What is the underlying molecular cause of Crohn's disease?
a. B cells are mutated and do not release antibodies
b. Receptor proteins are mutated and cause an abnormal immune response.
c. Helper T cells are inactivated.
d. Mucus is not released from epithelial tissues.
e. Antigen-presenting cells are absent.
b
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____________________, such as ulcerative colitis and Crohn disease, develop when bacteria are able to breach the barrier between the digestive system and the body
Fill in the blank(s) with correct word
What happens as air cools?
a. It rises and releases moisture. b. It sinks and picks up moisture. c. It sinks and releases moisture. d. It rises and picks up moisture. e. It does none of these
In an attempt to visualize the fluid mosaic model of a
membrane, we could describe the __________ as floating in a sea of __________. a. lipid; protein. b. phospholipids; carbohydrate. c. proteins; lipid. d. fats; water. e. glycolipids; sterols.
There are some similarities between prokaryotic and eukaryotic cells. Which of the following structures is found in both prokaryotic and eukaryotic cells?
A. lysosome B. mitochondrion C. nucleus D. ribosome