What makes an organism a prokaryote?
A) Prokaryotes lack membrane bound organelles.
B) They have plasma membranes to protect them from their surrounding environment.
C) They contain DNA and ribosomes within the cell.
D) It's cellular components are found within cytoplasm.
Ans: A) Prokaryotes lack membrane bound organelles.
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According to the acid-growth hypothesis, auxin causes increased acidity in cell walls, which then
activates ____ that disrupt(s) bonds between cellulose microfibrils, allowing cell expansion.
a. a membrane potential b. AUX1 transporters c. proteins called expansins d. an mRNA e. K+ ions
Members of the genus Pseudomonas ________.
A. are obligate intracellular parasites B. perform anaerobic photosynthesis C. are aerobes that mineralize a wide variety of organic compounds D. form cysts when starved for nutrients
RNA splicing removes ________________________ from the mRNA while keeping the __________________.
Fill in the blank(s) with the appropriate word(s).
The mechanism of action of erythromycin is
A) inhibition of protein synthesis. B) inhibition of cell wall synthesis. C) inhibition of nucleic acid synthesis. D) inhibition of a metabolic pathway. E) disruption of cytoplasmic membranes.