Which of the following transporters does not use passive transport to move molecules across a membrane?
a. GLUT-1 glucose transporter
b. Gramicidin ion channel
c. Sodium-potassium pump
d. Valinomycin
Ans: c. Sodium-potassium pump
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A ribozyme is
A) an RNA-protein complex that cleaves DNA. B) an enzyme that catalyzes the assembly of ribosomes. C) an RNA that can catalyze a specific chemical reaction. D) a stretch of uracil in RNA that directs splicing.
A thin layer chromatogram is useful for
a. measuring the amount of photosynthesis. b. determining the amount of gas produced during photosynthesis. c. separating pigments based on their physical characteristics. d. determining the presence of sugars in a leaf.
Undifferentiated cells that can divide and specialize to form a variety of different cells are called:a
differential cells. b. mother cells. c. determinate cells. d. stem cells. e. morphogens
Mechanical removal of most microbes from living or inanimate surfaces
A. Sterilization B. Disinfection C. Decontamination D. Antisepsis