The two membranes pull apart a little and create a small pocket or sack of air. As the developing bird grows, it breathes in oxygen from the air sack and exhales carbon dioxide. Several thousand microscopic pores all over the surface of the egg allow the CO2 to escape and fresh air to get in.
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A phosphate group is removed from an intermediate reactant in the pathway, and the free energy of the reaction is used to add the third phosphate to an available ADP molecule, producing ATP (Figure 2). This very direct method of phosphorylation is called substrate-level phosphorylation.
Echo sounding is the key method scientists use to map the seafloor today. The technique, first used by German scientists in the early 20th century, uses sound waves bounced off the ocean bottom. Echo sounders aboard ships have components called transducers that both transmit and receive sound waves.
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Answer:
DNA makes RNA makes Protein. ... The synthesis of proteins occurs in two sequential steps: Transcription and Translation. Transcription occurs in the cell nucleus and uses the base sequence of DNA to produce mRNA. The mRNA carries the message for making a specific protein out to the cytoplasm where translation occurs.
Explanation:
Answer:1. The basic building block of all forms of life nucleus --cell
2. The rigid wall of plant cells that surrounds the cell membrane-- cell wall
3. The tiny body that contains chlorophyll --chloroplast
4. Carries the genes or inheritance units of a cell --chromosome
5. A protein and fat structure serving as a covering and enclosure for a cell -- membrane
6. The protoplasmic substance separate from the cytoplasm --nucleus
7. The organic substance making up the cells of all living things-- protoplasm
8. The protoplasmic unit of a cell -- protoplast
9. A cell storage body that increases in size with age--vacuole
Explanation;the cell is the basic unit of life. All living organisms are made up of cells.it is made up of the cell membrane and the protoplasm.the protoplasm is the content of the cell while the cell membrane Is the covering of the cell. Cell contains organelles within it which performs specific functions. These function are necessary for the proper functioning of the cell and the organism at large. A cell may be prokaryotic or eukaryotic. A prokaryotic cell usually lacks membrane bound organelles,such as the nucleus. Example of prokaryotes are bacteria and archaea.
Eukaryotes have membrane bound organelles. Examples are plant and animal cells. There are some difference in the plant and animal cell.for example, a plant cell may contain a vacuole, chlorophyll etc which are absent in animal cell.
An animal cell has centrioles which a plant cell lacks.
