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BIOS 100 Quiz 6
- Which of the following events occurs during transcription?
- Those segments of the RNA strand that do not actually code for the protein are removed.
- mRNA binds to a ribosome in the cytoplasm.
- A molecule of RNA is formed based on the sequence of nucleotides in DNA.
- The message in mRNA is translated into a protein.
e. A cap is added to the RNA molecule.:
Answer c. A molecule of RNA is formed based on the sequence of nucleotides in DNA.During transcription, RNA nucleotides line up with their complementary DNA part- ners, transcribing the information in DNA into RNA.
- Which of the following is a correct statement about mRNA?
- mRNA includes a cap that consists of extra adenine nucleotides.
- mRNA moves from the nucleus to the cytoplasm following RNA processing.
- mRNA is transcribed from DNA in the cytoplasm.
- mRNA binds directly to amino acids during translation.
e. Segments of mRNA that code for protein are removed before translation.:
Answer b. mRNA moves from the nucleus to the cytoplasm following RNA processing.mRNA undergoes RNA processing in the nucleus and then moves to the cytoplasm for translation.
- The site of translation is
- the cell nucleus.
- the plasma membrane.
- ribosomes in the cell cytoplasm
d. ribosomes in the cell nucleus. e. the Golgi apparatus.:
Answer c. ribosomes in the cell cytoplasm
- Which one of the following does not play a role in translation?
- DNA
- tRNA
- Amino acids
- Anticodon 1 / 2
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e. Ribosomes:
Answer a. DNA DNA contains the instructions for making proteins, but these instructions are tran- scribed to RNA before translation occurs.
- Which of the following does not occur during RNA processing?
- mRNA attaches to the small subunit of a ribosome.
- Adenine nucleotides are added to the end of the RNA strand, forming a tail.
- Segments of the RNA strand that do not actually code for the protein are removed.
- A modified guanine nucleotide is added to the beginning of the RNA strand as a cap.
e. Segments of RNA that do code for the protein are reconnected.:
Answer a. mRNA attaches to the small subunit of a ribosome.mRNA attaches to the small subunit of a ribosome at the beginning of translation.
- Can one gene make different proteins?
- No, because genes do not make proteins
- No, because one gene can code for only a single protein
- Yes, by splicing the resulting mRNA differently (i.e., removing different exons)
d. Yes, by modifying the original DNA:
Answer c.Yes, by splicing the resulting mRNA differently (i.e., removing different exons)
- In what way(s) can mRNAs be processed?
- By removing the introns (the noncoding regions) of the mRNAs
- By splicing the exons (the coding regions) of the mRNAs in different ways
- By adding caps and tails to the ends of the mRNAs
d. All of the above:
Answer d. All of the above
- Transcription factors control exon spicing.
- True
b. False:
Answer B. False. Transcription factors must bind to DNA before it can be transcribed.
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