1-In some cases, when a mutation occurs in DNA it results in the incorporation o
ID: 12182 • Letter: 1
Question
1-In some cases, when a mutation occurs in DNA it results in the incorporation of anew amino acid in the protein for which that DNA encodes. Occasionally the changed
amino acid is so similar to the original amino acid that there is no functional impact
on the protein. This is called a neutral mutation. Which of the following changes most
likely results in a neutral mutation?
a. D replaces C
b. W replaces G
c. R replaces K
d. V replaces E
2-Please put the following events in the historical order in which they occurred
1) Robert Koch successfully utilized and published, for the first time, criteria for
proving the causal relationship between a bacterium and a disease.
2) Antony van Leeuwenhoek wrote the following in a letter to the Royal Society
of London, “These animacules had diverse colours, some being whitish and
transparent; others with green and very glittering little scales....”
3) Louis Pasteur built a swan-necked flask that enabled air to reach the media but
trapped dust and microorganisms in the bend of the flask.
4) John Tyndall showed that different types of media require different boiling
times to be sterile.
a. 1, 2, 3, 4
b. 2, 3, 4, 1
c. 3, 2, 4, 1
d. 2, 1, 4, 3
Explanation / Answer
1- A Arginine and Lysine are both basic and end in NH2 groups, so they will most likely result in a neutral mutation. 2- B
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