At the molecular level, cells from different types of organisms vary in their tolerance to temperature and pH. This variation can mostly likely be attributed to the types of enzymes present in the cells.
- The tolerance ranges for abiotic environmental factors are similar to the geographic ranges that organisms have.
- To put it another way, they can tolerate (or survive in) a specific range of a given factor, but they cannot survive if the element is present in either an excessive or insufficient amount.
- Take temperature, for example. Polar bears thrive in cold climates but would perish in the tropics from excessive heat.
- Cells are incapable of acting as "liquid machinery" at temperatures below freezing and above boiling.
- The majority of cells, however, are still unable to function across the entire range of liquid temperatures.
- Variance in enzyme activity and protein denaturation are most closely related to variation in cells' capacity to vary in their tolerance to temperature, etc. at the molecular level in various animals.
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A biome contains both communities and ecosystems. and a biosphere contains them all.
Cells Can<span> Replicate </span>Their DNA<span> Precisely. Replication is the process by which a double-stranded </span>DNA<span> molecule is copied to </span>produce<span> two identical </span>DNA<span> molecules. ... Each time a </span>cell<span> divides, the two resulting </span>daughter cells<span> must contain exactly the same genetic information, or </span>DNA<span>, as the parent </span><span>cell</span>
Answer:
Calcitonin- reduce blood calcium level
Parathyroid hormone- Raise blood calcium level
Explanation:
The thyroid gland is an endocrine gland which secrete its hormone in the blood directly. Both calcitonin and parathyroid hormone are released by the thyroid gland. Parathyroid hormone is released when the blood calcium level is low.
Parathyroid hormone increases the blood calcium level by osteoclast stimulation which releases calcium from bones and increases blood calcium level. Calcitonin is antagonistic to parathyroid hormone and it reduce the blood calcium level in the blood by stimulating the activity of osteoblast.
<span>hromoplast is the generic term but is usually used to refer only to those plastids that do not have chlorophyll.</span>
