Question at position 25 A sequence of eukaryotic mRNA that reads: 5'-GpppCCUGUGGACAUGCCUGAAUCAGCUUUAAUCUGAAAAAAA-3' should code for ____ amino acids after all steps of conversion into protein are complete.6781110Clear my selection单项选择题
A
6
B
7
C
8
D
11
E
10

Question

Question at position 25 A sequence of eukaryotic mRNA that reads: 5'-GpppCCUGUGGACAUGCCUGAAUCAGCUUUAAUCUGAAAAAAA-3' should code for ____ amino acids after all steps of conversion into protein are complete.6781110Clear my selection单项选择题

A

6

B

7

C

8

D

11

E

10

BlackTom AI · Accepted Answer

To determine how many amino acids are coded, I first look for the start signal for translation in the provided mRNA sequence. In eukaryotes, translation begins at the start codon AUG, and the reading frame proceeds codon by codon from there.
The given sequence (ignoring the 5' cap Gppp) is: CCUGUGGACAUGCCUGAAUCAGCUUUAAUCUGAAAAAAA. Scanning for AUG, I find AUG starting at the portion ...AUGCCUGAAUCAGCUUUAAUCUGAAAAAAA, so the reading frame begins with AUG.
Now I segment the sequence into codons starting from that AUG: AUG | CCU | GAA | UCA | GCU | UUU | AAU | CUG | AAA | AAA. Each codon codes for one amino acid until a stop codon is encountered. In this segment, there is no STOP codon (UAA, UAG, or UGA) within the provided sequence, so translation would continue to the end of the sequence, giving one amino acid per codon.
Counting these codons from AUG to the end yields 10 codons, hence 10 amino acids.
Now evaluating the answer choices:
- 6: This undercounts the number of codons in the reading frame; there are more than six codons from AUG to the end, so this is incorrect.
- 7: Also too few; the framed sequence contains ten codons in the translated region, not seven.
- 8: Still short of the actual count; the sequence provides ten codons from AUG onward, so eight is not accurate.
- 11: This overcounts relative to the actual ten codons found; there aren’t eleven codons in the translated region here.
- 10: This matches the identified number of codons from the start AUG to the end of the sequence, giving ten amino acids.

Therefore, option 10 is the correct choice because translation in this reading frame yields ten amino acids from AUG to the sequence end. Note: the 5' cap sequence (Gppp) is not part of the coding region, and no stop codon truncates the reading frame within the provided sequence.

Question at position 25 A sequence of eukaryotic mRNA that reads: 5'-GpppCCUGUGGACAUGCCUGAAUCAGCUUUAAUCUGAAAAAAA-3' should code for ____ amino acids after all steps of conversion into protein are complete.6781110Clear my selection单项选择题

类似问题

Question at position 18 A sequence of eukaryotic mRNA that reads: 5'-GpppCCUGUGGACAUGCCUGAAUCAGCUUUAAUCUGAAAAAAA-3' should code for ____ amino acids after all steps of conversion into protein are complete.7101168Clear my selection

Question at position 22 What does a ribosome read during translation?mRNAtemplate strand of DNAcoding strand of DNA

_______ is the process in which a protein is assembled at a ribosome.

The bottom loop of the tRNA molecule is called the . This sequence recognizes and pairs with the on the mRNA.

What process converts the mRNA "message" into a sequence of amino acids?

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Question at position 25 A sequence of eukaryotic mRNA that reads: 5'-GpppCCUGUGGACAUGCCUGAAUCAGCUUUAAUCUGAAAAAAA-3' should code for ____ amino acids after all steps of conversion into protein are complete.6781110Clear my selection单项选择题

类似问题

Question at position 18 A sequence of eukaryotic mRNA that reads: 5'-GpppCCUGUGGACAUGCCUGAAUCAGCUUUAAUCUGAAAAAAA-3' should code for ____ amino acids after all steps of conversion into protein are complete.7101168Clear my selection

Question at position 22 What does a ribosome read during translation?mRNAtemplate strand of DNAcoding strand of DNA

_______ is the process in which a protein is assembled at a ribosome.

The bottom loop of the tRNA molecule is called the ______. This sequence recognizes and pairs with the ______ on the mRNA.

What process converts the mRNA "message" into a sequence of amino acids?

更多留学生实用工具

希望你的学习变得更简单

The bottom loop of the tRNA molecule is called the . This sequence recognizes and pairs with the on the mRNA.