Consider the following case. At a ranch, a horse is infected with Eastern equine encephalitis virus. A mosquito bit the animal, was contaminated with the virus, and proceeded to bite and infect a ranch hand. The horse is slaughtered and its meat is consumed by the ranch hands at a cookout. Which was the vector?
A. Mosquito
B. Ranch hands at the cookout
C. Bitten ranch hand
D. Virus
E. Horse
Answer: A. Mosquito
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What will be an ideal response?
At one point in human development, tissue connects the fingers and the hand, giving the hand a
“webbed” appearance. Enzymes eventually destroy the cells of the webbing and the fingers separate. These enzymes are probably liberated from the
a. chormosomes. b. smooth endoplasmic reticulum. c. lysosomes. d. nucleus. e. vacuoles.
Hormones are synthesized from cholesterol are part of the ____ group of hormones
a. fatty acid derivatives b. steroid hormones c. amino acid derivatives d. peptide hormones e. protein hormones
The necessary substances that a cell can't make on its own are called
A) carbohydrates. B) nitrogenous bases. C) vitamins. D) growth factors. E) amino acids.