Which of the following structure causes the UV absorption of nucleic acids:____
A. The hydrogen bond between purine and pyrimidine
B. The glycosidic bond between base and pentose
C. The phosphoester bond between pentose and phosphate
D. The conjugated double bond between purine and pyrimidine ring
E. The phosphodiester bond between nucleotides
查看答案
What is the direction of genetic information flow of reverse transcription:____
A. DNA→DNA
B. DNA→RNA
C. RNA→DNA
DNA→protein
E. RNA→RNA
What are the basic components of a nucleic acid:____
A. phosphate and ribose
B. nucleoside and nitrogenous base
C. mononucleotide
D. nitrogenous base
E. deoxynucleoside and base
Which of the following may cause non-specific amplification of DNA in PCR reaction?()
A. excessive TaqDNA polymerase
B. excessive primer
C. excessive Mg2+in buffer
D. either of A, B or C
Which of the following enzymes can tolerant high temperature:()
A. Taq DNA polymerase
B. HindIII
C. T4 ligase
D. RNA enzyme
E. Klenow segment
微信支付 
支付宝支付