All of the following are mechanical/physical defense mechanisms EXCEPT:
a. tears
b. mucus
c. stomach acid
d. urine
Answer: c. stomach acid
You might also like to view...
Organisms that are found together and interact on a more or less permanent basis are in a relationship termed
A. mutualism. B. parasitism. C. symbiosis. D. transient microbiota.
L-lysine is an essential amino acid and must be supplied in the diet. By comparison, the stereoisomer D-lysine is not biologically active. Why can your body only utilize one form?
A. Antibodies recognize the D form and destroy it before your body can use it for nutritional purposes. B. Since the L form and D form are chiral molecules, they will bind together and inhibit utilization of the D form. C. Enzymes can only recognize a single, specific stereoisomer. D. Since the L form and D form are enantiomers, they will bind together and inhibit utilization of the D form.
The location where a disease-causing organism is normally found is called the ________.
Fill in the blank(s) with the appropriate word(s).
In many mammalian species, including bats and most non-human primates, a bone in the penis, called
the ____, helps to maintain it in an erect state.
a. pendulum b. baculum c. colostrum d. gametogonium e. marsupium