<span><span>long ears that help them detect the predator
long ears to cool themselves
</span></span>
Answer:
Explanation:
This is known as the RNA world hypothesis. Scientists favor RNA over DNA as the first genetic molecule for several reasons. Perhaps the most important is that RNA can, in addition to carrying information, act as a catalyst. ... A catalytic RNA could, potentially, catalyze a chemical reaction to copy itself.
Answer: The answer is A. Explains how organisms change in response to the environment.
Explanation: A scientific theory is an EXPLANATION of an aspect in the natural world. In other words, it just tells why something happens. Now it is not just a guess, it is well-supported by evidence and previous studies.
Now to knock out your other choices:
B. is wrong because:
A scientific theory does not predict. It can serve as a basis for a prediction, or what you call a hypothesis, but it does not predict an outcome.
C. is wrong because:
As mentioned earlier, a theory is WELL-SUPPORTED by evidence and previous research.
D. is wrong because:
A theory does not become a scientific law.
The given question is incomplete, the complete question is:
A particular type of DNA damage involves purely chemical (non-enzymatic) degradation steps, like deamination, or depurination. Due to these, and other forms of DNA damage, cells employ a range of DNA repair mechanisms in order to maintain the integrity of the genetic code over millions of generations. Many eukaryotic cells have a specialized repair mechanism for the repair of G-T mismatches. This mismatch is repaired to form G=C (not A=T) base pair. This G-T mismatch repair mechanism occurs in addition to a more general system that repairs virtually all mismatches. Suggest a reason why cells might require a specialized system to repair G-T mismatches in this way.
Answer:
The repair of G-T mismatch is performed through the process called very short patch repair. The mismatch takes place because of the deamination of 5-methyl cytosine into thymine that occurs due to DNA mutation. The process of repair is performed with VSR endonuclease that eradicates the thymine on 5 prime end and then resynthesis of the patch is done with the assistance of DNA polymerase.
In case, if the repair does not take place it can result in transition mutation, that is, a kind of point mutation. As this repair is required to be very accurate, thus, the special VSR endonuclease is used for very short patch repair.