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以下电路中,加以适当辅助门电路,( )适于实现单输出组合逻辑电路。

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管理组织是保证管理目标实现的重要手段,下面不属于常用的管理组织形式的是( )。

A. U
B. H
C. M
D. A

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Inasampleofdouble -stranded DNA, 30%ofthe nitrogenous basesarethymine (T). WhatpercentageofthebasesareGuanine(G)?

A. 20%
B. 30%
C. 40%
D. 60%

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HowdidtheAvery-MacLeod-McCartyexperimentexpandonFrederickGriffith'sobservations?

A. ItsuggestedthatDNAisthe“transformingprinciple."
B. ItconfirmedthatDNAisadoublehelixcomposedoftwoantiparallelstrands.
C. ItdemonstratedthatDNAconsistsoffournucleotideswheretheproportionsofadenine/thymineandcytosine/guanineremainconstant.
D. ItprovedthatDNAissemiconservativelyreplicated.

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Whichofthefollowingstatementsistrueregardingthediscoveryofthedoublehelix?

A. RosalindFranklin’sx-raycrystallographyprovidedWatsonandCrickwithimportantdatathathelpeddeterminethestructureofDNA.
B. JamesWatson,FrancisCrick,MauriceWilkins,andRosalindFranklinwereawardedtheNobelPrizeinMedicinefortheirdiscoveryofthedoublehelix.
C. TheexperimentsthatledtothediscoveryofthedoublehelixultimatelydisprovedChargaff'srulesregardingnitrogenousbases.
D. Itwasdiscoveredthatdouble-strandedDNAisaparallelmolecule.

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