Roots obtain cations through cation exchange, where soil particles absorb ____ provided directly or indirectly by the root, and thus release cations.
a. Clb.
b. K+
c. H+
d. water
e. CO2
ANSWER: c
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During a chemical reaction, atoms are ________.
A. rearranged B. created C. destroyed D. destroyed and created
Which of the following is NOT an organic molecule?
A) Nucleic acid B) Lipid C) Protein D) Carbon monoxide E) Monosaccharide
A region that has grasses as the dominant vegetation form, widely spaced trees, a short wet season, and a pronounced dry season is a ________
Fill in the blank(s) with correct word
Botulinum toxin- A toxin produced by the bacterium Clostridium botulinum.Known for sometimes lethal poisoning from infected meat products. In modern controlled medical or cosmetic use, the very same toxin is known as Botox.Tetanus toxin- Another very potent neurotoxin produced by Clostridium tetani.Strichnine- A highly poisonous alkaloid produced by the Strychnos nux-vomica tree,historically used to kill rats and other pests.You accidentally consume botulinum toxin by eating a contaminated can of sausages. What do you predict will be the most harmful physiological effect?
A. Pupil dilation B. Respiratory failure due to flaccid paralysis (relaxed muscles) C. Slowed action potential conduction D. Respiratory failure due to spastic paralysis (constant muscle contraction)