For threshold traits, the liability for a genetic disorder is distributed among individuals in a bell-shaped curve
a. True
b. False
True
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Organisms that aerobically catabolize methane use the intermediate ________ for biosynthesis and produce ________ when oxidizing the substrate for energy
A) CH2O (formaldehyde) / CO B) CH2O (formaldehyde) / CO2 C) HCOO? (formate) / CO D) HCOO? (formate) / CO2
A class of pathogen recognition receptors that function exclusively as signaling receptors are known as the ________ receptors.
Fill in the blank(s) with the appropriate word(s).
Homo erectus:a
was shorter than Homo habilis. b. had a larger brain than Homo habilis. c. had more pronounced sexual dimorphism than Homo habilis. d. was the first member of the genus Homo without pronounced supraorbital ridges. e. did not use tools.
A child may be given the vaccine for chickenpox. If the child goes to school and plays with other children who have the chickenpox virus, the vaccinated child will not get sick. Why is this?
A) Vaccines act like antibiotics so that any organism in the body will be destroyed before the immune system has to respond. B) Vaccines introduce a friendly virus into cells so they cannot be infected with a second virus. C) Vaccines produce a primary response in which memory cells are generated that respond rapidly in a second exposure. D) Vaccines stimulate macrophages to work extra hard to fight infections.