A pyrimidine is a double-ring molecule

__________________ Indicate whether the statement is true or false.


False - single

Biology & Microbiology

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Noncompetitive inhibition is best described as

A. the end product binding to enzyme in noncompetitive site. B. the substrate binding to enzyme in a regulatory site. C. an anabolic reaction. D. the substrate binding to DNA, blocking enzyme transcription. E. the end product binding to DNA, blocking enzyme transcription.

Biology & Microbiology

The distance between the crests of two successive waves of light is known as the ____

a. wave frequency b. wave period c. wave distance d. wavelength e. wave space

Biology & Microbiology

As temperatures in the Arctic rise, which of the following changes may occur?

A. Tundra will be replaced by taiga. B. Taiga will be replaced by tundra. C. Temperate forest will be replaced by taiga. D. Tundra will be replaced by desert. E. Taiga will be replaced by temperate rain forest.

Biology & Microbiology

Which of the following is an energy-requiring mode of transport that brings substances into a cell?

A) Osmosis B) Simple diffusion C) Active transport D) Facilitated diffusion

Biology & Microbiology