A recent study suggests the surprising idea that intestinal goblet cells present food antigens to dendritic cells to induce tolerance to food molecules. Thus, goblet cell dysfunction may be a cause of food allergies. If this is true, it illustrates the importance of coordination between which two organ systems?
A. circulatory system and endocrine system
B. digestive system and endocrine system
C. digestive system and immune system
D. immune system and circulatory system
Answer: C
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Sumatra is home to one species of orangutan, a species of critically endangered elephant, and the Sumatran tiger, but half of Sumatra’s forest is now gone. The neighboring island of Borneo, home to the other species of orangutan, has lost a similar area of forest. Forest loss continues in protected areas of Borneo. All three species of orangutan are now listed as endangered by the International Union for Conservation of Nature (IUCN), but they are simply the most visible of thousands of species that will not survive the disappearance of the forests in Sumatra and Borneo. This is an example of which type of threat to biodiversity?
a. introduction of exotic species b. global climate change c. habitat loss d. overharvesting
How does cyclic electron flow differ from noncyclic electron flow?
a. No NADPH is produced by cyclic electron flow. b. No O2 is produced by cyclic electron flow. c. The cytochrome complex in the electron transport chain is not involved in cyclic electron flow. d. Both a and b are correct. e. a, b and c are correct
Pasteur's experiment with the swan-necked flask rejected the spontaneous generation hypothesis by demonstrating that...
What will be an ideal response?
Each genetically distinct group of lymphocytes that possesses the same specificity is called a _____.
Fill in the blank(s) with the appropriate word(s).