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
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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.
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
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.
All the bacteria classified within the genus Bacillus are capable of forming endospores.
a. true b. false