GENETICS AND EVOLUTION
MOLECULAR BASIS OF INHERITANCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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both positive
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both positive
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negative and positive, respectively
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zero.
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Detailed explanation-1: -Histones carry positive charge, because they have an abundance of basic proteins arginine and lysine. The negatively charged DNA is wrapped around positively charged histone resulting in a net positive and negative charge.
Detailed explanation-2: -So, the correct answer is ‘Negative and positive, respectively’.
Detailed explanation-3: -Histones are basic proteins, and their positive charges allow them to associate with DNA, which is negatively charged. Some histones function as spools for the thread-like DNA to wrap around. Under the microscope in its extended form, chromatin looks like beads on a string. The beads are called nucleosomes.
Detailed explanation-4: -DNA is negatively charged due to the presence of phosphate backbone.
Detailed explanation-5: -DNA is negatively charged, therefore, when an electric current is applied to the gel, DNA will migrate towards the positively charged electrode. Shorter strands of DNA move more quickly through the gel than longer strands resulting in the fragments being arranged in order of size.