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

Biology & Microbiology

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The principal mode of transmission of rabies is through

A. blood. B. fomites. C. saliva. D. pus.

Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology