What is a zoonosis?
A. A disease caused by normal human microbiota from the respiratory tract
B. A disease caused by changes in the balance between normal microbiota
C. A disease that spreads naturally from animals to humans
D. A disease caused by normal microbiota entering a body site where they do not normally occur
C. A disease that spreads naturally from animals to humans
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Which type of mutation substitutes one amino acid for another?
A) nonsense B) missense C) sense D) antisense
Elephantiasis is caused by damage of valves that affect the flow of:
a. intestinal contents b. lymph c. blood d. urine e. cerebrospinal fluid
What enzymes are used to cut DNA molecules? How do they work?
What will be an ideal response?
An example of an animal that has a nerve net of interconnected neurons instead of a brain is a(n) ____
a. planarian b. earthworm c. grasshopper d. sea anemone e. squid