The multi-level grouping of individual organisms is a means of
A. classification.
B. identification.
C. reduction.
D. minimization.
Answer: A
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The cell-mediated immune response is brought about by which cells?
A. B cells B. T cells C. erythrocytes D. fibroblasts E. lysozymes
A sarcomere shortens when _____
a. thick filaments shorten c. both thick and thin filaments shorten b. thin filaments shorten d. none of these
Following damage to his heart, Jim is having a pacemaker implanted. Which one of the following components of the heart does this device replace the activity of?
A) atrioventricular node B) sinoatrial valve C) atrioventricular bundle D) Purkinje fibers E) sinoatrial node
One hypothesis for why we age, or at least why our cells age, is that every time that mitosis occurs, ________ at the ends of chromosomes shorten, and eventually the cell runs out of these units at the ends of chromosomes
Fill in the blank(s) with correct word