Which of the following is not part of the lymphatic system?

1.adrenal gland
2.spleen
3.thymus
4.tonsils


1

Biology & Microbiology

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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

Biology & Microbiology

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

Biology & Microbiology

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.

Biology & Microbiology

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.

Biology & Microbiology