36. Which of the following helps stabilize mRNA by inhibiting its degradation?

(A)TATA box

(B)spliceosomes

(C)5ʹ cap and poly ( A ) tail

(D)introns

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統計： 尚無統計資料

相關試題

22. Which of the following helps to stabilize mRNA by inhibiting its degradation? (A) TATA box (B) Spliceosomes (C) 5' cap (D) poly-A tail (E) both C and D

37. What is the activated reactant in the biosynthesis of phosphoribosylamine?(A)ATP (Adenosine triphosphate)(B)IMP (Inosine monophosphate)(C)PRPP (5-Phosphoribosyl-1-pyrophosphate)(D)FAD (Flavin adenine dinucleotide)

38. During DNA replication in eukaryotic cells, the enzyme responsible for synthesizing the new DNA strand in the 5' to 3' direction is:(A)DNA ligase(B)DNA polymerase α(C)DNA polymerase δ(D)RNA primase

39. Regarding telomerase, which statement is correct?(A)Telomerase is responsible for DNA repair.(B)Telomerase increases the number of DNA molecules in cells after each cell division.(C)Telomerase is primarily found in prokaryotes.(D)The main function of telomerase is to cleave DNA molecules.

40. Which of the following statements about prokaryotic and eukaryotic mRNA is incorrect?(A)Prokaryotic and eukaryotic mRNAs are polycistronic.(B)Translation of prokaryotic mRNAs can begin even before transcription is completed.(C)Eukaryotic RNAs undergo significant posttranscriptional processing.(D)The 5' end of all eukaryotic mRNAs is capped with a unique 5'-5' linkage to a 7- methylguanosine residue.

41. Regarding RNA splicing, which statement is correct?(A)RNA splicing occurs during translation.(B)RNA splicing separates the RNA transcript into exons and introns.(C)RNA splicing only occurs in eukaryotes.(D)The primary function of RNA splicing is the synthesis of tRNA.

42. Which of the following statements regarding restriction endonuclease is true?(A)Bacteria use them to cause DNA cleavage and to inactivate the DNA of invaders.(B)Most widely used in molecular biology are type II restriction endonuclease.(C)Type I Restriction endonuclease has methyltransferase activity.(D)All of the above.

1. The disulfide bond is a covalent linkage formed between two cysteine residues in proximity under an oxidative environment. In eukaryotic cells, disulfide bonds can be formed only in:(A)The cytosol;(B)Endoplasmic reticulum;(C)Endosomes;(D)Mitochondria.

2. Ferroptosis is a type of programmed cell death. Which of the following is NOT the feature of ferroptosis:(A)Caspase activation;(B)Increased oxidative stress;(C)Iron-dependent;(D)Inhibition of cystine/glutamate transporter.

3. All of the following molecular features are present in both prokaryotic and eukaryotic cells EXCEPT:(A)DNA double helix;(B)Microtubules;(C)Lipid bilayer-based biomembranes;(D)Potassium channels.

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