Answer the following questions true (T) or false (F)
1. All autoimmune diseases have a genetic cause.
2. Clostridium perfringens may cause necrotizing fasciitis.
3. M protein is an antiphagocytic factor produced by Streptococcus pyogenes.
1. FALSE
2. TRUE
3. TRUE
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Signal amplification relies on:
A. increasing amounts of ligand as signal transduction proceeds. B. a sequential increase in the different components of the signal transduction pathway. C. increasing numbers of cell-surface receptors as the signal is transduced. D. increased activity of protein phosphatases.
Vacuoles for ingesting food and regulating their water balance are characteristic of
A. sporozoans. B. trypanosomes. C. ciliates. D. algae. E. spirochetes.
Heterospory occurs in
a. some seedless vascular plants b. bryophytes c. gymnosperms and angiosperms d. a and c e. a, b, and c
Only ______ cells can go through meiosis
Fill in the blank(s) with the appropriate word(s).