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Question: one question double check section as well several genes code...

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One question, double check section as well.

Several genes code for enzymes that are responsible for histidine biosynthesis in Escherichia coli. Part of the amino acid sequence for one of these enzymes is:


A series of mutants that have lost activity for this enzyme are recovered. The mutant products are analyzed and found to have the following amino acid sequences:

Mutant 1: Met-Pro-Trp-Pro-Glu-Lys-Cys
Mutant 2: Met-Pro
Mutant 3: Met-Pro-Cys-Gly-Pro-Lys-Met
Mutant 4: Met-Pro-Trp-Pro-Lys-Asp

Choose the correct type of mutation that occurred in the DNA to produce each mutant type.
Nonsense :
Point  :
Addition :
Deletion :


Double check section:

A small section of Saccharomyces cerevisiae gene has the amino acid sequence valine, histidine, cysteine, and lysine.

A mutation in the above section of the amino acid sequence resulted in the substitution of amino acid lysine with amino acid asparagine.

The mutation in the antisense strand DNA of Saccharomyces cerevisiae gene described above involves

Select one:

a. the substitution of second adenine base from AAG

b. the substitution of cytosine base from TTC

c. the substitution of guanine base from AAG

d. the substitution of second thymine base from TTC

*** I picked c, is that correct?

A small section of a gene for a protein has the following nucleotide sequence:


Which of the following mutations would cause a missense mutation in the sequence shown above?

Select one:

a. Replacement of second guanine base with cytosine base

b. Replacement of first cytosine base with guanine base

c. Replacement of final thymine base with guanine base

d. Replacement of first thymine base with adenine base

** Picked A

Which of the following was not one of the first uses of modern biotechnology?

Select one:

a. The insertion of a bacterial insulin gene into human cells.

b. The cloning of a mammal.

c. The insertion of an antifreeze gene into a fish.

d. The insertion of a human insulin gene into bacteria.

** I picked A

What are the sticky ends of the restriction fragments?

Select one:

a. The surfaces of sticky ends contain matching base pairs, allowing fragments to splice.

b. The surfaces of sticky ends have glue like substance that allow fragments to splice.

c. The surfaces of sticky ends contain the exact same nucleotides, allowing fragments to bond.

d. The surfaces of sticky ends have velcro like structure, allowing fragments to bond.

** a

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