Which of the Following Statements About Supercoiling of DNA Are

question 20

Multiple Choice

Which of the following statements about supercoiling of DNA are true?
(1) Supercoiled DNA differs in linking number from relaxed DNA.
(2) Supercoiled DNA can be relaxed through the action of topoisomerases.
(3) All DNA in the cell is positively supercoiled.
(4) A negatively supercoiled DNA is more difficult to unwind.

• A) Only 2, 3 and 4 are true
• B) Only 1, 2 and 3 are true
• C) Only 1 and 3 are true
• D) Only 1 and 2 are true
• E) All are true

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Definitions:

Topographic Map

Spatially organized neural representation of the external world.

Sensory Organ

A specialized part of the body that processes input from the environment, such as eyes for vision, ears for hearing, and skin for touch.

Synesthesia

A brain disorder characterized by the automatic and involuntary activation of a secondary sensory or cognitive pathway following stimulation of a different sensory or cognitive pathway.

Pupil

The adjustable opening in the center of the eye through which light passes to reach the retina.