A region of prokaryotic DNA consisting of an operator, promoter, and coding sequence for several functionally related genes is called an ____
What will be an ideal response?
operon
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When a potassium ion (K+) moves from the soil into the vacuole of a cell on the surface of a root, it must pass through several cellular structures. Which of the following correctly describes the order in which these structures will be encountered by the
ion? A) plasma membrane ? primary cell wall ? cytoplasm ? vacuole B) secondary cell wall ? plasma membrane ? primary cell wall ? cytoplasm ? vacuole C) primary cell wall ? plasma membrane ? cytoplasm ? vacuole D) primary cell wall ? plasma membrane ? lysosome ? cytoplasm ? vacuole E) primary cell wall ? plasma membrane ? cytoplasm ? secondary cell wall ? vacuole
Which of the following is evidence for the connection between comets and meteor showers?
a. Meteor and comets have the same appearance in the sky. b. Meteor showers always occur when a comet is visible. c. Meteor showers always occur 6 months after a comet passes Earth. d. Meteor showers are an annual event. Many of these are known to be when the Earth crosses a comet's orbit.
A linear relationship between Vmax and enzyme concentration would be expected when
A) [S] << Km. B) [S] >> Km. C) [S] = Km. D) both [S] << Km and [S] = Km. E) both [S] >> Km and [S] = Km.
Which part of the digestive tract has the lowest pH?
A) Small intestine B) Stomach C) Rectum D) Large intestine E) Pancreas