Which one of the following statements is not true regarding the steps that must

Question

Which one of the following statements is not true regarding the steps that must occur before a eukaryotic mRNA is translated into a protein?

a) 

A poly A tail is added to the 3' end.

b) 

The mRNA is transported from the nucleus to the cytoplasm.

c) 

A cap structure is added to the 5' end.

d) 

The exons are spliced out.

Question 14 (2 points)

During replication, which enzyme is responsible for sealing nicks in the DNA?

Question 14 options:

a) 

Ligase

b) 

DNA polymerase I

c) 

Primase

d) 

Helicase

Question 15 (2 points)

 
Consider the following DNA non-template (informational strand): ATGAAA.  Suppose a mutation changes nucleotide 5 from an A to a C.  This would result in:

a) 

A silent mutation

b) 

A nonsense mutation

c) 

A missense mutation

Question 16 (2 points)

A DNA molecule contains 16% adenine bases.  Which of the following is true?

a) 

This DNA molecule contains 16% uracil bases.

b) 

This DNA molecule contains 34% cytosine bases.

c) 

This DNA molecule contains 16% guanine bases.

d) 

This DNA molecule contains 32% thymine bases.

Explanation / Answer

13. The exons are spliced out never occur before a eukaryotic mRNA is translated into a protein but intron splicing takes place. So, this statement is not true.

14. During replication, the enzyme which is responsible for sealing nicks in the DNA is LIGASE.

15. Missense mutation because another amino acid will produce due to change of nucleotide at the 5th position of the non-coding strand.

16. If a DNA molecule contains 16% adenine bases then Thymine should also be 16% so A + T = 32% rest 68% will be of cytosine and guanine means each will be 34%.

So, the answer will be b) This DNA molecule contains 34% cytosine bases.

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