B. To orient themselves and to find food
Since they cannot see very well or even at all in some cases, these animals use echolocation instead to orient themselves, to find where they are, and to find food.
<h2>Replication </h2>
Explanation:
Meselson and Stahl began the experiment by growing E. coli in medium, or nutrient broth, containing a "heavy" isotope of nitrogen
When grown on medium containing heavy nitrogen the bacteria took up the nitrogen and used it to synthesize new biological molecules including DNA
After many generations growing in the heavy nitrogen, the nitrogenous bases of the bacteria's DNA were all labeled with heavy nitrogen and then the bacteria were switched to bacteria containing a light nitrogen and allowed to grow for several generations
They then measured the density of the DNA using density gradient centrifugation
Results obtained contained heavy DNA,Light DNA and hybrid of Light and heavy DNA
The experiment done by Meselson and Stahl demonstrated that DNA replicated semi-conservatively, meaning that each strand in a DNA molecule serves as a template for synthesis of a new, complementary strand
Had it been conservative mode of replication, DNA replication would have resulted in one molecule consisting of both original DNA strands (identical to the original DNA molecule) and another molecule consisting of two new strands (with exactly the same sequences as the original molecule)
Answer:
Pancreas- It mainly function as an endocrine gland, secreting a number of digestive enzymes. Along with that it has a very unique function of secretion of hormones which mainly regulate the blood sugar level. The hormones are secreted by the pancreatic islets also known as islet of Langerhans.
These hormones secreted are glucagon, insulin, somatostatin, and pancreatic polypeptide (PP). Mainly the secretion of glucagon and insulin is done for balancing the level of glucose in blood.
Explanation:
The beta cell produces the hormone insulin, as each islet is comprised of 75 percent of beta cells.
Elevated blood glucose levels stimulate the release of insulin. Now, the function of insulin is to balance the blood sugar level.
<u>Secretion of Insulin Step by step:</u>
- It all starts from the presence of food in the intestine which initiates the release of gastrointestinal tract hormones such as glucose-dependent insulinotropic peptide.
- This is in turn the initial trigger for insulin production and secretion by the beta cells of the pancreas.
- Once nutrient absorption occurs, the resulting surge in blood glucose levels further stimulates insulin secretion.
- insulin appears to activate a tyrosine kinase receptor, triggering the phosphorylation of many substrates within the cell.
- These multiple biochemical reactions converge to support the movement of intracellular vesicles containing facilitative glucose transporters to the cell membrane.
- Insulin triggers the rapid movement of a pool of glucose transporter vesicles to the cell membrane, where they fuse and expose the glucose transporters to the extracellular fluid.
- The transporters then move glucose by facilitated diffusion into the cell interior.
Note:However, the red blood cells, as well as cells of the brain, liver, kidneys, and the lining of the small intestine, do not have insulin receptors on their cell membranes and do not require insulin for glucose uptake.
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<span>Currently, with many climatic classification schemes which have been devised, scholars generally recognize that there are five basic climate types on earth.</span>
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- Hannah ❤
Answer:
i saw that they were called whisk ferns
Explanation: