Below is a double stranded DNA composed of one strand containing ...

[ahriuashd]

Question 1

At the isoelectric point, an amino acid has what charges?
◦ + and -
◦ none
◦ + only
◦ - only
◦ multiple charges

Question 2

Below is a double stranded DNA composed of one strand containing ¹⁵N atoms and the other strand containing ¹⁴N atoms. If the cell which contains this DNA is grown for one generation (replication) on ¹⁵N medium and then transferred to ¹⁴N media for a second generation, what would the resulting double stranded DNA molecules look like?



◦ Four molecules; each containing one ¹⁴N strand and one ¹⁵N strand.
◦ Two molecules; one with a ¹⁵N and a ¹⁴N strand, the other with two ¹⁴N strands.
◦ Four molecules; three containing one ¹⁴N strand and one ¹⁵N strand and one molecule with two ¹⁴N strands.
◦ Four molecules; one with two ¹⁵N strands, two molecules with two ¹⁴N strands, and one molecule with one ¹⁴N and one ¹⁵N strands.
◦ Four molecules; all molecules have ¹⁴N strands.

[katheyjon]

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[ahriuashd]

Thanks for the timely response, appreciate it

[nathang24]

Excellent