Complete the following sentences about dna topology by moving the appropriate terms to their descriptions. is the coiling, or looping, of the double helix around its axis. which results from the partial unwinding (right-handed winding or underwinding) of the double helix represents the topology of dna in vivo and permits easier strand separation is the winding of the two dna strands around each other permits dna to maintain a relatively stable conformation when the helix is slightly underwound or overwound. results from the overwinding of the dna double helix. writhe twist positive supercoiling supercoiling negative supercoiling

a. a clone will be physically identical to the original, but won’t be genetically identical

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in the given question, the partial pressure is calculated by using the ideal gas equation, that is, pv = nrt

here, p is pressure, v is volume = 25 l, n is number of moles = 0.0104 moles, r is gas constant = -0.0821 l.atm / mol.k

t is temperature = 273 k

p = nrt / v

p = (0.0104 mol × 0.0821 l.atm / mol.k × 273 k) / 25 l

= 0.0093 atm

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.