The movement of substances from lower to higher concentration across a semipermeable membrane via a specific protein carrier and cell expenditure of energy is called ________.
A. active transport
B. endocytosis
C. facilitated diffusion
D. diffusion
E. osmosis
Answer: A
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Disorders of which organelle are often associated with defects in transport from compartment to compartment, resulting in poor sorting of protein components within the cell?
A. plasma membrane B. plasmids C. endoplasmic reticulum D. Golgi apparatus E. nucleus
Suppose a living plant cell has ? = ?S = ?0.5 MPa. If the plant cell is placed into a beaker filled with a solution with
? = 0, then the cell should ____.
a. take up water until it bursts b. lose water until its ? = ? of the solution c. take up water until within the cell ?P = ? d. take up water until its ? = ?S of the solution e. lose water until its ?S = its ?P
Which of the following is a native protein isolated from bacteria and used to soften cotton fibers in jeans and other clothes?
A) Cellulase B) Amylase C) Chymosin D) Penicillin E) Polymerase
In a chemical reaction, glyceraldehyde-3-phosphate + NAD+ yields 1,3-bisphosphoglycerate + NADH. In this reaction, what happened to NAD+?
A. It was activated to form NADH B. It was oxidized to form NADH C. It was reduced to form NADH D. it served as an enzyme to catalyze the reaction, and at the end of the reaction formed NADH