Imagine a genomic researcher who is analyzing the genome of different types of cats. She finds that a particular sequence in the
North American Bobcat genome is exactly homologous to a sequence found in the common house cat, while all other sequences in those two genomes differ at many nucleotides. (The most recent common ancestor between bobcats and house cats is estimated to be about 6.8 million years, plenty of time for mutation to generate DNA sequence variation.) Which of the following could explain the identical sequence in these otherwise differing genomes?
01. The sequence encodes a ribosomal protein that is critical for life and can not be easily mutated while retaining function.
02. The sequence is contained in a virus that has infected germline cells in both species.
03. The sequence is from an intron of a gene that encodes a muscle protein.
Provide a rationale for why each of the three statements above are correct or incorrect.
An orange peel in a trash will start to decompose.
The carbon atoms will be released into the air as a result of decomposition.
These carbon atoms will be converted into carbon dioxide in the atmosphere.
Plants will take in this carbon dioxide for making food by the process of photosynthesis.
When animals will consume the pants, the carbon products will be accumulated int he body of the animals. Some of the carbon will be converted into carbon dioxide in the animals and will pass out of the animal's body through respiration.
