Which statement is true?
a. Horizontal gene transfer can only occur between single-cell organisms from the Archaea and Bacteria domains.
b. The tree of life phylogenetic model proposed by Darwin has been completely abandoned by modern science.
c. Phylogenetic models are necessarily incomplete descriptions of evolutionary relationships between organisms.
d. The most common form of horizontal gene transfer occurs when one organism consumes another organism.
c. Phylogenetic models are necessarily incomplete descriptions of evolutionary relationships between organisms.
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Which of the following is true of both T cells and B cells?
A. They are produced from stem cells of the bone marrow. B. They can help attack and destroy invading pathogens. C. They are effector cells against specific pathogens. D. They typically have a short life span. E. All of these statements are true.
Which of the following is NOT a characteristic of viruses?
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True or False: The innate immune system is mediated by phagocytes
a. TRUE b. FALSE