Discuss the importance of hydrogen bonds in the chemistry of the cell
What will be an ideal response?
The chemistry of the cell would basically be impossible without hydrogen bonds. Water, which is required by all cellular reactions, would not have its unique properties of cohesiveness and polarity without hydrogen bonds. Hydrogen bonds hold the double helix of DNA together and contribute to the overall shape of protein molecules. However, unlike covalent bonds, hydrogen bonds are low energy bonds, so they can easily and temporarily be broken, a characteristic that is important at certain points in the cell's life cycle (such as during DNA replication).
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How is respiration controlled in humans?
What will be an ideal response?
One symptom of kidney failure can be the appearance of blood in the urine. This would indicate that which part of the kidney was damaged?
A. proximal convoluted tubule B. distal convoluted tubule C. glomerulus D. nephron E. collecting duct
Atropine, which is used to dilate the eye, inhibits acetylcholine muscarinic receptors.
a. true b. false
Why do animals in deep ocean depths live in complete darkness?
a. because 100% of the ocean is at a depth where no light penetrates b. because over 90% of the ocean is at a depth where no light penetrates c. because over 80% of the ocean is at a depth where no light penetrates d. because over 70% of the ocean is at a depth where no light penetrates