You have a substance and begin a set of experiments in which you break it down into other substances through chemical reactions. After a few successive reactions, you discover a set of products that can't be broken down further, no matter what type of
chemical reaction you attempt. These substances are:
A) elements. B) neutrons. C) isotopes. D) protons. E) electrons.
Answer: A
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The principal mode of transmission of rabies is through
A. blood. B. fomites. C. saliva. D. pus.
Plants using the C4 photosynthetic pathway
A) use rubisco to catalyze the reaction between O2 and RuBP. B) have a lower rate of photosynthesis than plants using the C3 photosynthetic pathway. C) divide photosynthesis between mesophyll and bundle sheath cells. D) are mostly trees.
The cell-cell interactions mediated by the selectins, integrins, and most members of the Ig superfamily are _______ interactions in which the cytoskeletons of adjacent cells are not linked to one another.
a. nonspecific b. physiologically unimportant c. stable d. transient
Immune cells that secrete cytokines and activate other immune cells are:
a. Virally infected cells b. Helper T-cells c. Invading pathogenic bacteria d. Cytotoxic T-cells e. Abnormal body cells