In which part of the immune system are M cells found?
a. lymph nodes
b. spleen
c. mucosa-associated lymphoid tissue
d. diffused in the lymph
c. mucosa-associated lymphoid tissue
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What is the main source of nutrition for animals that live on the continental shelf?
What will be an ideal response?
An enzyme functions in a biosynthetic pathway in bacteria. You predict that the product of the reaction may regulate the levels of the protein by
A) binding an aptamer in the RNA leader sequence that alters the conformation to block the ribosome binding site. B) binding an aptamer in the RNA leader sequence that alters the conformation to expose the ribosome binding site. C) binding the promoter region to prevent transcription. D) binding an aptamer in the RNA leader sequence that causes an antiterminator to form.
After studying the wildlife in the Amazon basin, ____ proposed the theory of natural selection
a. Cuvier b. Lyell c. Lamarck d. Aristotle e. Wallace
What property of phospholipids makes them suitable for the formation of the double layer found in membranes?
A. They have both a hydrophobic and a hydrophilic end. B. They are uncharged. C. They can interact with proteins. D. They serve as an attachment site for carbohydrates. E. They are composed of fatty acids.