The primary difference between enhancers and promoter-proximal elements is that enhancers _____
A) are transcription factors; promoter-proximal elements are DNA sequences
B) enhance transcription; promoter-proximal elements inhibit transcription
C) are at considerable distances from the promoter; promoter-proximal elements are close to the promoter
D) are DNA sequences; promoter-proximal elements are proteins
C
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The class of macromolecules that are primarily responsible for catabolic and anabolic activities in a cell are the
A. nucleic acids B. proteins C. lipids D. carbohydrates
A nutrient medium that contains at least one ingredient that is not chemically defined is termed ________.
A. complex B. enriched C. synthetic D. reducing
Which of the following is not a normal portal of exit of an infectious disease?
A. Skin B. Coughing and sneezing C. Urogenital tract and feces D. Removal of blood E. All of these are normal exit portals.
What is the node of a plant stem?
A) the point of leaf attachment B) the point of apical dominance C) the area between the shoots and the roots D) a small pore where gases are exchanged