What stimulus triggered by the binding of acetylcholine then activates nitric oxide synthase?
a) cellular hyperpolarization
b) a rise in cytoplasmic Ca2+ concentration
c) a drop in cytoplasmic Ca2+ concentration
d) release of cGMP
e) an action poential
Ans: b) a rise in cytoplasmic Ca2+ concentration
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In Gram-stained preparations, M. atlantae will appear as:
a. either gram-negative coccobacilli or short, broad rods that tend to resist decoloriza-tion and may appear gram-variable. b. gram-negative cocci in pairs or short chains. c. coccobacilli or medium-sized rods. d. coccobacilli that may appear in chains.
If you looked at an electron microscope picture of a true bacterium and an archaebacterium, you probably couldn't tell which was which. Yet they are classified into separate kingdoms, and more recently, in separate domains. In what ways are these organisms fundamentally different?
What will be an ideal response?
The genotype Ff is an example of a:
A) monohybrid genotype. B) heterozygous genotype. C) trait controlled by multiple genes. D) dihybrid genotype. E) homozygous genotype.
Which of the following best describes the stomach's role in absorption?
A) The stomach absorbs most nutrients. B) The stomach absorbs acids. C) The stomach absorbs some drugs and alcohol but few nutrients. D) The stomach absorbs mostly large proteins.