Some virulence genes are carried on plasmids or lysogenic bacteriophages
Indicate whether the statement is true or false.
Answer: TRUE
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Which of the following statements is not true of early plant evolution, as we have learned from Rhynie cherts?
A. Early vascular plants were small, up to 15 cm tall. B. Early vascular plants branched repeatedly and contained sporangia at their tips. C. The stems of early vascular plants lacked a cuticle or stomata. D. Some of the early plants have a branched sporophyte, but no evidence of vascular tissue. E. Fossils indicate that the roots and leaves of lycophytes evolved independently from those of ferns, horsetails, and seed plants.
A ____ secretes a chemical message for the purpose of cellular communication
a. muscle b. neuron c. keratinocyte d. fibroblast e. platelet
When a B cell first interacts with its particular antigen, the B cell
A) dies after destroying the antigen. B) engulfs the antigen and digests it. C) differentiates and develops into a clone of antibody-producing effector cells. D) alters the chemical configuration of the antigen.
Baculovirus genomes are 133.9 kb long and encode over 150 genes. This suggests that
A. their protein coats consist of very few types of protein subunits. B. their genetic material is DNA. C. they have a small host range. D. their protein structures are very complex. E. their genetic material is RNA.