How does an electron transport chain work in cells as a controlled energy release?
What will be an ideal response?
Cells use oxygen to break the bonds of organic molecules, but they have no way to harvest the explosive burst of energy that occurs during burning. Instead, they break the molecules apart in pathways that release the energy in small, manageable steps. Most of these steps are oxidation–reduction reactions (redox reactions). In a typical redox reaction, one molecule accepts electrons (it becomes reduced) from another molecule (which becomes oxidized). Electrons lose energy as they move through an electron transfer chain. The energy released by electrons is harnessed for cellular work.
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Populations can be described in terms of their diversity and stability
Indicate whether the statement is true or false.
Which of the following would be an accurate comparison of mitosis and meiosis?
1.Mitosis takes place in animals; meiosis takes place in plants. 2.Mitosis gives rise to cells that are genetically identical; meiosis gives rise to cells that have half the amount of genetic information as the original cell. 3.Mitosis takes place for producing eggs and sperm; meiosis takes place for growth and repair of damaged tissue. 4.Abnormal cell growth would be due to errors in meiosis.
pH is
a. a measure of phosphorous concentration. b. a measure of hydrogen ion concentration. c. measured by counting the number of different kinds of aquatic insects. d. measured on a scale from 1 to 100
The animal phylum that contains the greatest number
of named species is a. Mollusca. b. Arthropoda. c. Nematoda. d. Chordata. e. Annelida.