| List-I | List-II |
| A. Histones | III. Positively charged basic proteins |
| B. Nucleosome | IV. DNA wrapped around histone octamer |
| C. Euchromatin | I. Loosely packed chromatin |
| D. Heterochromatin | II. Densely packed Chromatin |
The correct matches are:
A. Histones - III. Positively charged basic proteins: Histones are positively charged proteins that are crucial for DNA packaging in eukaryotes.
B. Nucleosome - IV. DNA wrapped around histone octamer: A nucleosome is the basic structural unit of chromatin, consisting of DNA wrapped around a histone octamer.
C. Euchromatin - I. Loosely packed chromatin: Euchromatin is the less condensed form of chromatin, which is transcriptionally active.
D. Heterochromatin - II. Densely packed chromatin: Heterochromatin is the highly condensed form of chromatin, which is transcriptionally inactive.
Therefore, the correct option is (4): A-III, B-IV, C-I, D-II.

A constant voltage of 50 V is maintained between the points A and B of the circuit shown in the figure. The current through the branch CD of the circuit is :
The output (Y) of the given logic implementation is similar to the output of an/a …………. gate.
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In the above represented plasmid an alien piece of DNA is inserted at the EcoRI site. Which of the following strategies will be chosen to select the recombinant colonies?