Answer – C (Using instruments that have not been calibrated).
When the integrity of an instrument’s calibration has been compromised (usually due to exposure to a shock, vibration, or physical damage), it needs to be calibrated; failure to do this inevitably leads to inaccurate measurement; this is a very common measurement error.
Groundwater contamination occurs when man-made products such as gasoline, oil, road salts and chemicals get into the groundwater and cause it to become unsafe and unfit for human use. Materials from the land's surface can move through the soil and end up in the groundwater. That is why pollution can contaminate an aquifer.
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Answer:
During cellular respiration, glucose breaks down into carbon dioxide and water. This process releases a store of energy, or ATP, that cells can use for their needs. Cellular respiration is a process by which glucose, or sugar, oxidizes intocarbon dioxide and water, releasing energy in the form of adenosine triphosphate (ATP).
Explanation:
Answer:
True
Explanation:
Adenine and Guanine fall under the category of Purine nitrogenous base. Purine is made of six member pyrimidine ring fused to five member imidazole ring. It is water soluble in nature.
A purine always pairs with a pyrimidine base to form a DNA base pair. Thymine and Cytosine are the two pyrimidine bases. Adenine bonds with Thymine by forming two hydrogen bonds and Guanine is bonded to Cytosine via three hydrogen bonds. When a purine base is formed it self inhibits formation of more purine and also activates formation of pyrimidine base. Hence, amount of purine and pyrimidine are almost equal in cell.