How did stromatolites contribute oxygen to the early atmosphere?
by weathering of rocks
through photolysis
through methane degradation
through photosynthesis
Answer:
by weathering of rocks
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Question - Explain the cellular functions that occur when antibiotics attack a bacteria cell.
Answer - When bacteria grows to a certain limit it will not be able to divide or spread any further. (Transportation is trough the blood). The purpose of antibiotics in this case is to stop any further growth ot spreading from causing any harm to the body. In cellular functions the antibiotics used will ruin the DNA of the bacteria which will stop the growth.
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Cytochromes:- They are iron containing hemoproteins that serve many cellular functions including energy production, steroid biosynthesis, and degradation of toxins.
Cytochromes occur in all organisms except a few obligate anaerobes. They are structurally similar among organisms. These are proteins to which one to two tetrapyrrole rings are bound. These tetrapyrroles are very similar to the chromophores of chlorophylls in plants. However, chlorophylls(in plants) contain Mg++ as the central atom in the tetrapyrrole, whereas the cytochromes(in aerobic animals) have an iron atom (Figure).
Asexual reproduction produces genetically identical offspring and sexual reproduction creates variation in the offspring. When the environment changes and it affects the asexual offspring it will affect all identical copies whereas since the sexual offspring have more variation, they are more likely to survive.
Answer: it's C
Explanation: At the same time, the Southern Hemisphere is tilted away from the sun and experiencing winter. The summer season begins in the Northern Hemisphere on June 20 or 21, known as the summer solstice, when the axis of rotation is tilted a full 23.5° toward the sun.
