QUESTION IMAGE
Question
xavier uses a chart to list the roles of two different molecules in protein production. which headings best complete the chart? chart: y (brings amino acids for the ribosome to link together), z (stores the information for protein synthesis) options: y: dna, z: trna; y: rrna, z: mrna; y: trna, z: rrna; y: trna, z: mrna (paraphrased from the image)
In protein production (central dogma), DNA holds the genetic code (Y: DNA provides the code for amino acids? Wait, no—DNA has the gene, which is transcribed to mRNA (messenger RNA) that carries the code for amino acids. Then tRNA (transfer RNA) brings amino acids, and rRNA (ribosomal RNA) is part of ribosomes. Wait, the table: Y is "brings amino acids for the ribosome"—that's tRNA. Z is "stores the information for protein synthesis"—that's DNA? No, wait, DNA stores the info, but mRNA carries it. Wait, let's recall:
- DNA: stores genetic info (but in protein synthesis, the template for transcription is DNA, then mRNA is the messenger.
- tRNA: transfers (brings) amino acids to ribosome.
- mRNA: carries the genetic code (codons) for amino acids.
Wait the options: Let's list the options:
First option: Y: DNA, Z: tRNA → No, DNA doesn't bring amino acids.
Second: Y: tRNA, Z: mRNA → tRNA brings amino acids (correct for Y), mRNA stores info? No, mRNA carries info from DNA to ribosome. Wait, maybe the table: Y is "brings amino acids for the ribosome" → tRNA (Y: tRNA). Z is "stores the information for protein synthesis" → DNA? No, but options: Let's check the options:
Looking at the options (from the image, the choices are like:
- Y: DNA, Z: tRNA
- Y: tRNA, Z: mRNA
- Y: mRNA, Z: tRNA
- Y: tRNA, Z: rRNA
Wait no, the image's options (as per OCR-like text):
First option: Y: DNA, Z: tRNA
Second: Y: tRNA, Z: mRNA
Third: Y: mRNA, Z: tRNA
Fourth: Y: tRNA, Z: rRNA? Wait no, the text shows:
Options:
- Y: DNA, Z: tRNA
- Y: tRNA, Z: mRNA
- Y: mRNA, Z: tRNA
- Y: tRNA, Z: rRNA? Wait, no, the original problem's options (from the image) are:
First option: Y: DNA, Z: tRNA
Second: Y: tRNA, Z: mRNA
Third: Y: mRNA, Z: tRNA
Fourth: Y: tRNA, Z: rRNA? Wait, no, let's re-express:
The table has two columns: Y (brings amino acids for ribosome) and Z (stores info for protein synthesis).
So Y's function: brings amino acids to ribosome → tRNA (transfer RNA) does that.
Z's function: stores information for protein synthesis → DNA? But DNA is the original, but in the process, mRNA carries the info. Wait, maybe the question is about the roles in protein synthesis (transcription and translation).
Wait, DNA stores the genetic information (so Z: DNA? But options don't have Z: DNA with Y: tRNA? Wait the options:
Looking at the text:
First option: Y: DNA, Z: tRNA → No, DNA doesn't bring amino acids.
Second: Y: tRNA, Z: mRNA → tRNA brings amino acids (correct for Y), mRNA carries info (but does mRNA "store" info? No, it's a copy. Wait, maybe the question has a typo, but the correct roles:
- tRNA: transfers (brings) amino acids to ribosome (Y: tRNA)
- mRNA: carries the genetic code (information) from DNA to ribosome for translation (Z: mRNA? No, mRNA is the messenger, not the storage. Wait, DNA is the storage, but if the options have Z: mRNA, maybe the question considers mRNA as the carrier (so "stores" in the sense of carrying the info for protein synthesis).
Wait the correct answer is the option where Y is tRNA (brings amino acids) and Z is mRNA (carries the info for protein synthesis). Let's check the options:
Looking at the options (from the image's text):
The options are:
- Y: DNA, Z: tRNA
- Y: tRNA, Z: mRNA
- Y: mRNA, Z: tRNA
- Y: tRNA, Z: rRNA
Wait, no, the OCR text shows:
First option: Y: DNA, Z: tRNA
Second: Y: tRNA, Z: mRNA
Third: Y: mRNA, Z: tRNA
Fourth: Y: tRNA, Z: rRNA? No, the fourth option is Y: tRNA, Z: rRNA? Wait, no, the text is:
"Y: DNA, Z: tRNA"
"Y: tRNA, Z: mRNA"
"Y: mRNA, Z: tRNA"
"Y: tRNA, Z: rRNA"
Wait,…
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Y: tRNA, Z: mRNA (the option with Y: tRNA and Z: mRNA)