Twins are said to be concordant for a trait when
A. both twins exhibit the trait.
B. only identical twins exhibit the trait.
C. only fraternal twins exhibit the trait.
D. fraternal twins more often show the trait than identical twins.
E. None of these is true.
A
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The Ecdysozoa include (select all that apply)
A. annelid worms B. mollulsks C. sea anemones D. arthropods E. vertebrates
Calcium levels in the body are maintained by hormones. If the blood calcium level rises above a set point, calcitonin is secreted by the thyroid gland and sets into motion responses to lower the blood calcium back to the set point
If the blood calcium level falls below a set point, the parathyroid gland secretes parathyroid hormone that sets into motion responses to raise the blood calcium. These homeostatic responses are examples of A) positive feedback. B) effectors. C) sensors. D) negative feedback.
You are working in the lab and want to use a microscope to examine the fimbriae of a bacterium at the highest magnification possible. You should use a scanning microscope.
a. true b. false
What cells produce antibodies?
A. B/Plasma cells B. Dendritic Cells C. Fibroblasts D. Neutrophils E. T cells