Answer:
c. Biosphere
Explanation:
The biosphere, also known as the ecosphere, is the worldwide sum of all ecosystems. It contains all living things above and below the surface of the Earth.
Answer:
Optic Disc
Explanation:
Optic Disc is a portion of the eye, it can be seen as black spot on the eye, it doesn't contain rods. Optic disc is the point of exit for optic nerve.
The optic disc is also known as the optic nerve Head, it is made up of connective and elastic tissue, it is the passage to the nerve fibber bundles and retinal blood vessels it also maintain intra-ocular pressure against a gradient between the intra-ocular and extra-ocular spaces.
The narrator reacted to the dreaded sentence of death handed down to him BY BLACKING OUT.
The Pit and the Pendulum is a short story written by Edgar Allan Poe. The story is about a prisoner, who endured much torment. The story opens with the trial of the narrator of the story. The narrator was been tried by a panel of judges. At the end of the trial, the narrator was sentence to death and this makes him to black out.
1. A transgenic organism expresses DNA that has been derived from another species. These organisms have altered genomes and are generated in the laboratory for the purposes of research, for example, the "knock-out" mice are tansgenic mice with a particular gene of interest disabled.
2. Recombinant DNA is the DNA that has been altered to contain genes, or portions of genes, from different organisms. The DNA molecules are formed in the lab using recombination methods to bring together genetic material from multiple sources and therefore creating sequences that are not found in the genome.
3. Restriction enzymes are found naturally in bacteria and they cut DNA at specific nucleotide sequences. These enzymes are also called restriction endonucleases, they cleave DNA into fragments at or near specific recognition sites called restriction sites. They are found in bacteria and archaea and they serve to provide a defense mechanism against invading viruses.
4. Biotechnology is the use or alteration of organisms, cells, or biological molecules to produce food, drugs, or other goods. Living systems and organisms are used to make or develop products. Biotechnology enhances cellular and biomolecular processes to develop technologies and product for the purposes of improving life and health.
5. Polymerase chain reaction is a technique that is used to quickly synthesize billions of copiies of a specific segment of DNA. It is a quick and a very efficient way to generate many copies of DNA. The process is applicable when there are small quantities of DNA to analyze. The events of PCR involves; separation of DNA strands, addition of primers, use of DNA polymerase to produce second strand of DNA.
6. In the process known as transformation, bacteria take up pieces of DNA from the surroundings. Bacterial transformation results from the uptake of naked DNA (DNA without associated cells or proteins). Transformation may also occur naturally in some species of bacteria.
