Four of the five answers listed below possess
vascular tissue. Select the EXCEPTION.
a. grasses
b. mosses
c. conifers
d. ferns
e. ginkgos
B
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Organisms termed his- are considered prototrophic for histidine
Indicate whether this statement is true or false.
Answer the following statements true (T) or false (F)
1. All materials passing from one hyphal cell to another must diffuse across the septal wall. 2. Conidia are sexual spores produced by mushrooms. 3. Lichens are monophyletic. 4. Many kinds of ascomycetes and basidiomycetes have lost the ability to reproduce sexually.
Your research project involves the characterization of a particular signal transduction pathway. Specifically, you have been studying a receptor tyrosine kinase and protein X, which initiates downstream events. You are certain that protein X is part of the signal transduction pathway, but have been unable to identify a direct protein-protein interaction between the receptor tyrosine kinase and the protein X. What should you do next in your attempt to identify a link between the receptor tyrosine kinase and protein X?
A. try to identify an adapter protein that can interact with both the receptor and protein X B. try to identify proteins that act downstream of protein X C. confirm the interaction between the receptor tyrosine kinase and its ligand D. try to identify a coactivator protein
Which of the following virulence factors is specifically involved in helping an organism to physically spread throughout the body?
A) hyaluronidase B) endotoxins C) hemolysin D) siderophores