ANSWER:
Most types of cancer are believed to begin with a random genetic mutation. This is followed by mutations, which endow the cancer cells with properties allowing them to grow without normal controls to become a tumor.
Mutation is any change in the DNA sequence of a cell. Mutations may be caused by mistakes during cell division, or they may be caused by exposure to DNA-damaging agents in the environment.
Genetic Mutations that lead to cancer cell formation can occur in two forms:
1. GROWTH-PROMOTING GENES are commonly mutated in cancer cells, becoming SUPER-ACTIVE and producing cells that are too strongly stimulated by growth receptors.
2. Mutations can INACTIVATE the genes that suppress cell proliferation or those that signal the need for apoptosis. These genes are known as TUMOR SUPPRESSOR GENES.
Answer:
Photoautotrophs are organisms that carry out photosynthesis. Using energy from sunlight, carbon dioxide and water are converted into organic materials to be used in cellular functions such as biosynthesis and respiration
Explanation:
the example of photoautrophs are
Examples of phototrophs/photoautotroph include:
Higher plants (maize plant, trees, grass etc)
Euglena.
Algae (Green algae etc)
Bacteria (e.g. Cyanobacteria)
Algae are photoautotrophs found in most ecosystems, but they generally are more important in water-based, or aquatic, ecosystems. Like plants, algae are eukaryotes that contain chloroplasts for photosynthesi
Hi there!
The lower the area, the warner it is, because of the change in air pressure. Less air and less air pressure results in colder temperatures even though higher places may be closer to the sun.
Hope this helps!
Explanation:
The answers are: C D E. Cells are semi-permeable which means it chooses what nutrients and h2o to enter and excretes cell waste into the bloodstream.
