be too high or too low if:

a) After adding dichloromethane to Panacetin, you didn't stir the mixture long enough.

b) During the NaOH extraction you failed to mix the aqueous and organic layers thoroughly.

c) You mistakenly extracted the dichloromethane solution with 1M HCL rather than 1M NaOH.

d) Instead of using pH paper, you acidify the NaOH solution using litmus paper.

A thin lens has a focal length f in air. If you now make a lens of identical shape, using glass having twice the refractive index of the original glass, the focal length of the new lens will be

A) f/2

B) less than f/2

C) 2f

D) greater than 2f

I think the answer is C) 2f but I'm not 100% sure...

Consider a system of two positive electric charges 1 µC and 4 µC placed at a distance of 10 cm. What is the potential difference between points a and b.

Two positive charges are separated by a distance of 12 cm. At a point on the line joining them, at a distance of 3 cm from the first charge, the electric field is zero. If the first charge has a magnitude of 2 µC, what is the magnitude of the second charge?

Consider a system of two positive electric charges 1µC and 4µC placed at a distance of 10 cm. Where one has to place a prove charge such that the net force acting on it is zero?

Recessive embryo-lethal mutants of Arabidopsis are generally maintained as heterozygotes that produce 25% aborted seeds following self pollination. What percentage of F1 progeny seeds should have a normal phenotype following a cross between two allelic heterozygotes?

2. Which of the following typically occur during RNA processing in eukaryotes: (A) Addition of the methyl G cap; (B) Ligation of adjacent exons to form mature mRNAs; (C) Binding of codons to anticodons; (D) Addition of the 3’ UTR; (E) Association of hnRNA with the ribosome;

(F) Removal of introns from hnRNAs. Include all correct answers

I know A is correct but do not know if any of the others are...