Which macromolecule has a sugar-phosphate backbone?
What will be an ideal response?
nucleic acid
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After a muscle cell contracts, which of the following must occur for the muscle to stop contracting?
A. Calcium ions must be pumped back into the endoplasmic reticulum. B. Calcium ions must flow out of the endoplasmic reticulum. C. Calcium ions must flow into the muscle cell. D. Calcium ions must flow out of the muscle cell. E. Calcium ions must be pumped out of the muscle cell.
Four of the five substances listed below are
potentially toxic waste products of metabolism. Select the exception. a. urea b. water c. uric acid d. carbon dioxide e. ammonia
On Long Island, New York, a population of wall lizards that originated from a group in Italy is present. Several had been imported to be sold as pets many decades ago, and some escaped and started a new population in this suburban area
What concept applies to this situation? A) genetic drift B) the founder effect C) a population bottleneck D) gene flow
In a grasshopper, all the body tissues are bathed in blood that is in the
A) tracheae. B) heart. C) spiracles. D) hemocoel. E) capillaries.