Which of the following is an example of a chemical barrier?
A) antimicrobial peptides
B) mucus
C) urine
D) skin
E) tears
Answer: A
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An agent that prevents the growth of bacteria without causing irreversible damage to the bacteria is referred to as ________.
Fill in the blank(s) with the appropriate word(s).
What field of science studies life's origin and distribution in the universe?
a. Geology b. Herpetology c. Biology d. Astrobiology e. Ornithology
Hemolytic disease of the newborn could result from which one of the following situations?
A) mother is Rh+; fetus is Rh- B) mother is Rh-; fetus is Rh+ C) mother is Rh+; fetus is Rh+ D) mother is Rh-; fetus is Rh-
Suppose that a man and woman have a son with a rare genetic disorder known to be X-linked. There is no occurrence of the disorder on the woman's side of the family, but the man's brother has it, as does her father. What is the probability that the son's defective allele came from the man?
a. 0% b. 25% c. 50% d. 100%