All of the following represent anchoring junctions EXCEPT _____
A. adherens junctions.
B. hemidesmosomes.
C. desmosomes.
D. focal adhesions.
E. tight junctions.
E. tight junctions.
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Nitrogen fixation by Frankia bacteria is efficient enough to allow alder trees to grow in the absence of combined nitrogen.
Answer the following statement true (T) or false (F)
In Frederick Griffith's experiment, live R cells and dead S cells were injected into mice, causing fatal pneumonia. Neither live R cells nor dead S cells alone cause pneumonia, so Griffith concluded that _____
1.DNA is the genetic material 2.some, but not all, R cells cause pneumonia 3.DNA encoding the ability to form capsules was released from dead S cells and picked up by R cells 4.hereditary information of unknown identity transformed R cells into S cells 5.DNA controls the synthesis of specific products
How does the digestion and absorption of fat differ from that of carbohydrates?
A. Processing of fat does not require any digestive enzymes, whereas the processing of carbohydrates does. B. Fat absorption occurs in the stomach, whereas carbohydrates are absorbed from the small intestine. C. Fat must be partially digested by bacteria in the large intestine before it can be absorbed, which is not the case for carbohydrates. D. Most absorbed fat enters the lymphatic system, whereas carbohydrates directly enter the blood. E. Carbohydrates need to be emulsified before they can be digested, whereas fats do not.
Worldwide, the major cause of hemolytic anemia is ____
a. malaria b. leukemia c. infectious mononucleosis d. anemia e. toxemia