The most prominent known role in the opening and closing of stomata is played by____ ions
a. Ca2+
b. Cl?
c. K+
d. NH4+
e. Na+
ANSWER: c
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The potential seventh mass extinction refers to ____
a. the loss of 50% of species on Earth, including dinosaurs, at the end of the Cretaceous b. the most extensive loss of species that occurred during the Permian c. what will happen to the human species if a nuclear war occurs d. the rapid loss of biodiversity due to human degradation of the environment e. events that occurred just before insects diversified on land
If you administered an acetylcholine-destroying drug directly into the brain of a rat, this might lead to mimicking symptoms of
A. epilepsy. B. insomnia. C. Parkinson's disease. D. Huntington's disease. E. Alzheimer's disease.
The secondary level of protein structure involves
A. folding of the primary structure upon itself. B. the number of peptide bonds in a polypeptide chain. C. substitutions in the amino acid sequence. D. interactions with other polypeptide chains. E. none of these.
Which of the following is an agranulocyte?
A) basophil cell B) eosinophil cell C) neutrophil cell D) mast cell E) dendritic cell