How many letters are in the RNA "alphabet" of the genetic code?
a. 4
b. 5
c. 20
d. 64
Ans: a. 4
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The predatory bacterium Bdellovibrio bacteriophorus drills into a prey bacterium and, once inside, digests it. In an attack upon a Gram-negative bacterium that has a slimy cell covering,
what is the correct sequence of structures penetrated by B. bacteriophorus on its way to the prey's cytoplasm? 1. membrane composed mostly of lipopolysaccharide 2. membrane composed mostly of phospholipids 3. peptidoglycan 4. capsule A) 2, 4, 3, 1 B) 1, 3, 4, 2 C) 1, 4, 3, 2 D) 4, 1, 3, 2
Division and differentiation of ground meristem gives rise to ____.
A. ground tissue B. vascular tissue C. dermal tissue D. protoderm E. procambium
An arrangement of microtubules located in the matrix of cilia and flagella is called the ________.
A. axial filament B. axial bundle C. axillary tubule D. axoneme
Which of the following is not part of the process by which an endospore transforms to become a vegetative cell?
A. Outgrowth B. Activation C. Induction D. Germination