Reddish-purple coloring of leaves, especially along the margins of young leaves, is a typical symptom of deficiency of which element?
A) C
B) Mg2+
C) N
D) P
E) K+
Answer: D
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Major classes of macromolecules present in all living microorganisms include
A) amino acids, carbohydrates, lipids, and nucleic acids. B) cell wall, cytoplasmic membrane, nucleoid, and ribosomes. C) genes, proteins, and vitamins. D) inorganic and organic compounds.
As a visitor to a country in which cholera is an endemic disease, what specific steps would you take to reduce your risk of cholera exposure? Will these precautions also prevent you from contracting other waterborne diseases? If so, which ones?
Identify waterborne diseases for which your precautions may not prevent infection. What will be an ideal response?
The stage of development that involves cell division without cell growth is
A. Fertilization B. Cleavage C. Neurulation D. Gastrulation E. Organogenesis
What is lost when acetyl-CoA enters into the Krebs cycle?
a. pyruvate b. coenzyme A c. fructose bisphosphate d. oxaloacetate e. citrate