Blog

Examination of a cell by transmission electron microscopy reveals a high density of ribosomes in the cytoplasm. This observation suggests that the cell is actively producing large amounts of which of the following molecules?

A series of enzymes catalyze the reactions in the metabolic pathway X → Y → Z → A. Product A binds to the enzyme that converts X to Y at a position remote from its active site. This binding decreases the activity of the enzyme. Based on its interaction with the enzyme that converts X to Y substance A is best described as ________.

Which of the following molecules is the final electron acceptor for electrons from photosystem I?

When chemical, transport, or mechanical work is performed by an organism, what happens to the heat that is generated?

Which of the following processes would be most directly affected if a thylakoid membrane is punctured so that the interior of the thylakoid is no longer separated from the stroma?

A series of enzymes catalyze the reactions in the metabolic pathway X → Y → Z → A. Product A binds to the enzyme that converts X to Y at a position remote from its active site. This binding decreases the activity of the enzyme. Based on its interaction with the enzyme that converts X to Y substance A is best described as ________.

The relationship between the breakdown of macromolecules and the biosynthesis of macromolecules is most similar to the relationship between which of the following pairs of terms?

Which of the following molecules is the final electron acceptor for electrons from photosystem I?

Which of the following terms best describes the forward reaction in the figure? Screen Shot 2020-10-25 at 3.12.33 PM.png

If homogenized cells are fractionated by differential centrifugation, which of the following organelles will require the greatest centrifugation speed to form a pellet at the bottom of the tube?