In Bacillus anthracis the lethal factor
A. a protease that inhibits blood clotting
B. a metalloprotease that lead to cell death
C. binds to cells
D. is an adenylate cyclase
Answer: B. a metalloprotease that lead to cell death
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Choose the statement that is true about DNA.
A. It forms a double helix. B. It is a polymer of nucleotides. C. It exhibits base pairing. D. All of these are correct.
Pus, a thick white substance that sometimes accumulates at the site of an infection, is a mixture of dead bacteria, debris, and white blood cells
Indicate whether the statement is true or false
Which of the following proteins allow a plant to mount an immune response against a specific pathogen? Select all correct choices
A. flagellin receptors on the plasma membrane B. avirulence (AVR) proteins formed by pathogens C. resistance (R) proteins in the plant cytoplasm D. chitin receptors on the plasma membrane
Mutations are more likely to occur in repeated DNA sequences because
A) these bases are unstable. B) bases in the strand can form base pairs, generating loops that interfere with replication and repair enzymes. C) the repeats hold onto the replication enzymes, causing base mismatches. D) the repeats attract and bind to mutagens, increasing the mutation rate.