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amino acid
发布时间:
2024-06-23 15:29:21
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相关试题
1.
2-aminopropanoic acid is: 选项: A:alanine B:an amino acid with one chiral carbon atom in the molecule C:a neutral amino acid D:a part of proteins and in the human organism occurs as L-amino acid E:CH3-CH-COOH
2.
The enzyme that add a phosphate to an amino acid is phosphatase, and the enzyme that remove a phosphate to an amino acid is protein kinase. 选项: A、正确 B、错误
3.
The amino acid sequence of a protein is very similar in two different species. What is the relationship between the amino acid sequence and the DNA of these two species?
4.
Because the genetic code is nonoverlapping, a missense mutation (from a single nucleotide change) results in the alteration of ______________, and the resulting protein has ______________.() 选项: A、only one codon / at least three amino acid changes B、three codons / a single amino acid change C、only one codon / a single amino acid change D、three codons / three amino acid changes
5.
A ___ mutation in a gene in amino acid biosynthesis pathway permits the bacterium to once again synthesize the amino acid. 选项: A、reversion B、missense C、neutral D、frameshift
6.
Which of the following limits the effect of mutations in a specific gene sequence? 选项: A、 There are two codons for each amino acid B、 Many amino acids have more than one codon. C、 Some codons are shared by more than one amino acid. D、 Each amino acid has only one codon.
7.
The enzymes required to catalyze the combined deamination of amino acids are( )选项: A:D-amino acid oxidase B:Aminotransferase C:L-glutamate dehydrogenase D:glutaminase E:L-amino acid oxidase
8.
A codon is () 选项: A、one
of three nucleotides that encode an amino acid B、three
nucleotides that encode an amino acid C、three
amino acids that encode a nucleotide D、one
of four bases in DNA
9.
Which of the following cannot be converted into glucose?选项: A:Lactic acid; B:Pyruvic acid; C:Glycogenic amino acid; D:Glycerol; E:Fatty acid
10.
Which kind of small molecules are the building blocks of proteins?( ) 选项: A、Glucose B、Nucleotide C、Amino acid D、Pyruvic acid E、Fatty acid
11.
What about inserting a base into the coding region of a gene? 选项: A、No impact B、It will change all amino acid sequences of the protein downstream of the insertion point C、Depending on the insertion point, it may have different effects on the protein D、An amino acid will be inserted into the protein sequence E、Three amino acids will be inserted into the protein sequence
12.
The shape of a protein is specified by its amino acid sequence。( )选项: A:对 B:错
13.
Which one of the following amino acid is involved in the synthesis of nucleotide?( ). 选项:AsparagineGlutamineAlanineD、Lysine
14.
Which of the following statements is correct ( ) 选项: A、A total of 20 different codons represent the genetic code; B、Different codons may encode the same amino acid; C、The third bit of the codon has variability. D、Each nucleotide triplet encodes an amino acid;
15.
A polypeptide with 100 amino acids are synthesized. How many energy molecules of ATP will consumed in the whole process including amino acid activation, attachment, initiation, elongation and termination?
16.
The main component of the extracellular matrix is ( ).选项: A:collagen; B:amino acid; C:glucose; D:water
17.
If a peptide is hydrolyzed under alkaline conditions and D-amino acid products are found, this indicates that the polypeptide originally contained D-amino acids选项: A:正确; B:错误
18.
Genetic engineering manipulates gene products at the level of the选项: A:protein; B:amino acid; C:DNA; D:RNA
19.
(单选题,)Questions 9 and 10 refer to the following patient: A patient with recurrent kidney stones is found to have an inherited amino acid substitution in a transport protein that reabsorbs certain amino acids from the glomerular filtrate so they are not lost in the urine. Which of the following amino acid groups are not reabsorbed from the glomerular filtrate in this disease process? 选项: A:Methionine, B:Cysteine, C:Cysteine, D:Cysteine, E:Methionine,
20.
The characteristics of the leader peptide do not include ( )选项: A:Rich in negatively charged acidic amino acids; B:Low content of hydroxy amino acid; C:Rich in positively charged basic amino acids, and distributed between uncharged amino acids; D:Ability to form amphiphilic (both hydrophilic and hydrophobic) alpha helix structure.
21.
In the protein biosynthesis,tRNAmolecules acts as adapter molecules that recognize both a specific nucleotide sequence and a specific amino acid
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