A characteristic of all cancers is that ____
a. the cells divide continuously
b. they have a benign form and a deadly form
c. several mutations in several different genes are required in order for cancer to develop
d. they are always due to a chromosome disjunction mutation
e. the rapid proliferation of cells is required
a
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Which of the following relationships between groups is correct? Select all that apply
A. cephalopod are a group of annelid B. crustaceans are a group of arthropods C. insects are a group of hemichordates D. sea stars are a group of echinoderms E. tunicates are a group of chordates
The defining characteristic of a stem cell is
A) self-repair. B) self-renewal. C) the ability to turn into a cancer cell. D) its origin from a progenitor cell.
Four of the five answers listed below are located within the spinal cord. Select the exception
a. dorsal root ganglion b. interneurons between sensory input and motor outputs c. major ascending and descending nerve tracts d. interneurons connecting with other neurons e. direct reflex connections between sensory and motor neurons
Each nucleus in a human somatic cell contains ________ chromosomes
Fill in the blank(s) with correct word