1. Which experimental technique was used to discover the structure of DNA? A) X-
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Question
1. Which experimental technique was used to discover the structure of DNA?
A) X-Ray Crystalography
B) PCR (Polymerase Chain Reaction or Pretty Cool Reaction)
C) Gel Ectrophoresis
D) Radio wave crystallography
E) None of the above
2. What determines which traits will be passed on to the next generation in the greatest frequency?
A) acquired characteristics
B) mutations
C) common descent with modification
D) natural selection
3. If the sequence TCGTA was used as a template in DNA replication, what would be the sequence of bases on the corresponding, newly synthesized DNA strand?
A) ATGCT
B) CTACG
C) AGCAT
D) AGCAU
E) UCGUA
Explanation / Answer
1. Answering this question I would like to light on the concepts and then find then answers,
PCR reaction is used for the amplification of an nucleotide chain, in this process, in-vitro, we can just come to know whether a sequence of our choice is present or not in any experimental purpose. After that we take the sample in a laboratory set up to see the specific gene sequence by running in a Agarose gel, here too we can just have the outer appearance but not the real structure of DNA to be shown.
Radio wave crystallography too was not used to identify its structure, in the year of 1953, James Watson and Francis Crick solved the puzzle of the double helix by using the X Ray crystallography, the twisted-ladder structure of deoxyribonucleic acid (DNA) was discovered. Answer choice A) is correct.
2. The determinant factor to determine which traits will be passed on to the next generation in the greatest frequency is to know by which way a progeny species acquires the characteristics form their parents.
Mutation is just a way that changes the genetic structure and modifies it in various ways, this cannot be the variant. Common descent with modification is looking like the characters are just modified, but they can just merely modify in an organism without passing or passing it. The other answer choice as Natural selection is indeed a strong measure, but that too is only to show that species adapt to their nature by their acquired characters not says weather they acquire specific characters.
So final conclusion here is the option A) acquired characteristics, in here we are certain that certain acquisition has made the specific change that the organism could survive with among the fittest and this is what also supported by the other mechanisms like mutation and natural selection.
3.
The replication of DNA in-vivo takes care by the DNA-polymerase and there is an accuracy to deal with this process along with many other cell factors involved in it. From the sequence given in the picture is the chain of nucleotide bases as TCGTA.
This would be replicated into its corresponding pair sequence, as by "Chargaff's rule" we know that A pairs with T and G is with C. So the final sequence would be C) AGCAT.
TCGTA
AGCAT
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