What protective substance(s) of the skin is/are capable of breaking down the cell walls of certain bacteria?
a) Perspiration
b) Antimicrobial peptides
c) Sebum
d) Lysozyme
Ans: d) Lysozyme
Biology & Microbiology
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One of the major categories of receptors in the plasma membrane reacts by forming dimers, adding phosphate groups, and then activating relay proteins. Which type does this?
A) G protein-coupled receptors B) ligand-gated ion channels C) steroid receptors D) receptor tyrosine kinases
Biology & Microbiology
You have blood type O and need a transfusion. Which donor would be best?
a. type O b. type AB c. type B d. type A
Biology & Microbiology
Nearly all of life’s chemistry occurs near
which of the following pHs?
a. 1 b. 3 c. 5 d. 7 e. 9
Biology & Microbiology
How does the volume of a solid , insoluble object submerged in a fluid compare to the volume of the fluid displaced
What will be an ideal response?
Biology & Microbiology