In a phylogenetic tree, positions indicating a common ancestor are referred to as:
A. branches B. nodes
C. trunks
D. roots
E. limbs
Answer: B
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How much of any radioisotope remains after
two of its half-lives have passed?
a. 1.25% b. 2.5% c. 5% d. 10% e. 20%
Creutzfeldt-Jakob disease is caused by a
1.bacteria. 2.retrovirus. 3.bacteriophage. 4.viroid. 5.prion.
The gray matter of the brain is associated with the
a. cerebral cortex. b. pons. c. optic chiasm. d. corpus callosum. e. thalamus.
Most allergy medicines contain antihistamines that block the actions of histamine. These drugs reduce cold symptoms by directly
A. stimulating components of the immune system through the release of cytokines. B. stimulating the production of specific antibodies. C. blocking or reducing the inflammation response in mucous membranes. D. recruiting macrophages to the nasal epithelium. E. lysing virus-infected cells and preventing further propagation of the pathogen.