The physical barrier of the skin and the mucus produced by the epithelial cells lining body cavities ____
a. activate the complement system
b. release histamines
c. facilitate the production of antibodies
d. comprise the innate immune system
e. protect the body from infection by pathogens
e
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In humans, ability to roll the tongue (R) is dominant to being unable to roll (r). Having freckles (F) is dominant to having no freckles (f). A man heterozygous for both traits marries a woman heterozygous for both traits
What is the probability that they will have a child with freckles? A. 9/16 B. 3/16 C. 1/16 D. 3/4 E. 1/4
A parasitic disease known as Schistosomiasis is caused by several species of flatworms in the
phylum Platyhelminthes. The life cycle includes an aquatic snail where the larvae develop; these larvae then hatch into the water and swim around until they find the appropriate vertebrate host. Adult males and females reproduce sexually in the vertebrate host, and eggs are usually shed into water via feces or urine. The snail would be considered a(n) __________.
a. intermediate host b. vector c. primary host d. cyst
Insulin is synthesized in (A)____, and reduces (B)____ levels in the bloodstream.
a. (A) B cells (liver) (B) fatty acid b. (A)B cells (pancreas) (B) glucose c. (A) A cell (liver) (B) fatty acid d. (A) Acell (pancreas) (B) glucose
Which of the following diseases is currently vaccine-preventable in humans?
A) schistosomiasis B) malaria C) Lyme disease D) plague E) yellow fever