知到答案生物化学（英文版）智慧树答案_2022年

第二章

Tm is directly related to the GC content of DNA and ionic strength.
答案:对
rRNA is the site for protein biosynthesis.
答案:错
In a DNA molecule, if the molar ratio of A is 17.2%, the molar ratio of C should be ( )
65.6％
50.3%
17.2％
67.2％
答案:32.8％
The key part of DNA molecule to store and transmit genetic information is ( )
pentose phosphate skeleton
phosphate diester bond
base rotation angle
Pentose conformation
答案:base sequence
The force to maintain the lateral stability of DNA double helix is ( )
Internal screw drainage
phosphodiester bond
hydrogen bond between base pairs
disulfide bond
答案:hydrogen bond between base pairs
What's wrong with nucleic acid hybridization ( )
Using molecular hybridization, the target gene can be fished from gene library
DNA single strand can hybridize with RNA strand with almost the same complementary base
Two single stranded DNA from different sources can be hybridized as long as some bases are complementary
RNA DNA hybrid chain can be synthesized by reverse transcription using mRNA as template
答案:mRNA can be hybridized with the encoded polypeptide chain
The changes in DNA denaturation are: ( )
hyperchromic effect
Viscosity increase
Hydrogen chain breaking and double helix structure breaking between chains
答案:hyperchromic effect;Hydrogen chain breaking and double helix structure breaking between chains
The histones that make up the core particle of nucleosome are ( )
H₂A
H₂B
H₄
H₁
答案:H3;H2A;H2B;H4
As for the description of rRNA, it is correct to ( )
It's the most abundant RNA in the cell
Large and small subunits that can combine with proteins to form ribosomes
Containing more rare bases
Shortest half-life
答案:It's the most abundant RNA in the cell;Large and small subunits that can combine with proteins to form ribosomes
The biological functions of nucleotides in vivo include ( )
As cytoskeleton
Raw materials for nucleic acid synthesis in vivo
Some nucleotides are the direct energy suppliers in the organism
Some nucleotides are allosteric effectors of allosteric enzymes
答案:Some nucleotides can be used as second messengers of hormones;Raw materials for nucleic acid synthesis in vivo;Some nucleotides are the direct energy suppliers in the organism;Some nucleotides are allosteric effectors of allosteric enzymes