The three particles that make up an atom are
a) protons, neutrons, and isotopes
b) neutrons, isotopes and electrons
c) positive, negatives, and electrons
d) protons, neutrons, and electrons
Ans: d) protons, neutrons, and electrons
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We study cellular respiration because it is one of the most important pathways in biology. In fact, nearly all
carbohydrates at some point in their catabolism are directed through cellular respiration. Why is it unnecessary to have multiple independent pathways to break down different molecules?
a. Using cellular respiration is theoretically the most efficient way to break down sugars and other molecules. b. Oxygen must be used in the breakdown of all molecules in order to yield ATP. c. Greater complexity would lead to an eventual failure of the biological system. d. Most biological cells only catabolize one or two different types of sugars and only need one main pathway. e. Energy-containing macromolecules can be converted to products that can enter at various points in the cellular respiration pathway.
Conservationists have identified 25 areas worldwide as hotspots. This means these areas
A. have the highest numbers of invasive species worldwide. B. have serious pollution problems and are being targeted for cleanup. C. are currently being preserved. D. have high numbers of endemic species, and those numbers are increasing. E. have high numbers of endemic species, and those numbers are decreasing.
Dr. Edward Jenner realized that cows have a disease called cowpox, which is like a disease that infects humans called smallpox; Jenner noticed that milkmaids whose hands were infected with cowpox were not contracting smallpox. Jenner infected a child with the pus from a cowpox blister, and found that the child did not contract smallpox. Which statement represents a supporting hypothesis?
A. The cowpox virus prevented the small pox virus from entering the child's immune system. B. the smallpox virus was so similar to the cowpox virus that the child's immune system ignored the smallpox virus C. The cowpox infection will prevent the child from being infected by the small pox virus. D. The cowpox infection will have no effect on the child's immunity to the small pox virus.
The resulting cell from the union of a male animal sex cell and a female animal sex called is called a(n)
A. gamete. B. morula. C. polar body. D. zygote. E. oogonium.