The detector of light during de-etiolation (greening) of a tomato plant is (are) _____
A) carotenoids
B) xanthophylls
C) phytochrome
D) auxin
C
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One way to kill a tree is to girdle it by cutting a groove a centimeter into the bark all around the trunk of the tree. The tree will typically survive that growing season, but will die over the winter. Which of the following is the best explanation for this observation?
A. The phloem was cut, so water and nutrients cannot be taken up to the leaves. B. The xylem was cut, so sugars cannot be transported to the roots. C. The phloem was cut, so sugars cannot be transported to the roots. D. The xylem was cut, so water and nutrients cannot be taken up to the leaves. E. The xylem was cut, which gives access to pathogens that kill the tree.
Which muscle contraction is involuntary?
A. Cardiac and smooth B. Skeletal only C. Cardiac, smooth, and skeletal D. Smooth only E. Cardiac only
Lipopolysaccharide (LPS) in the outer membrane of Gram-negative bacterial cells is an example of
A) An endotoxin B) An exotoxin C) A cytokine D) An endonuclease
The monomorphic fungus Rhizopus is a(n)
A) common bread mold. B) toxic mushroom. C) opportunistic pathogen. D) true pathogen. E) common bread mold and an opportunistic pathogen.