The bacterial A-B toxins often consist of a two-chain molecule. The 'B chain' promotes entry of the bacteria into cells, and the 'A chain' has inhibitory activity against some vital function.

a. true
b. false


Ans: a. true

Biology & Microbiology

You might also like to view...

Except that they are not produced in the cytoplasm, conidia produced by Streptomyces spp. are chemically quite similar in composition to endospores produced by Bacillus spp

Indicate whether the statement is true or false.

Biology & Microbiology

CDKs are protein kinases. They function to ____

a. add phosphate groups to target proteins b. check for the attachment of spindle fibers to chromosomes c. remove phosphate groups from cyclins d. arrest the cell cycle e. allow the cell cycle to work forward or backward

Biology & Microbiology

The sodium-potassium pump catalyzes

Up to 25% of a cell's ATP is used to run sodium-potassium pumps. Without the resulting sodium and potassium gradients, neurons and muscles cannot fire properly. A. equilibrium. B. facilitated diffusion. C. osmosis. D. active transport. E. diffusion.

Biology & Microbiology

All the bacteria classified within the genus Bacillus are capable of forming endospores.

a. true b. false

Biology & Microbiology