Smoking damages the respiratory tract and can cause bronchitis, emphysema, and cancer.
a. true
b. false
Answer: a. true
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The covalent bonds connecting monomer units in sugars can be formed by the removal of a water molecule. This reaction is referred to as:
A. a hydrolysis reaction. B. an oxidation-reduction reaction. C. a dehydration reaction. D. a hydration reaction.
Artemia and Fast Plant™ bioassays can be used to identify
(a) cytotoxins. (b) herbicides. (c) plant growth stimulators. (d) all of the above.
In the accompanying figure, why does the curve sharply drop after approximately 45°C instead of mirroring the slope
of the line going from 0-40°C?
a. At high temperatures, the reactions proceed so quickly that enzymes are no longer helpful or required. b. This is true of all catalysts and is not due to any special features of enzymes.
c. The kinetic energy of the reactants is so great that it destabilizes the enzyme and diminishes the enzyme's activity. d. The kinetic energy of the reactants is lower than that of the products, forcing a change in enzyme activity. e. The enzyme begins to denature above a certain temperature, eliminating all catalytic activity of the protein.
In Arabidopsis, FLD (a deacetylase enzyme) stimulates flowering. Which of the following statements is TRUE?
A. FLD deacetylates histones that bind to the FLC gene, causing repression of FLC transcription. B. FLD deacetylates histones that bind to regions of the FLC gene and stimulates its transcription. C. FLD causes repression of FLC translation. D. FLD deacetylates histones surrounding the FLD gene, causing suppression of FLD transcription.