The scientist that contributed most to the development of pure culture techniques was
A. Alexander Fleming.
B. Louis Pasteur.
C. Edward Jenner.
D. Robert Koch.
D
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Dr. Edward Jenner realized that cows have a disease called cowpox, which is like a disease that infects humans called smallpox; Jenner noticed that milkmaids whose hands were infected with cowpox were not contracting smallpox. Jenner infected a child with the pus from a cowpox blister, and found that the child did not contract smallpox. Which statement represents a supporting hypothesis?
A. The cowpox virus prevented the small pox virus from entering the child's immune system. B. the smallpox virus was so similar to the cowpox virus that the child's immune system ignored the smallpox virus C. The cowpox infection will prevent the child from being infected by the small pox virus. D. The cowpox infection will have no effect on the child's immunity to the small pox virus.
________ is the ability to distinguish two objects that are close together as separate. When using a light microscope, this ability is determined by ________.
Fill in the blank(s) with the appropriate word(s).
Facilitated diffusion requires
What will be an ideal response?
The secretion of which hormone decreases when calcium blood levels increase?
a. calcitonin b. parathyroid hormone c. thyroid hormone d. epinephrine e. norepinephrine