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

Biology & Microbiology

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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.

Biology & Microbiology

Vacuoles for ingesting food and regulating their water balance are characteristic of 

A. sporozoans. B. trypanosomes. C. ciliates. D. algae. E. spirochetes.

Biology & Microbiology

Heterospory occurs in

a. some seedless vascular plants b. bryophytes c. gymnosperms and angiosperms d. a and c e. a, b, and c

Biology & Microbiology

Only ______ cells can go through meiosis

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology