<span>asexual reproduction. </span>
Answer:
2. mRNA/ formed from the DNA gene sequence with the help of RNA polymerase
Explanation:
Ribonucleic acid, commonly known as, RNA, is one of the two nucleic acid biomolecule. Three types of RNA exists with varying functions viz: Transfer RNA (tRNA), ribosomal RNA (rRNA), and messenger RNA (mRNA).
- mRNA is a type of RNA that is formed from the DNA gene sequence during transcription with the help of RNA polymerase. It contains codons which determine the correct amino acid sequence for a protein.
- tRNA is a type of RNA formed in the nucleus, which contains anticodons (complementary to mRNA codons) that recognizes mRNA codons and carries corresponding amino acids to the ribosome.
- rRNA is a type of RNA that makes up bulk of the ribosome (organelles for protein synthesis).
Answer:
B. preservation of advantageous genetic mutations
Explanation:
The process of natural selection involves the preservation of advantageous genetic mutation in a given population.
Natural selection is one of the key factors that ensures the evolution of organisms.
- Desired traits that are able to survive adverse conditions like disease, food shortage, natural disasters are favored by the process of natural selection.
- Traits that also undergo advantageous genetic mutation in order to get a competitive advantage is also accrued to natural selection.
Large, permanent caves like those on the Sandy only form when a glacier is thin and the weight of the ice no longer squeezes the caves shut, allowing warm air to flow into the glacier. McGregor and Cartaya have drawn on years of experience mountaineering and caving to safely explore the caves in the Sandy Glacier.