Each codon on mRNA codes for one amino acid. The codons are non-overlapping, and they do not have punctuation between them. Codons are universal, meaning that the same genetic code is used for almost
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相关试题
- 1.Which of the following statements about the characteristics of the genetic code is correct ( )选项： A: The code transmission is continuous, and there is no break or duplication between codons; B:The code is degenerate, one amino acid is encoded by multiple codons; C:Interaction between codon and anticodon; D:The code is universal, and the genetic code is completely consistent in all organism.
- 2.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;
- 3.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;
- 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.What is an open reading frame (ORF)? 选项： A、All of the nucleotides of a gene that are transcribed into mRNA. B、The nucleotides of a gene that make up the codons specifying amino acids. C、The nucleotides of an mRNA molecule before the introns have been removed. D、The amino acid sequence of a polypeptide.
- 6.Genes and their encoded proteins are co-linear; that is, the order of amino acids in proteins is the same as the order of the codons in the RNA and DNA.选项： A:正确; B:错误
- 7.单选题]Figure Q9-27 shows the nucleotide sequence from a protein-coding region of a gene in humans, chimpanzees, and gorillas and the protein sequence produced from this gene. The seventeen amino acids encoded by this DNA are numbered below. The two codons that are not conserved in all three species have been boxed. These two codons code for amino acids 3 and 15.Which of these statements is consistent with these sequence-comparison data? 选项： A:The gorilla sequence is more similar to the chimp sequence than to the human sequence. B:Since these sequences are so similar, this protein must also be found in invertebrates. C:The chimp DNA sequence has likely diverged at the DNA coding for amino acid 15 from the sequence found in the last common ancestor of humans and chimps. D:The last common ancestor of chimps and gorillas most likely used AAA to code for amino acid number 3.
- 8.The words used on a marker shown in Chapter11 can have a small difference from aMarker on your airplane, Chapter 11 uses EXAMPLE to show that there can be a smallInference. An example of this is the difference between the words LAVATORY and TOILET 选项： A: LAVATORY and TOILET have sightly difference ,so they are not allowed to be used as marker on the same airplane at the same time B: Lavatory and TOLET have completely different Meanings and must not be mixed C: The meaning of this paragraph is that different words with the same meaning can be used on one airplane as markers.
- 9.Hand geestures are used all over the world, so they have the same meaning between countries.选项： A:正确; B:错误
- 10. Which of the following is correct about protein synthesis ( ) 选项： A、There are many proteins, enzymes and other biological macromolecules involved in each stage of synthesis. B、Transfer RNA (transfer RNA, tRNA) is the junction between the template and the amino acid. C、Ribosome is a place for protein synthesis. D、mRNA is a template for protein synthesis.
- 11.3.23.2.2 What are the major semantic differences between English and Chinese terms?A term in one language does not necessarily have a ______ in the other language.Terms in two languages that seem to be equivalent but in fact ______ .Things or concepts in one language that have ______ or ______ terms in the other.Terms have the same primary meaning, but have ______ or ______ meanings that differ considerably from each other.
- 12. Which of the following is correct about protein synthesis ( )选项： A:There are many proteins, enzymes and other biological macromolecules involved in each stage of synthesis.; B:Transfer RNA (transfer RNA, tRNA) is the junction between the template and the amino acid.; C:Ribosome is a place for protein synthesis.; D:mRNA is a template for protein synthesis.
- 13.Which one of the following statements about cultural code is TRUE？A．People in the same soc 选项：A、Which one of the following statements about cultural code is TRUE？ A．People in the same society may be governed by different cultural codes.B．Cultural codes are passed on from one generation to another either in written form. or in oral form. or in both.C．Cultural codes in different cultures may differ sharply from one another.D．The influence of cultural codes on an individual may decrease as he becomes older.
- 14.While different words may have the same or similar meaning, the same one word may have more than one meaning. This is what we call ____.
- 15.The words that sound different but have the same or nearly the same meaning are called ______. The relationship between these words is called ______.
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16.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 - 17.Which of the following is NOT true about the meaning of words? 选项： A:There may not always be equivalent concepts from one language to another. B:In Chinese there is no distinction made between the names used to describe one’s brother’s children and of one’s sister’s. C:‘Dog’ has a connotative meaning often related to friendship and loyalty. D:In different cultures the same word may have different connotative meanings.
- 18. Which of the following is NOT TRUE about the meaning of words? 选项： A: There may not always be equivalent concepts from one language to another. B: In Chinese there is no distinction made between the names used to describe one’s brother’s children and of one’s sister’s. C: ‘Dog’ has a connotative meaning often related to friendship and loyalty. D: In different cultures the same word may have different connotative meanings.
