Lichens live on the sides of trees to access sunlight. During this process there is no apparent harm nor benefit to the tree. This is an example of
A. commensalism.
B. parasitism.
C. herbivory.
D. predation.
E. mutualism.
A. commensalism.
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A distinctive feature of eukaryotes is the organization of tightly packaged chromosomal DNA with proteins into a membrane-bound structure called a:
A. nucleolus. B. cell. C. nucleus. D. plasma membrane.
While the pH of saliva ranges from 6.5 to 11.5, the pH in the stomach is about pH 2. What would you expect the optimum pH to be for the enzymes secreted into your stomach that digest proteins into amino acids?
What will be an ideal response?
Rigor mortis occurs when ____
a. ATP levels fall b. calcium levels rise c. potassium levels fall d. acetylcholine stimulates contraction e. ADP is produced
Which part of the immune system does not target specific microbial invaders?
A) antibodies B) innate response C) antigens D) specific defense