Which of the following is not part of the lymphatic system?
1.adrenal gland
2.spleen
3.thymus
4.tonsils
1
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When a cell secretes a growth factor that binds to receptors on its own membrane preventing it from proliferating, this is an example of ____.
A. direct intercellular signaling B. endocrine signaling C. contact-dependent signaling D. paracrine signaling E. autocrine signaling
What is the primary characteristic of all animals in the phylum Arthropoda?
a. jointed appendages b. incomplete digestive systems c. asexual reproduction d. pseudocoelomic body cavities
How can a mutation in a tumor-suppressor gene behave as a recessive allele at the cellular level, but appear as a dominant allele in pedigree analysis?
A) Some functional protein can still be produced in a cell heterozygous for a loss-of-function allele; however, an additional mutation can inactivate the second allele, eliminating all functional protein allowing cancer to occur in many family members. B) A single functional allele is sufficient to regulate the cell cycle, but not sufficient to promote apoptosis, allowing cancer to develop in every generation. C) A cell with half the amount of the functional tumor-suppressor protein can form benign tumors that will occur in every generation in the pedigree. D) Some functional protein can still be produced in a cell heterozygous for a loss-of-function allele; but loss-of-function tumor-suppressor alleles are so common in the population that many individuals are homozygous.
Which of the following is not true of type III hypersensitivity?
A. Serum sickness is a systemic response. B. It involves an immune complex reaction. C. Antigen-antibody complexes are deposited in the basement membrane of epithelial tissues. D. It involves production of IgE antibodies. E. The Arthus reaction is a local response.