A gene codes for a protein that is 500 amino acids long. A nonsense mutation occ

Question

A gene codes for a protein that is 500 amino acids long. A nonsense mutation occurs at the 6th codon. What is the result?

A polypeptide that has a different amino acid at position 6.

A polypeptide that has the correct amino acids for the first 5 position, and then incorrect amino acids after that.

A polypeptide that is missing the 6th amino acid.

A polypeptide that is 5 amino acids long.

Question 2

Select one answer.

10 points

Transcription produces:

Proteins from a DNA template

DNA from a DNA template

RNA from a DNA template

Proteins from an RNA template

Question 3

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10 points

A gene codes for a protein that is 500 amino acids long. Which of the following mutations is likely to be the most deleterious?

a missense mutation at the fifth codon

a missense mutation at the 490th codon

a nonsense mutation at the fifth codon

a nonsense mutation at the 490th codon

Question 4

Select one answer.

10 points

Which nitrogen base is not found on nucleotides used to build the new molecule in transcription?

G

U

C

T

A

Question 5

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10 points

Which of the following statements is correct regarding DNA replication, PCR, and transcription?

All three processes require primers.

Both DNA replication and PCR use DNA polymerases.

All three processes happen in the cell naturally.

All three processes result in a double stranded product.

Question 6

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10 points

The tRNA with UAU as the anticodon would be attached to which amino acid?

isoleucine

tryrosine

leucine

serine

Question 7

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10 points

Which of the following mutations would not be noticeable when studying the expressed traits (or proteins) of an organism?

missense

frameshift

nonsense

silent

Question 8

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10 points

When a cell is getting ready to divide into two cells (during the process of mitosis), which process must first happen so that the entire genome can be passed to the new daughter cells?

transcription

DNA replication

translation

PCR

Question 9

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10 points

Which of the RNA molecules can best be described as a copy of the gene that codes for a protein? (This RNA molecule carries the genetic information necessary to build a protein)

mRNA

tRNA

rRNA

all of these

Question 10

Select one answer.

10 points

Identify the flow of genetic information during protein synthesis in a eukaryotic Cell.

Transcription produces an mRNA molecule in the nucleus. The mRNA moves to the cytoplasm where translation occurs.

Translation produces a tRNA molecule in the nucleus; the tRNA transports a protein to the cytoplasm of the cell.

mRNA moves a protein to the DNA and makes a copy of the DNA through translation.

DNA makes a copy of itself which is transported from the nucleus to the cytoplasm by a chain of amino acids.

Explanation / Answer

1. A polypeptide that is 5 amino acids long.

2. RNA from DNA template.

3. a nonsense mutation at the fifth codon

4. T

5. All three processes require primers.

6. isoleucine

7. missense

8. DNA replication

9. mRNA

10. Transcription produces an mRNA molecule in the nucleus. The mRNA moves to the cytoplasm where translation occurs.

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